Fattening of turbot (Scophthalmus maximus) in Stolt Sea Farm. Quilmas Farm
Authorship
L.M.A.L.
Master in Aquaculture
L.M.A.L.
Master in Aquaculture
Defense date
02.11.2025 12:00
02.11.2025 12:00
Summary
The production of turbot in Galicia has become a key industry and a source of employment, highlighting the role of companies such as Stolt Sea Farm. This Master Thesisintroduces the production process of turbot, as well as the organizational structure and facilities that the Quilmas plant has to achieve efficient production. The functions of the welfare department are further developed, focusing on the health control of the farm and the main pathologies affecting it. The tasks of the production department are also described, with special emphasis on food management and population density control.
The production of turbot in Galicia has become a key industry and a source of employment, highlighting the role of companies such as Stolt Sea Farm. This Master Thesisintroduces the production process of turbot, as well as the organizational structure and facilities that the Quilmas plant has to achieve efficient production. The functions of the welfare department are further developed, focusing on the health control of the farm and the main pathologies affecting it. The tasks of the production department are also described, with special emphasis on food management and population density control.
Direction
BANDIN MATOS, MARIA ISABEL (Tutorships)
Castaño Varela, Iria (Co-tutorships)
BANDIN MATOS, MARIA ISABEL (Tutorships)
Castaño Varela, Iria (Co-tutorships)
Court
LAMAS FERNANDEZ, JESUS (Chairman)
MAGARIÑOS FERRO, BEATRIZ (Secretary)
SANTOS RODRIGUEZ, MARIA ISABEL (Member)
LAMAS FERNANDEZ, JESUS (Chairman)
MAGARIÑOS FERRO, BEATRIZ (Secretary)
SANTOS RODRIGUEZ, MARIA ISABEL (Member)
Study of the seasonal trophic dynamics of mesozooplankton in a coastal upwelling ecosystem (A Coruña Estuary) using stable isotopes in bulk and amino acids
Authorship
C.A.S.
Master in Marine Biology
C.A.S.
Master in Marine Biology
Defense date
06.27.2025 10:00
06.27.2025 10:00
Summary
This study analyzes the trophic ecology of the mesozooplankton community in the Ría de A Coruña, a coastal area strongly influenced by seasonal upwelling. Through stable isotopes and compound-specific isotope analysis of individual amino acids (CSIA-AA), trophic positions (TPGlx and TPAla) of mesozooplankton were estimated, allowing for the differentiation between classical (herbivory-based) trophic pathways and those involving the microbial loop. Environmental and meteorological data (temperature, salinity, nutrients, chlorophyll a, and upwelling index) from monthly samplings in the years 1995, 2004, 2015, and 2021 were integrated into the analysis. The results show seasonal variability in trophic positions: lower values during upwelling periods indicate the dominance of herbivory over other trophic strategies, while higher values in winter reflect increased trophic complexity and microbial influence. Correlation analyses and PCA revealed that this seasonal variation in mesozooplankton TP was primarily driven by environmental variability associated with upwelling (notably temperature, chlorophyll a, and dissolved nutrient concentrations). This study demonstrates that the use of CSIA-AA, combined with environmental variable analysis, is an effective tool for more accurately estimating trophic structure in pelagic ecosystems that are highly dynamic due to upwelling events, which directly impact the base of the food web and, consequently, ecosystem functionality.
This study analyzes the trophic ecology of the mesozooplankton community in the Ría de A Coruña, a coastal area strongly influenced by seasonal upwelling. Through stable isotopes and compound-specific isotope analysis of individual amino acids (CSIA-AA), trophic positions (TPGlx and TPAla) of mesozooplankton were estimated, allowing for the differentiation between classical (herbivory-based) trophic pathways and those involving the microbial loop. Environmental and meteorological data (temperature, salinity, nutrients, chlorophyll a, and upwelling index) from monthly samplings in the years 1995, 2004, 2015, and 2021 were integrated into the analysis. The results show seasonal variability in trophic positions: lower values during upwelling periods indicate the dominance of herbivory over other trophic strategies, while higher values in winter reflect increased trophic complexity and microbial influence. Correlation analyses and PCA revealed that this seasonal variation in mesozooplankton TP was primarily driven by environmental variability associated with upwelling (notably temperature, chlorophyll a, and dissolved nutrient concentrations). This study demonstrates that the use of CSIA-AA, combined with environmental variable analysis, is an effective tool for more accurately estimating trophic structure in pelagic ecosystems that are highly dynamic due to upwelling events, which directly impact the base of the food web and, consequently, ecosystem functionality.
Direction
DOMINGUEZ CONDE, JESUS (Tutorships)
Viana González, Inés (Co-tutorships)
Rodríguez Ramos, Tamara (Co-tutorships)
DOMINGUEZ CONDE, JESUS (Tutorships)
Viana González, Inés (Co-tutorships)
Rodríguez Ramos, Tamara (Co-tutorships)
Court
BESTEIRO RODRIGUEZ, MARIA CELIA (Chairman)
BALBOA MENDEZ, SABELA (Secretary)
Rodriguez Diaz, Miguel Angel (Member)
BESTEIRO RODRIGUEZ, MARIA CELIA (Chairman)
BALBOA MENDEZ, SABELA (Secretary)
Rodriguez Diaz, Miguel Angel (Member)
Turbot fattening (Scophthalmus maximus) at Stolt Sea Farm. Lira farming plant.
Authorship
A.B.F.
Master in Aquaculture
A.B.F.
Master in Aquaculture
Defense date
02.11.2025 12:00
02.11.2025 12:00
Summary
This master’s thesis describes the activities carried out during my traineeship at the Lira turbot (Carnota) aquaculture plant, owned by the Stolt Sea Farm. An introduction is included on the current status of aquaculture and the importance of the culture of turbot (Scophthalmus maximus). In addition, the facilities and organization of the farm are described, as well as the main pathologies detected in the plant. The tasks performed in the Welfare and Production departments are detailed, highlighting the importance of health control and efficient management of food to ensure optimal crop development and improve productive results.
This master’s thesis describes the activities carried out during my traineeship at the Lira turbot (Carnota) aquaculture plant, owned by the Stolt Sea Farm. An introduction is included on the current status of aquaculture and the importance of the culture of turbot (Scophthalmus maximus). In addition, the facilities and organization of the farm are described, as well as the main pathologies detected in the plant. The tasks performed in the Welfare and Production departments are detailed, highlighting the importance of health control and efficient management of food to ensure optimal crop development and improve productive results.
Direction
BANDIN MATOS, MARIA ISABEL (Tutorships)
Castaño Varela, Iria (Co-tutorships)
BANDIN MATOS, MARIA ISABEL (Tutorships)
Castaño Varela, Iria (Co-tutorships)
Court
LAMAS FERNANDEZ, JESUS (Chairman)
MAGARIÑOS FERRO, BEATRIZ (Secretary)
SANTOS RODRIGUEZ, MARIA ISABEL (Member)
LAMAS FERNANDEZ, JESUS (Chairman)
MAGARIÑOS FERRO, BEATRIZ (Secretary)
SANTOS RODRIGUEZ, MARIA ISABEL (Member)
Relationship of Norway lobster (Nephrops norvegicus) density with sediment characteristics on the Galician continental shelf
Authorship
M.B.G.
Master in Marine Biology
M.B.G.
Master in Marine Biology
Defense date
02.25.2025 10:00
02.25.2025 10:00
Summary
The Norway lobster, Nephrops norvegicus (Linnaeus, 1758) is a species of great commercial interest with a long tradition of exploitation in Galician waters that has experienced a great decline in recent decades. These organisms have a very limited capacity for movement, living in burrows dug in the sediment which its nature being one of the parameters that determine their presence by conditioning the construction of these structures. The following work seeks to analyse the relationship between the population density of the Norway lobster in Galicia (subdivided into two sections (north and south) differentiated by the 43rd parallel north), the percentage of fine sediment fraction (sampled using two methods: collector and dredge) and other abiotic parameters. It has been found that the presence and abundance of the Norway lobster in the north and south is conditioned by the percentage of silt and clay. Furthermore, a dome-type relationship has been observed between the abundance of Norway lobsters and the percentage of the fine fraction in the northern area sampled by collector, while in the southern area this relationship is less evident. In addition, a non-linear relationship with depth and a marked decline over time in Norway lobster’s abundance have been observed.
The Norway lobster, Nephrops norvegicus (Linnaeus, 1758) is a species of great commercial interest with a long tradition of exploitation in Galician waters that has experienced a great decline in recent decades. These organisms have a very limited capacity for movement, living in burrows dug in the sediment which its nature being one of the parameters that determine their presence by conditioning the construction of these structures. The following work seeks to analyse the relationship between the population density of the Norway lobster in Galicia (subdivided into two sections (north and south) differentiated by the 43rd parallel north), the percentage of fine sediment fraction (sampled using two methods: collector and dredge) and other abiotic parameters. It has been found that the presence and abundance of the Norway lobster in the north and south is conditioned by the percentage of silt and clay. Furthermore, a dome-type relationship has been observed between the abundance of Norway lobsters and the percentage of the fine fraction in the northern area sampled by collector, while in the southern area this relationship is less evident. In addition, a non-linear relationship with depth and a marked decline over time in Norway lobster’s abundance have been observed.
Direction
DOMINGUEZ CONDE, JESUS (Tutorships)
Otero Villar, Jaime (Co-tutorships)
González Herraiz, Isabel (Co-tutorships)
DOMINGUEZ CONDE, JESUS (Tutorships)
Otero Villar, Jaime (Co-tutorships)
González Herraiz, Isabel (Co-tutorships)
Court
BESTEIRO RODRIGUEZ, MARIA CELIA (Chairman)
BALBOA MENDEZ, SABELA (Secretary)
Rodriguez Diaz, Miguel Angel (Member)
BESTEIRO RODRIGUEZ, MARIA CELIA (Chairman)
BALBOA MENDEZ, SABELA (Secretary)
Rodriguez Diaz, Miguel Angel (Member)
Determination of environmental pollutants in feathers and pellets of white stork (Ciconia ciconia) in Galicia
Authorship
M.B.P.
Master in Terrestrial biodiversity: characterization, conservation and management
M.B.P.
Master in Terrestrial biodiversity: characterization, conservation and management
Defense date
06.27.2025 12:00
06.27.2025 12:00
Summary
The persistence of environmental contaminants such as mercury (Hg) and organochlorine pesticides poses a significant threat to wildlife, particularly to species occupying higher trophic levels. This study assessed the usefulness of the white stork (Ciconia ciconia) as a biomonitor for these compounds in Galicia, through the analysis of non-invasive matrices (feathers and pellets) collected from nine localities with different land-use types. The objectives were to quantify Hg and pesticide levels, determine the most appropriate matrix for biomonitoring, and explore potential links with human activity. Results revealed the widespread presence of Hg in all samples, with significantly higher concentrations in the rachis compared to the feather barbs, suggesting endogenous accumulation via the bloodstream during feather growth. In contrast, pellets showed much lower and more variable concentrations, limiting their effectiveness as a bioindicator matrix. Eleven different pesticides were detected, including long-banned substances such as DDT, lindane, and dieldrin, reflecting their high environmental persistence. Overall concentrations were low, and no risk thresholds were exceeded for the species. Principal component analysis (PCA) revealed certain groupings based on contaminant load and land use, with the highest concentrations observed in areas of intensive agriculture and livestock farming. These findings reinforce the value of feathers as a reliable and non-invasive tool for monitoring persistent contaminants in wild birds and contribute to a better understanding of the spatial distribution of pollution in agricultural landscapes.
The persistence of environmental contaminants such as mercury (Hg) and organochlorine pesticides poses a significant threat to wildlife, particularly to species occupying higher trophic levels. This study assessed the usefulness of the white stork (Ciconia ciconia) as a biomonitor for these compounds in Galicia, through the analysis of non-invasive matrices (feathers and pellets) collected from nine localities with different land-use types. The objectives were to quantify Hg and pesticide levels, determine the most appropriate matrix for biomonitoring, and explore potential links with human activity. Results revealed the widespread presence of Hg in all samples, with significantly higher concentrations in the rachis compared to the feather barbs, suggesting endogenous accumulation via the bloodstream during feather growth. In contrast, pellets showed much lower and more variable concentrations, limiting their effectiveness as a bioindicator matrix. Eleven different pesticides were detected, including long-banned substances such as DDT, lindane, and dieldrin, reflecting their high environmental persistence. Overall concentrations were low, and no risk thresholds were exceeded for the species. Principal component analysis (PCA) revealed certain groupings based on contaminant load and land use, with the highest concentrations observed in areas of intensive agriculture and livestock farming. These findings reinforce the value of feathers as a reliable and non-invasive tool for monitoring persistent contaminants in wild birds and contribute to a better understanding of the spatial distribution of pollution in agricultural landscapes.
Direction
FERNANDEZ ESCRIBANO, JOSE ANGEL (Tutorships)
VARELA RIO, ZULEMA (Co-tutorships)
FERNANDEZ ESCRIBANO, JOSE ANGEL (Tutorships)
VARELA RIO, ZULEMA (Co-tutorships)
Court
AMIGO VAZQUEZ, FRANCISCO JAVIER (Chairman)
LOPEZ RODRIGUEZ, Mª DEL CARMEN (Secretary)
REYES FERREIRA, OTILIA (Member)
AMIGO VAZQUEZ, FRANCISCO JAVIER (Chairman)
LOPEZ RODRIGUEZ, Mª DEL CARMEN (Secretary)
REYES FERREIRA, OTILIA (Member)
Sea bass (Dicentrarchus labrax) and sea bream (Sparus aurata) fattening at Bersolaz- Cooke Spain
Authorship
A.C.A.
Master in Aquaculture
A.C.A.
Master in Aquaculture
Defense date
06.13.2025 10:00
06.13.2025 10:00
Summary
During the internship period at Bersolaz, belonging to the Cooke España group, it was possible to observe the overall operation of a fattening farm dedicated to the intensive farming of sea bream (Sparus aurata) and sea bass (Dicentrarchus labrax) in floating cages on the Mediterranean coast, although it was possible to observe and participate in different departments such as feeding and maintenance, special emphasis was placed on the health department, which monitored and diagnosed diseases such as winter syndrome, photobacteriosis or sparicotilosis in gilthead sea bream, and in the case of sea bass, also focused on the prevention of photobacteriosis and the monitoring of the gonadal maturation of the males and the control of sudden death by maturation (SMS). In the feeding department, it was possible to monitor their growth, as well as modifications in the formulation of feed, adapting to new needs, both for growth and treatment of diseases. On the other hand, in the maintenance department, I observed the activities carried out such as changing nets, replacement of stakes, buoys or extraction of mortality, considering this department as the heart of the company. This experience has allowed me to consolidate theoretical knowledge and develop key practical skills for my development in the aquaculture sector.
During the internship period at Bersolaz, belonging to the Cooke España group, it was possible to observe the overall operation of a fattening farm dedicated to the intensive farming of sea bream (Sparus aurata) and sea bass (Dicentrarchus labrax) in floating cages on the Mediterranean coast, although it was possible to observe and participate in different departments such as feeding and maintenance, special emphasis was placed on the health department, which monitored and diagnosed diseases such as winter syndrome, photobacteriosis or sparicotilosis in gilthead sea bream, and in the case of sea bass, also focused on the prevention of photobacteriosis and the monitoring of the gonadal maturation of the males and the control of sudden death by maturation (SMS). In the feeding department, it was possible to monitor their growth, as well as modifications in the formulation of feed, adapting to new needs, both for growth and treatment of diseases. On the other hand, in the maintenance department, I observed the activities carried out such as changing nets, replacement of stakes, buoys or extraction of mortality, considering this department as the heart of the company. This experience has allowed me to consolidate theoretical knowledge and develop key practical skills for my development in the aquaculture sector.
Direction
BANDIN MATOS, MARIA ISABEL (Tutorships)
Castellar Carranza, Eva María (Co-tutorships)
BANDIN MATOS, MARIA ISABEL (Tutorships)
Castellar Carranza, Eva María (Co-tutorships)
Court
LAMAS FERNANDEZ, JESUS (Chairman)
MAGARIÑOS FERRO, BEATRIZ (Secretary)
PEREIRA DOPAZO, CARLOS (Member)
LAMAS FERNANDEZ, JESUS (Chairman)
MAGARIÑOS FERRO, BEATRIZ (Secretary)
PEREIRA DOPAZO, CARLOS (Member)
Animal Welfare and Production at Stolt Sea Farm, Lira (Carnota)
Authorship
P.C.P.
Master in Aquaculture
P.C.P.
Master in Aquaculture
Defense date
06.13.2025 10:00
06.13.2025 10:00
Summary
This Master's Thesis presents the experience gained during the internship period at the turbot fattening facility of Stolt Sea Farm in Lira. It provides an overview of the company, with a specific focus on the Lira plant, reviewing the tasks carried out by the different departments and offering an in-depth analysis of the pathologies affecting the farm. Finally, the internship is evaluated, and several improvement proposals are suggested.
This Master's Thesis presents the experience gained during the internship period at the turbot fattening facility of Stolt Sea Farm in Lira. It provides an overview of the company, with a specific focus on the Lira plant, reviewing the tasks carried out by the different departments and offering an in-depth analysis of the pathologies affecting the farm. Finally, the internship is evaluated, and several improvement proposals are suggested.
Direction
BANDIN MATOS, MARIA ISABEL (Tutorships)
Castaño Varela, Iria (Co-tutorships)
BANDIN MATOS, MARIA ISABEL (Tutorships)
Castaño Varela, Iria (Co-tutorships)
Court
LAMAS FERNANDEZ, JESUS (Chairman)
MAGARIÑOS FERRO, BEATRIZ (Secretary)
PEREIRA DOPAZO, CARLOS (Member)
LAMAS FERNANDEZ, JESUS (Chairman)
MAGARIÑOS FERRO, BEATRIZ (Secretary)
PEREIRA DOPAZO, CARLOS (Member)
Determinants of the winter distribution of the Kentish plover (Charadrius alexandrinus) on the Galician coast
Authorship
S.E.D.P.
Master in Terrestrial biodiversity: characterization, conservation and management
S.E.D.P.
Master in Terrestrial biodiversity: characterization, conservation and management
Defense date
02.21.2025 09:30
02.21.2025 09:30
Summary
The Kentish plover (Charadrius alexandrinus L) population in Galicia are experiencing a downfall in their numbers. This Galician population is mostly on a permanent resident status the year round, hence studying its distribution not only as a breeding species, but also as a wintering population is accurate. This research aims to determine the environmental factors (physical and meteorological) that hold influence in the presence and abundance of this species in the Galician shoreline during winter. The presence of this Kentish plover is determined by climatic factors regarding temperature, such as the daily range of temperature and the annual average temperature, whereas the variables concerning precipitation do not seem to conditionate the presence of this species in the Galician shoreline. Aside, the abundance can be explained by physical factors, which characterize the beaches where most individuals can be spotted. Beaches associated with lagoons and with larger spans have proved to be the factors that influence the most in the wintering populations. Contrarily, the presence of dune vegetation has shown a negative influence in the abundance of Kentish plover populations.
The Kentish plover (Charadrius alexandrinus L) population in Galicia are experiencing a downfall in their numbers. This Galician population is mostly on a permanent resident status the year round, hence studying its distribution not only as a breeding species, but also as a wintering population is accurate. This research aims to determine the environmental factors (physical and meteorological) that hold influence in the presence and abundance of this species in the Galician shoreline during winter. The presence of this Kentish plover is determined by climatic factors regarding temperature, such as the daily range of temperature and the annual average temperature, whereas the variables concerning precipitation do not seem to conditionate the presence of this species in the Galician shoreline. Aside, the abundance can be explained by physical factors, which characterize the beaches where most individuals can be spotted. Beaches associated with lagoons and with larger spans have proved to be the factors that influence the most in the wintering populations. Contrarily, the presence of dune vegetation has shown a negative influence in the abundance of Kentish plover populations.
Direction
DOMINGUEZ CONDE, JESUS (Tutorships)
DOMINGUEZ CONDE, JESUS (Tutorships)
Court
FERNANDEZ ESCRIBANO, JOSE ANGEL (Chairman)
BASELGA FRAGA, ANDRES (Secretary)
ROMERO BUJAN, MARIA INMACULADA (Member)
FERNANDEZ ESCRIBANO, JOSE ANGEL (Chairman)
BASELGA FRAGA, ANDRES (Secretary)
ROMERO BUJAN, MARIA INMACULADA (Member)
MALDI TOF Mass Spectrometry as a Rapid, Reliable, and Cost Effective Method for the Identification of Bacteria Associated with Bivalves and Fish
Authorship
A.E.A.
Master in Marine Biology
A.E.A.
Master in Marine Biology
Defense date
06.27.2025 10:00
06.27.2025 10:00
Summary
Spain is a benchmark in aquaculture due to the diversity of cultivated species, with Galicia being the main production region for mussels and clams. However, the sector faces significant health challenges, particularly related to bacterial diseases. Currently, the most widely used method for bacterial identification is 16S rDNA gene sequencing, although its routine application is limited by high costs and the time required. In this context, this study evaluates the effectiveness of MALDI TOF mass spectrometry as a fast and reliable alternative for identifying bacteria associated with the microbiota of fish and mollusks in Galicia. A total of 348 bacterial strains were analyzed, both from collections and isolates, considering three different variables: culture medium, incubation time, and temperature. Technical (n = 3) and biological (n = 10) replicas were conducted, resulting in 653 assays distributed across 10 target plates. The samples were processed using the MALDI TOF Biotyper MBT smart system, and the obtained spectra were compared with the Bruker database. Additionally, 70 Main Spectrum Profiles (MSP) were generated using Mass Up software, with which a customized database (GiPA1) was built. A satisfactory identification was obtained in 200 strains: 119 with high confidence (score 2.00) and 81 with medium confidence (score between 1.70 and 1.99), with a high concordance with 16S rDNA gene sequencing (Kappa index = 0.89). The identified species mainly belong to the genera Vibrio, Photobacterium, Aeromonas, Pseudoalteromonas, and Shewanella, although some limitations in species-level discrimination were observed due to the lack of specific spectral profiles in the Bruker database and reduced identification capability in strains cultured for more than seven days. The results demonstrated that MALDI TOF is an effective, rapid, and reproducible tool for bacterial identification in aquaculture. Its high operational scalability, capable of processing dozens to hundreds of samples per day, makes it an ideal tool for aquaculture diagnostic laboratories. Its implementation could optimize diagnostic processes and contribute to more efficient sector management.
Spain is a benchmark in aquaculture due to the diversity of cultivated species, with Galicia being the main production region for mussels and clams. However, the sector faces significant health challenges, particularly related to bacterial diseases. Currently, the most widely used method for bacterial identification is 16S rDNA gene sequencing, although its routine application is limited by high costs and the time required. In this context, this study evaluates the effectiveness of MALDI TOF mass spectrometry as a fast and reliable alternative for identifying bacteria associated with the microbiota of fish and mollusks in Galicia. A total of 348 bacterial strains were analyzed, both from collections and isolates, considering three different variables: culture medium, incubation time, and temperature. Technical (n = 3) and biological (n = 10) replicas were conducted, resulting in 653 assays distributed across 10 target plates. The samples were processed using the MALDI TOF Biotyper MBT smart system, and the obtained spectra were compared with the Bruker database. Additionally, 70 Main Spectrum Profiles (MSP) were generated using Mass Up software, with which a customized database (GiPA1) was built. A satisfactory identification was obtained in 200 strains: 119 with high confidence (score 2.00) and 81 with medium confidence (score between 1.70 and 1.99), with a high concordance with 16S rDNA gene sequencing (Kappa index = 0.89). The identified species mainly belong to the genera Vibrio, Photobacterium, Aeromonas, Pseudoalteromonas, and Shewanella, although some limitations in species-level discrimination were observed due to the lack of specific spectral profiles in the Bruker database and reduced identification capability in strains cultured for more than seven days. The results demonstrated that MALDI TOF is an effective, rapid, and reproducible tool for bacterial identification in aquaculture. Its high operational scalability, capable of processing dozens to hundreds of samples per day, makes it an ideal tool for aquaculture diagnostic laboratories. Its implementation could optimize diagnostic processes and contribute to more efficient sector management.
Direction
BARJA PEREZ, JUAN LUIS (Tutorships)
BARJA PEREZ, JUAN LUIS (Tutorships)
Court
BESTEIRO RODRIGUEZ, MARIA CELIA (Chairman)
BALBOA MENDEZ, SABELA (Secretary)
Rodriguez Diaz, Miguel Angel (Member)
BESTEIRO RODRIGUEZ, MARIA CELIA (Chairman)
BALBOA MENDEZ, SABELA (Secretary)
Rodriguez Diaz, Miguel Angel (Member)
Ecological Consequences of the Expansion of Rugulopteryx okamurae on the Interaction Between Fish and the Benthic Habitat in Madeira.
Authorship
A.E.C.
Master in Marine Biology
A.E.C.
Master in Marine Biology
Defense date
06.27.2025 10:00
06.27.2025 10:00
Summary
The macroalga Rugulopteryx okamurae has been recognized as one of the most problematic invasive species in marine ecosystems of the western Mediterranean and the northeastern Atlantic over recent decades. Its rapid spread and high coverage significantly alter the benthic community, generating cascading effects on other faunal groups that have not yet been studied. In this work, the impact of the species on the structure and interactions of the benthic fish community on the southern coast of Madeira is evaluated. For this purpose, underwater video cameras were used to document the presence, interest, use of shelter, and foraging activity (duration and number of bites) on this species and another tree-like macroalga in the area across three zones and different treatments: ASP (plots dominated by Asparagopsis taxiformis), RGX (plots dominated by R. okamurae), and RGXASP (approximately 50% coverage of both species). The results show that, in terms of community structure, there are no significant differences between the different treatments. However, certain interaction patterns were detected, such as presence and use of shelter, where R. okamurae does not seem to generate a clearly negative effect on the fish community. Nevertheless, the foraging rate and number of bites were considerably lower in areas with high coverage of R. okamurae, suggesting that this macroalga and/or its associated fauna do not represent a high nutritional value resource, potentially altering the trophic structure in monopolization scenarios, as observed in other invaded areas. This study highlights the need to continue monitoring the expansion of R. okamurae on invaded coasts to mitigate its potential impacts on ecosystem functionality.
The macroalga Rugulopteryx okamurae has been recognized as one of the most problematic invasive species in marine ecosystems of the western Mediterranean and the northeastern Atlantic over recent decades. Its rapid spread and high coverage significantly alter the benthic community, generating cascading effects on other faunal groups that have not yet been studied. In this work, the impact of the species on the structure and interactions of the benthic fish community on the southern coast of Madeira is evaluated. For this purpose, underwater video cameras were used to document the presence, interest, use of shelter, and foraging activity (duration and number of bites) on this species and another tree-like macroalga in the area across three zones and different treatments: ASP (plots dominated by Asparagopsis taxiformis), RGX (plots dominated by R. okamurae), and RGXASP (approximately 50% coverage of both species). The results show that, in terms of community structure, there are no significant differences between the different treatments. However, certain interaction patterns were detected, such as presence and use of shelter, where R. okamurae does not seem to generate a clearly negative effect on the fish community. Nevertheless, the foraging rate and number of bites were considerably lower in areas with high coverage of R. okamurae, suggesting that this macroalga and/or its associated fauna do not represent a high nutritional value resource, potentially altering the trophic structure in monopolization scenarios, as observed in other invaded areas. This study highlights the need to continue monitoring the expansion of R. okamurae on invaded coasts to mitigate its potential impacts on ecosystem functionality.
Direction
DOMINGUEZ CONDE, JESUS (Tutorships)
Florido Capilla, Marta (Co-tutorships)
DOMINGUEZ CONDE, JESUS (Tutorships)
Florido Capilla, Marta (Co-tutorships)
Court
BESTEIRO RODRIGUEZ, MARIA CELIA (Chairman)
BALBOA MENDEZ, SABELA (Secretary)
Rodriguez Diaz, Miguel Angel (Member)
BESTEIRO RODRIGUEZ, MARIA CELIA (Chairman)
BALBOA MENDEZ, SABELA (Secretary)
Rodriguez Diaz, Miguel Angel (Member)
Development and validation of a new behavioral paradigm for the study of socio-sexual communication in zebrafish (Dario rerio)
Authorship
N.T.F.G.
Master in Marine Biology
N.T.F.G.
Master in Marine Biology
Defense date
06.27.2025 10:00
06.27.2025 10:00
Summary
Recognition of the individual and sexual identity of conspecifics is fundamental for regulating social and adaptive behavior in animals. This socio-sexual recognition, mediated primarily by visual and olfactory cues, modulates reproductive, hierarchical and territorial interactions through the synchronization of hormonal and neural processes. Although multisensory communication has been extensively documented in model species such as Mesocricetus auratus and Drosophila melanogaster, its study in fish is still limited. In this context, the zebrafish (Danio rerio) has established itself as an exceptional experimental model due to its small size, fast life cycle, high reproductive rate, low maintenance cost and ease of genetic manipulation. The present study focused on developing and validating a new experimental paradigm for the analysis of socio-sexual discrimination in zebrafish by studying their ability to distinguish between different types of conspecifics. We assessed how male and female zebrafish responded to different socio-sexual stimuli, assessing both their sexual preference and exploratory behavior to visual, olfactory or combined visual and olfactory cues. The results indicated that the socio-sexual recognition of males relies mainly on olfactory cues in the recognition of conspecifics. In contrast, females did not show a distinct preference, which could be related to their less active role in courtship and a greater investment in evaluating the social and environmental context before making reproductive decisions. Furthermore, the consistently high levels of exploration observed in all trials, together with the results of the control experiments, in which individuals showed no preference when presented with conspecifics of the same sex, supported the validity of the experimental paradigm employed.
Recognition of the individual and sexual identity of conspecifics is fundamental for regulating social and adaptive behavior in animals. This socio-sexual recognition, mediated primarily by visual and olfactory cues, modulates reproductive, hierarchical and territorial interactions through the synchronization of hormonal and neural processes. Although multisensory communication has been extensively documented in model species such as Mesocricetus auratus and Drosophila melanogaster, its study in fish is still limited. In this context, the zebrafish (Danio rerio) has established itself as an exceptional experimental model due to its small size, fast life cycle, high reproductive rate, low maintenance cost and ease of genetic manipulation. The present study focused on developing and validating a new experimental paradigm for the analysis of socio-sexual discrimination in zebrafish by studying their ability to distinguish between different types of conspecifics. We assessed how male and female zebrafish responded to different socio-sexual stimuli, assessing both their sexual preference and exploratory behavior to visual, olfactory or combined visual and olfactory cues. The results indicated that the socio-sexual recognition of males relies mainly on olfactory cues in the recognition of conspecifics. In contrast, females did not show a distinct preference, which could be related to their less active role in courtship and a greater investment in evaluating the social and environmental context before making reproductive decisions. Furthermore, the consistently high levels of exploration observed in all trials, together with the results of the control experiments, in which individuals showed no preference when presented with conspecifics of the same sex, supported the validity of the experimental paradigm employed.
Direction
DOMINGUEZ CONDE, JESUS (Tutorships)
Espigares Puerto, Felipe (Co-tutorships)
DOMINGUEZ CONDE, JESUS (Tutorships)
Espigares Puerto, Felipe (Co-tutorships)
Court
BESTEIRO RODRIGUEZ, MARIA CELIA (Chairman)
BALBOA MENDEZ, SABELA (Secretary)
Rodriguez Diaz, Miguel Angel (Member)
BESTEIRO RODRIGUEZ, MARIA CELIA (Chairman)
BALBOA MENDEZ, SABELA (Secretary)
Rodriguez Diaz, Miguel Angel (Member)
Effect of defense induction by methyl jasmonate and the influence of family on the concentration and emission of terpenes in young individuals of Pinus pinaster Ait.
Authorship
R.F.T.
Master in Terrestrial biodiversity: characterization, conservation and management
R.F.T.
Master in Terrestrial biodiversity: characterization, conservation and management
Defense date
02.21.2025 09:30
02.21.2025 09:30
Summary
The production and release of defensive chemical compounds is a strategy employed by plants to protect themselves against their aggressors. In pines, the production and emission of terpenes are key functions in both direct and indirect resistance. However, there is limited knowledge about the factors that modulate the emission of these compounds. Advances in this field could lead to interesting applications for improving forest health. In this study, we experimentally investigated studied changes in terpene emission and foliar content following the induction of defenses in pine seedlings. The induction was carried out by applying methyl jasmonate (MeJa), an important phytohormone involved in herbivore damage signaling. We used plants from four families, which allowed for the collection of information regarding genetic variation. We selected 32 seedlings from four half-sister families. The experiment was conducted in four blocks, each containing two plants from each family (n=8), in a growth chamber. The volatiles were collected using carbon traps connected to air flow pumps. Sampling of volatile and foliar terpenes was carried out before and five days after the application of MeJa at a low concentration (5 mM). The solution was applied to half of the plants. The mono- and sesquiterpenes in needles and carbon traps were analyzed by gas chromatography with flame ionization detector (GC-FID). To identify the influence of variables on terpene levels, we applied generalized linear models (GLM) with fixed effects, and the correlation coefficient was calculated based on Pearson’s model. Upon analyzing the constitutive defenses (before induction), we found a significant family effect on the concentration of total terpenes, monoterpenes, and sesquiterpenes. Five days after the induction application, no significant changes were found in foliar concentration, although greater variation was observed between plants. The family effect on concentration remained for total terpenes and monoterpenes, and furthermore, a significant interaction effect between family and treatment was identified for these two categories. The induction resulted in a significant increase in the emission of monoterpenes and total terpenes, with the emission rate in induced plants being 3.6 times higher than in controls. We found a significant correlation between foliar concentration and the induced emission rate only for the monoterpene 3-carene, which was not observed for the other compounds. Terpene emission appears to be a rapid and MeJa-dependent induced mechanism, activated even when exposed to low MeJa concentrations. The family effect has a strong influence on the concentration of volatile terpenes in the leaves and persists after 5 days of plant exposure to low MeJa concentrations. The FamxMeJa interaction indicates a different sensitivity to MeJa between families that should be considered. The experimental procedure appears to be appropriate for future studies.
The production and release of defensive chemical compounds is a strategy employed by plants to protect themselves against their aggressors. In pines, the production and emission of terpenes are key functions in both direct and indirect resistance. However, there is limited knowledge about the factors that modulate the emission of these compounds. Advances in this field could lead to interesting applications for improving forest health. In this study, we experimentally investigated studied changes in terpene emission and foliar content following the induction of defenses in pine seedlings. The induction was carried out by applying methyl jasmonate (MeJa), an important phytohormone involved in herbivore damage signaling. We used plants from four families, which allowed for the collection of information regarding genetic variation. We selected 32 seedlings from four half-sister families. The experiment was conducted in four blocks, each containing two plants from each family (n=8), in a growth chamber. The volatiles were collected using carbon traps connected to air flow pumps. Sampling of volatile and foliar terpenes was carried out before and five days after the application of MeJa at a low concentration (5 mM). The solution was applied to half of the plants. The mono- and sesquiterpenes in needles and carbon traps were analyzed by gas chromatography with flame ionization detector (GC-FID). To identify the influence of variables on terpene levels, we applied generalized linear models (GLM) with fixed effects, and the correlation coefficient was calculated based on Pearson’s model. Upon analyzing the constitutive defenses (before induction), we found a significant family effect on the concentration of total terpenes, monoterpenes, and sesquiterpenes. Five days after the induction application, no significant changes were found in foliar concentration, although greater variation was observed between plants. The family effect on concentration remained for total terpenes and monoterpenes, and furthermore, a significant interaction effect between family and treatment was identified for these two categories. The induction resulted in a significant increase in the emission of monoterpenes and total terpenes, with the emission rate in induced plants being 3.6 times higher than in controls. We found a significant correlation between foliar concentration and the induced emission rate only for the monoterpene 3-carene, which was not observed for the other compounds. Terpene emission appears to be a rapid and MeJa-dependent induced mechanism, activated even when exposed to low MeJa concentrations. The family effect has a strong influence on the concentration of volatile terpenes in the leaves and persists after 5 days of plant exposure to low MeJa concentrations. The FamxMeJa interaction indicates a different sensitivity to MeJa between families that should be considered. The experimental procedure appears to be appropriate for future studies.
Direction
FERNANDEZ ESCRIBANO, JOSE ANGEL (Tutorships)
Sampedro Pérez, Luis (Co-tutorships)
FERNANDEZ ESCRIBANO, JOSE ANGEL (Tutorships)
Sampedro Pérez, Luis (Co-tutorships)
Court
FERNANDEZ ESCRIBANO, JOSE ANGEL (Chairman)
BASELGA FRAGA, ANDRES (Secretary)
ROMERO BUJAN, MARIA INMACULADA (Member)
FERNANDEZ ESCRIBANO, JOSE ANGEL (Chairman)
BASELGA FRAGA, ANDRES (Secretary)
ROMERO BUJAN, MARIA INMACULADA (Member)
The effect of peat molecular composition on mercury accumulation in Boreal and Atlantic bogs: peat composition really matters
Authorship
A.F.G.
Master in Terrestrial biodiversity: characterization, conservation and management
A.F.G.
Master in Terrestrial biodiversity: characterization, conservation and management
Defense date
06.27.2025 12:00
06.27.2025 12:00
Summary
Ombrotrophic peatlands are recognized as valuable natural archives for reconstructing atmospheric mercury deposition. This study investigates the relationship between Hg concentration and peat organic matter (POM) composition by comparing two geographically and bioclimatically distinct peatlands: Store Mosse, a boreal bog in southern Sweden, and Chao de Lamoso, an Atlantic bog in northwestern Spain. Mercury concentrations were quantified using a Direct Mercury Analyzer (DMA-80), while peat organic matter composition and humification were assessed trough Fourier-transform infrared (FTIR) spectroscopy. Spectral indices and transposed principal component analysis (tPCA) revealed contrasting patterns of POM composition among the two sites. The observed correlation between Hg concentrations and polysaccharide-rich fractions suggests that labile organic matter plays a key role in Hg retention and underscore the influence of site-specific climatic and biogeochemical factors. These results highlight the importance of incorporating molecular-level peat composition analysis into future assessments of Hg deposition, particularly in the context of ongoing climate change and peatland degradation.
Ombrotrophic peatlands are recognized as valuable natural archives for reconstructing atmospheric mercury deposition. This study investigates the relationship between Hg concentration and peat organic matter (POM) composition by comparing two geographically and bioclimatically distinct peatlands: Store Mosse, a boreal bog in southern Sweden, and Chao de Lamoso, an Atlantic bog in northwestern Spain. Mercury concentrations were quantified using a Direct Mercury Analyzer (DMA-80), while peat organic matter composition and humification were assessed trough Fourier-transform infrared (FTIR) spectroscopy. Spectral indices and transposed principal component analysis (tPCA) revealed contrasting patterns of POM composition among the two sites. The observed correlation between Hg concentrations and polysaccharide-rich fractions suggests that labile organic matter plays a key role in Hg retention and underscore the influence of site-specific climatic and biogeochemical factors. These results highlight the importance of incorporating molecular-level peat composition analysis into future assessments of Hg deposition, particularly in the context of ongoing climate change and peatland degradation.
Direction
MARTINEZ CORTIZAS, ANTONIO MANUEL (Tutorships)
MARTINEZ CORTIZAS, ANTONIO MANUEL (Tutorships)
Court
AMIGO VAZQUEZ, FRANCISCO JAVIER (Chairman)
LOPEZ RODRIGUEZ, Mª DEL CARMEN (Secretary)
REYES FERREIRA, OTILIA (Member)
AMIGO VAZQUEZ, FRANCISCO JAVIER (Chairman)
LOPEZ RODRIGUEZ, Mª DEL CARMEN (Secretary)
REYES FERREIRA, OTILIA (Member)
Consistency in a changing world: structure of the Anllóns river estuary (A Coruña) in the long term
Authorship
R.I.M.
Master in Terrestrial biodiversity: characterization, conservation and management
R.I.M.
Master in Terrestrial biodiversity: characterization, conservation and management
Defense date
02.21.2025 09:30
02.21.2025 09:30
Summary
The aim of this study was to analyse long-term changes (2001-2023) in the structure of a passerine bird community, both during wintering and breeding, in a reedbed habitat at the Anllóns river estuary (A Coruña, NW Spain) based on ringing data. For the wintering community we expected a priori a change in the origin of the birds (with a lower representation of birds from higher latitudes) within the context of modern warming. For this purpose, the 7 species with the most complete information were selected and the variation over time in mean size (and variance) of wing chord, eighth primary (P8), tarsus and wing/tarsus ratio were studied. For the breeding community, a change in composition caused by the general increase in Sus scrofa wild boar populations linked to the abandonment of the rural world was initially expected. To test this hypothesis, temporal changes in the Shannon index and variation in the relative abundances of the 9 breeding species were analysed. There was no evidence of change in the origin of birds in any of the species selected to test the first hypothesis, using body size as a proxy. In the case of the second hypothesis, the Shannon index remained roughly constant over time and relative community abundances also did not follow a consistent temporal pattern. We conclude that, contrary to initial expectations, both communities (wintering and breeding) have hardly changed over the 22-year study period. Such constancy suggests a lack of effect of climate warming in recent decades and points to the absence of substantial environmental changes in the estuary during the breeding period. The profound ecological changes associated with the abandonment of the countryside in recent decades do not seem to have affected the study area, probably because cultivation ceased more than 40 years ago, judging by the available aerial images from the 20th century, and plant succession is at an advanced stage. Wild boars do not seem to have influenced the breeding community as these birds do not breed strictly on the ground, although in some cases they nest close to the ground.
The aim of this study was to analyse long-term changes (2001-2023) in the structure of a passerine bird community, both during wintering and breeding, in a reedbed habitat at the Anllóns river estuary (A Coruña, NW Spain) based on ringing data. For the wintering community we expected a priori a change in the origin of the birds (with a lower representation of birds from higher latitudes) within the context of modern warming. For this purpose, the 7 species with the most complete information were selected and the variation over time in mean size (and variance) of wing chord, eighth primary (P8), tarsus and wing/tarsus ratio were studied. For the breeding community, a change in composition caused by the general increase in Sus scrofa wild boar populations linked to the abandonment of the rural world was initially expected. To test this hypothesis, temporal changes in the Shannon index and variation in the relative abundances of the 9 breeding species were analysed. There was no evidence of change in the origin of birds in any of the species selected to test the first hypothesis, using body size as a proxy. In the case of the second hypothesis, the Shannon index remained roughly constant over time and relative community abundances also did not follow a consistent temporal pattern. We conclude that, contrary to initial expectations, both communities (wintering and breeding) have hardly changed over the 22-year study period. Such constancy suggests a lack of effect of climate warming in recent decades and points to the absence of substantial environmental changes in the estuary during the breeding period. The profound ecological changes associated with the abandonment of the countryside in recent decades do not seem to have affected the study area, probably because cultivation ceased more than 40 years ago, judging by the available aerial images from the 20th century, and plant succession is at an advanced stage. Wild boars do not seem to have influenced the breeding community as these birds do not breed strictly on the ground, although in some cases they nest close to the ground.
Direction
MARTÍNEZ ABRAÍN, ALEJANDRO (Tutorships)
Maestro Saavedra, Miguel Ángel (Co-tutorships)
MARTÍNEZ ABRAÍN, ALEJANDRO (Tutorships)
Maestro Saavedra, Miguel Ángel (Co-tutorships)
Court
FERNANDEZ ESCRIBANO, JOSE ANGEL (Chairman)
BASELGA FRAGA, ANDRES (Secretary)
ROMERO BUJAN, MARIA INMACULADA (Member)
FERNANDEZ ESCRIBANO, JOSE ANGEL (Chairman)
BASELGA FRAGA, ANDRES (Secretary)
ROMERO BUJAN, MARIA INMACULADA (Member)
Health Management in Atlantic Salmon Aquaculture. Experience at MOWI ASA, Ireland
Authorship
G.J.B.
Master in Aquaculture
G.J.B.
Master in Aquaculture
Defense date
02.11.2025 12:00
02.11.2025 12:00
Summary
The document outlines health management practices in Atlantic salmon aquaculture at Mowi ASA, Ireland. It details key processes such as the selection and management of the breeding stock, egg fertilization and incubation, health monitoring, vaccination, and biosecurity. Additionally, it addresses common diseases, including salmon rickettsial septicemia, tenacibaculosis, and amoebic gill disease, as well as control strategies such as the use of cleaner fish. Finally, it highlights challenges such as the proximity of farming stations and the need to reduce antibiotic use through vaccination programs.
The document outlines health management practices in Atlantic salmon aquaculture at Mowi ASA, Ireland. It details key processes such as the selection and management of the breeding stock, egg fertilization and incubation, health monitoring, vaccination, and biosecurity. Additionally, it addresses common diseases, including salmon rickettsial septicemia, tenacibaculosis, and amoebic gill disease, as well as control strategies such as the use of cleaner fish. Finally, it highlights challenges such as the proximity of farming stations and the need to reduce antibiotic use through vaccination programs.
Direction
BANDIN MATOS, MARIA ISABEL (Tutorships)
Vesanto , Sandra (Co-tutorships)
BANDIN MATOS, MARIA ISABEL (Tutorships)
Vesanto , Sandra (Co-tutorships)
Court
LAMAS FERNANDEZ, JESUS (Chairman)
MAGARIÑOS FERRO, BEATRIZ (Secretary)
SANTOS RODRIGUEZ, MARIA ISABEL (Member)
LAMAS FERNANDEZ, JESUS (Chairman)
MAGARIÑOS FERRO, BEATRIZ (Secretary)
SANTOS RODRIGUEZ, MARIA ISABEL (Member)
Characterization of HSP genes and calibration of qRT-PCR in Mytilus galloprovincialis
Authorship
L.L.P.
Master in Aquaculture
L.L.P.
Master in Aquaculture
Defense date
02.11.2025 12:00
02.11.2025 12:00
Summary
Climate change is predicted to negatively affect mussel (Mytilus galloprovincialis) culture in Galicia. In order to take measures against that impact, it is necessary to understand the molecular mechanisms of the species involved in heat resistance. Heat Shock Proteins (hsp) are a key factor in cellular homeostasis as well as the biological response to thermal stress. However, comparative analyses of HSP gene expression in different conditions of thermal stress have not yet been carried out. This research establishes the bases to carry out such analyses by characterizing HSP genes, establishing the phylogenetic relationships of their gene families and calibrating specific primers for quantitative PCR experiments. Ten genes potentially involved in the response to thermal stress were chosen and sequenced. Their phylogenetic analysis showcased interspecific grouping of the orthologous genes according to gene sub-family rather than to species. Primers for six HSP genes and one housekeeping gene were successfully designed and calibrated. Their standard curves and their efficiencies for qRT-PCR analyses were also established. This study provides a molecular tool to quantify the differential expression of HSP genes in response to in vitro induced thermal stress in M. galloprovincialis.
Climate change is predicted to negatively affect mussel (Mytilus galloprovincialis) culture in Galicia. In order to take measures against that impact, it is necessary to understand the molecular mechanisms of the species involved in heat resistance. Heat Shock Proteins (hsp) are a key factor in cellular homeostasis as well as the biological response to thermal stress. However, comparative analyses of HSP gene expression in different conditions of thermal stress have not yet been carried out. This research establishes the bases to carry out such analyses by characterizing HSP genes, establishing the phylogenetic relationships of their gene families and calibrating specific primers for quantitative PCR experiments. Ten genes potentially involved in the response to thermal stress were chosen and sequenced. Their phylogenetic analysis showcased interspecific grouping of the orthologous genes according to gene sub-family rather than to species. Primers for six HSP genes and one housekeeping gene were successfully designed and calibrated. Their standard curves and their efficiencies for qRT-PCR analyses were also established. This study provides a molecular tool to quantify the differential expression of HSP genes in response to in vitro induced thermal stress in M. galloprovincialis.
Direction
BANDIN MATOS, MARIA ISABEL (Tutorships)
Presa Martínez, Pablo (Co-tutorships)
BANDIN MATOS, MARIA ISABEL (Tutorships)
Presa Martínez, Pablo (Co-tutorships)
Court
LAMAS FERNANDEZ, JESUS (Chairman)
MAGARIÑOS FERRO, BEATRIZ (Secretary)
SANTOS RODRIGUEZ, MARIA ISABEL (Member)
LAMAS FERNANDEZ, JESUS (Chairman)
MAGARIÑOS FERRO, BEATRIZ (Secretary)
SANTOS RODRIGUEZ, MARIA ISABEL (Member)
Approach to the study of otoliths in Danio rerio
Authorship
T.M.C.
Master in Marine Biology
T.M.C.
Master in Marine Biology
Defense date
02.25.2025 10:00
02.25.2025 10:00
Summary
Determining the age of fish in natural environments is crucial for understanding their biology and ecology, and otoliths, by recording growth rings, represent a valuable tool in this process. However, their reliability must be validated for each species. This study analyzes the use of otoliths as a method for estimating age in zebrafish (Danio rerio) and their relationship with the organism’s actual growth. Zebrafish possess three pairs of otoliths (lapillus, asteriscus, and sagitta), but due to the fragility of the sagitta, the analysis focused on the first two. The results show that the lapillus is the most suitable otolith for age estimation, as its ring count correlates better with the fish’s actual age (R² lapillus = 0.6909 vs. R² asteriscus = 0.6481). However, the growth models generated indicate that while the lapillus predicts a more accurate maximum length (L∞ = 2.87 cm vs. 2.96 cm in the real model), it overestimates the growth rate (k = 8.46 years vs. 2.03 years in the real model), suggesting that it grows faster in proportion to the fish. On the other hand, the asteriscus predicts a growth rate closer to the actual one (k = 2.79 years) but overestimates the expected maximum length (L∞ = 3.95 cm vs. 2.96 cm in the real model). This suggests that while the asteriscus is optimal for predicting age, it does not accurately reflect the organism’s final size. Given the number of fish used (18), these data and the reliability of the models obtained could be improved by increasing the sample size, including older fish, and optimizing ring visualization techniques. In this regard, experiments were conducted using stains such as alizarin red (ARS) and tetracycline (TC-H), which are incorporated into the otolith during growth. However, the results were also insufficient, requiring better concentration adjustments. Overall, the results indicate that otolith growth in zebrafish follows an allometric pattern and suggest that the periodicity of ring formation changes with age: in young individuals (less than 94 days), rings appear almost daily, while in adults (over 371 days), they form every 2–3 days, which could be affecting the accuracy of age estimates. In conclusion, although the lapillus emerges as the best age indicator in zebrafish, its use still requires adjustments to improve accuracy. Future research should focus on optimizing ring reading and refining growth models to achieve more reliable estimates.
Determining the age of fish in natural environments is crucial for understanding their biology and ecology, and otoliths, by recording growth rings, represent a valuable tool in this process. However, their reliability must be validated for each species. This study analyzes the use of otoliths as a method for estimating age in zebrafish (Danio rerio) and their relationship with the organism’s actual growth. Zebrafish possess three pairs of otoliths (lapillus, asteriscus, and sagitta), but due to the fragility of the sagitta, the analysis focused on the first two. The results show that the lapillus is the most suitable otolith for age estimation, as its ring count correlates better with the fish’s actual age (R² lapillus = 0.6909 vs. R² asteriscus = 0.6481). However, the growth models generated indicate that while the lapillus predicts a more accurate maximum length (L∞ = 2.87 cm vs. 2.96 cm in the real model), it overestimates the growth rate (k = 8.46 years vs. 2.03 years in the real model), suggesting that it grows faster in proportion to the fish. On the other hand, the asteriscus predicts a growth rate closer to the actual one (k = 2.79 years) but overestimates the expected maximum length (L∞ = 3.95 cm vs. 2.96 cm in the real model). This suggests that while the asteriscus is optimal for predicting age, it does not accurately reflect the organism’s final size. Given the number of fish used (18), these data and the reliability of the models obtained could be improved by increasing the sample size, including older fish, and optimizing ring visualization techniques. In this regard, experiments were conducted using stains such as alizarin red (ARS) and tetracycline (TC-H), which are incorporated into the otolith during growth. However, the results were also insufficient, requiring better concentration adjustments. Overall, the results indicate that otolith growth in zebrafish follows an allometric pattern and suggest that the periodicity of ring formation changes with age: in young individuals (less than 94 days), rings appear almost daily, while in adults (over 371 days), they form every 2–3 days, which could be affecting the accuracy of age estimates. In conclusion, although the lapillus emerges as the best age indicator in zebrafish, its use still requires adjustments to improve accuracy. Future research should focus on optimizing ring reading and refining growth models to achieve more reliable estimates.
Direction
DOMINGUEZ CONDE, JESUS (Tutorships)
Rey Sanz, Javier (Co-tutorships)
Marí Beffa, Manuel (Co-tutorships)
DOMINGUEZ CONDE, JESUS (Tutorships)
Rey Sanz, Javier (Co-tutorships)
Marí Beffa, Manuel (Co-tutorships)
Court
BESTEIRO RODRIGUEZ, MARIA CELIA (Chairman)
BALBOA MENDEZ, SABELA (Secretary)
Rodriguez Diaz, Miguel Angel (Member)
BESTEIRO RODRIGUEZ, MARIA CELIA (Chairman)
BALBOA MENDEZ, SABELA (Secretary)
Rodriguez Diaz, Miguel Angel (Member)
Post-fire germination behavior of shrub species and projection of their ecological niche in current and future climate contexts
Authorship
R.M.B.
Master in Terrestrial biodiversity: characterization, conservation and management
R.M.B.
Master in Terrestrial biodiversity: characterization, conservation and management
Defense date
06.27.2025 12:00
06.27.2025 12:00
Summary
The Iberian Peninsula experiences a high incidence of wildfires, particularly in the northwest, with shrublands being the most affected ecosystems, accounting for nearly 60% of the burned area. The species associated with these formations are exposed to recurrent disturbances, impacting the seed bank and compromising regeneration. In the current context of climate change, a modification of the fire regime is expected, which will vary by region and could increase the exposure of certain species to this type of disturbance. In this regard, ecological niche modeling is a useful tool to analyze the potential overlap between species’ distribution areas and regions with a higher incidence of fire. This study aims to evaluate the response of four shrubland species (Cytisus commutatus, Erica erigena, Erica vagans, and Vaccinium myrtillus) to wildfires, integrating ecological niche analysis with germination response. To achieve this, an experiment was designed in which seeds were subjected to treatments involving temperature, smoke, ash, and charcoal, and germination percentage and rate were assessed. In parallel, current and future ecological niche modeling was conducted using two different bioclimatic models. The results revealed differential responses. V. myrtillus was highly sensitive to fire, showing strong inhibition and no stimulation, while the other three species responded positively to moderate temperatures. Additionally, E. erigena and E. vagans also responded positively to smoke. The strongest inhibitions occurred under high temperatures and high concentrations of ash. Germination speed was only affected in E. erigena. Niche modeling indicates current overlaps among the species and significant future contractions. Overlaps with areas of high fire incidence were evident for most species, except for E. erigena, which showed the opposite trend. Integrating all findings, it is clear that V. myrtillus could face population declines. However, the other three species, which exhibit adaptive strategies to cope with fire, appear more resilient and may benefit in a future climate change scenario.
The Iberian Peninsula experiences a high incidence of wildfires, particularly in the northwest, with shrublands being the most affected ecosystems, accounting for nearly 60% of the burned area. The species associated with these formations are exposed to recurrent disturbances, impacting the seed bank and compromising regeneration. In the current context of climate change, a modification of the fire regime is expected, which will vary by region and could increase the exposure of certain species to this type of disturbance. In this regard, ecological niche modeling is a useful tool to analyze the potential overlap between species’ distribution areas and regions with a higher incidence of fire. This study aims to evaluate the response of four shrubland species (Cytisus commutatus, Erica erigena, Erica vagans, and Vaccinium myrtillus) to wildfires, integrating ecological niche analysis with germination response. To achieve this, an experiment was designed in which seeds were subjected to treatments involving temperature, smoke, ash, and charcoal, and germination percentage and rate were assessed. In parallel, current and future ecological niche modeling was conducted using two different bioclimatic models. The results revealed differential responses. V. myrtillus was highly sensitive to fire, showing strong inhibition and no stimulation, while the other three species responded positively to moderate temperatures. Additionally, E. erigena and E. vagans also responded positively to smoke. The strongest inhibitions occurred under high temperatures and high concentrations of ash. Germination speed was only affected in E. erigena. Niche modeling indicates current overlaps among the species and significant future contractions. Overlaps with areas of high fire incidence were evident for most species, except for E. erigena, which showed the opposite trend. Integrating all findings, it is clear that V. myrtillus could face population declines. However, the other three species, which exhibit adaptive strategies to cope with fire, appear more resilient and may benefit in a future climate change scenario.
Direction
REYES FERREIRA, OTILIA (Tutorships)
SERRANO PEREZ, LUIS MIGUEL (Co-tutorships)
Cruz de la Fuente, Óscar (Co-tutorships)
REYES FERREIRA, OTILIA (Tutorships)
SERRANO PEREZ, LUIS MIGUEL (Co-tutorships)
Cruz de la Fuente, Óscar (Co-tutorships)
Court
AMIGO VAZQUEZ, FRANCISCO JAVIER (Chairman)
LOPEZ RODRIGUEZ, Mª DEL CARMEN (Secretary)
REYES FERREIRA, OTILIA (Member)
AMIGO VAZQUEZ, FRANCISCO JAVIER (Chairman)
LOPEZ RODRIGUEZ, Mª DEL CARMEN (Secretary)
REYES FERREIRA, OTILIA (Member)
Quality, Traceability, and Environmental Department in a processing plant for a fish farm
Authorship
M.R.D.C.
Master in Aquaculture
M.R.D.C.
Master in Aquaculture
Defense date
06.13.2025 10:00
06.13.2025 10:00
Summary
This report focuses on and describes the various activities carried out during the internship period at the company Stolt Sea Farm (SSF), specifically at a processing plant within the Department of Quality, Traceability, and Environment. The following sections present various theoretical concepts related to quality, traceability, and food safety to provide context and a foundation for understanding the different activities and procedures carried out during the internship. Furthermore, this internship provides insight into how a processing and packaging plant operates, including the different stages of production from the reception of the fish and its handling to its subsequent transport and sale. The report also describes the various controls and procedures undertaken during the internship to ensure the quality, traceability, and food safety of SSF’s products
This report focuses on and describes the various activities carried out during the internship period at the company Stolt Sea Farm (SSF), specifically at a processing plant within the Department of Quality, Traceability, and Environment. The following sections present various theoretical concepts related to quality, traceability, and food safety to provide context and a foundation for understanding the different activities and procedures carried out during the internship. Furthermore, this internship provides insight into how a processing and packaging plant operates, including the different stages of production from the reception of the fish and its handling to its subsequent transport and sale. The report also describes the various controls and procedures undertaken during the internship to ensure the quality, traceability, and food safety of SSF’s products
Direction
BANDIN MATOS, MARIA ISABEL (Tutorships)
González García, Mª Luz (Co-tutorships)
BANDIN MATOS, MARIA ISABEL (Tutorships)
González García, Mª Luz (Co-tutorships)
Court
LAMAS FERNANDEZ, JESUS (Chairman)
MAGARIÑOS FERRO, BEATRIZ (Secretary)
PEREIRA DOPAZO, CARLOS (Member)
LAMAS FERNANDEZ, JESUS (Chairman)
MAGARIÑOS FERRO, BEATRIZ (Secretary)
PEREIRA DOPAZO, CARLOS (Member)
Niche modeling as a tool for the conservation of relict ferns Dryopteris guanchica Gibby et Jermy. and Dryopteris aemula (Aiton) Kuntze in the climate change.
Authorship
P.R.O.
Master in Terrestrial biodiversity: characterization, conservation and management
P.R.O.
Master in Terrestrial biodiversity: characterization, conservation and management
Defense date
02.21.2025 09:30
02.21.2025 09:30
Summary
Dryopteris guanchica and Dryopteris aemula are two relict pteridophyte species associated with humid forests with oceanic influence. In order to understand the factors that determine their distribution, this work approaches the characteristics of their bioclimatic niche by means of ecological niche modeling (ENM) to infer their possible past distribution since the late Pleistocene as well as their future distribution in different climate change scenarios. At the same time, the ecological niche was studied in greater geographic detail by means of ecosystem function attributes (EFAs), to evaluate aspects related to the conservation of the species. The revision of herbarium material, used to incorporate territorial presences to the models, revealed, apart from numerous incorrect determinations, the existence of D. guanchica specimens with an atypical morphology, whose niche was analyzed independently. The results show that D. aemula has always had a wider distribution along the European Atlantic arc, while D. guanchica has a more restricted and fragmented distribution. The island of Madeira, the island of Tenerife in the Canary Islands archipelago and the northwest coast of the Iberian Peninsula emerge as key potential refuges in the history of the two species.Future projections show significant contractions in currently occupied areas. The combination of habitat suitability and connectivity analysis identified critical areas for conservation, linked to optimal thermophilic oak woodland habitat quality, supporting the expansion of current conservation areas (SCAs) to ensure the preservation of these threatened ferns. These results highlight the vulnerability of relict ferns to climate change and the need to integrate ENMs and EFAs to improve conservation strategies.
Dryopteris guanchica and Dryopteris aemula are two relict pteridophyte species associated with humid forests with oceanic influence. In order to understand the factors that determine their distribution, this work approaches the characteristics of their bioclimatic niche by means of ecological niche modeling (ENM) to infer their possible past distribution since the late Pleistocene as well as their future distribution in different climate change scenarios. At the same time, the ecological niche was studied in greater geographic detail by means of ecosystem function attributes (EFAs), to evaluate aspects related to the conservation of the species. The revision of herbarium material, used to incorporate territorial presences to the models, revealed, apart from numerous incorrect determinations, the existence of D. guanchica specimens with an atypical morphology, whose niche was analyzed independently. The results show that D. aemula has always had a wider distribution along the European Atlantic arc, while D. guanchica has a more restricted and fragmented distribution. The island of Madeira, the island of Tenerife in the Canary Islands archipelago and the northwest coast of the Iberian Peninsula emerge as key potential refuges in the history of the two species.Future projections show significant contractions in currently occupied areas. The combination of habitat suitability and connectivity analysis identified critical areas for conservation, linked to optimal thermophilic oak woodland habitat quality, supporting the expansion of current conservation areas (SCAs) to ensure the preservation of these threatened ferns. These results highlight the vulnerability of relict ferns to climate change and the need to integrate ENMs and EFAs to improve conservation strategies.
Direction
SERRANO PEREZ, LUIS MIGUEL (Tutorships)
SERRANO PEREZ, LUIS MIGUEL (Tutorships)
Court
FERNANDEZ ESCRIBANO, JOSE ANGEL (Chairman)
BASELGA FRAGA, ANDRES (Secretary)
ROMERO BUJAN, MARIA INMACULADA (Member)
FERNANDEZ ESCRIBANO, JOSE ANGEL (Chairman)
BASELGA FRAGA, ANDRES (Secretary)
ROMERO BUJAN, MARIA INMACULADA (Member)
Beneath the Heat: Impact of Climate Stress and Habitat Fragmentation on Marine Benthic Ecosystems
Authorship
M.R.G.
Master in Marine Biology
M.R.G.
Master in Marine Biology
Defense date
02.25.2025 10:00
02.25.2025 10:00
Summary
Climate change-induced marine heatwaves (MHWs) and habitat fragmentation are increasingly recognised as key drivers of ecological shifts in marine benthic ecosystems. This study investigates the individual and interactive effects of MHWs and habitat fragmentation on community dynamics, recovery potential, and vulnerability to biological invasions. Using Autonomous Reef Monitoring Systems (ARMS), benthic samples were collected from Faro de las Puercas (Gulf of Cádiz) to establish baseline conditions. Subsequently, synthetic assemblages were exposed to controlled mesocosm experiments simulating moderate (24C) and extreme (28C) MHW scenarios alongside habitat Fragmentation treatments. Finally, non-fragmented assemblages were deployed in a marina environment to assess post-disturbance recovery under natural conditions. Results from the mesocosm phase revealed that MHWs and fragmentation significantly influenced benthic community composition but had no significant effect on species richness or diversity indices. Fragmentation modified species distribution, increasing community heterogeneity without necessarily reducing biodiversity. No clear synergistic interaction between MHWs and fragmentation was observed, suggesting these stressors act independently. The post-experimental marina phase revealed the recruitment of five new species, including Bugula neritina (Linnaeus, 1758) and Clavelina cf. oblonga Herdman, 1880. Overall, the findings highlight that while MHWs alter species composition and habitat fragmentation reshapes structural heterogeneity, their combined impact does not exacerbate these effects. The lack of significant interactions between these stressors suggests that community responses may be mediated by species-specific tolerances rather than purely additive or synergistic effects.
Climate change-induced marine heatwaves (MHWs) and habitat fragmentation are increasingly recognised as key drivers of ecological shifts in marine benthic ecosystems. This study investigates the individual and interactive effects of MHWs and habitat fragmentation on community dynamics, recovery potential, and vulnerability to biological invasions. Using Autonomous Reef Monitoring Systems (ARMS), benthic samples were collected from Faro de las Puercas (Gulf of Cádiz) to establish baseline conditions. Subsequently, synthetic assemblages were exposed to controlled mesocosm experiments simulating moderate (24C) and extreme (28C) MHW scenarios alongside habitat Fragmentation treatments. Finally, non-fragmented assemblages were deployed in a marina environment to assess post-disturbance recovery under natural conditions. Results from the mesocosm phase revealed that MHWs and fragmentation significantly influenced benthic community composition but had no significant effect on species richness or diversity indices. Fragmentation modified species distribution, increasing community heterogeneity without necessarily reducing biodiversity. No clear synergistic interaction between MHWs and fragmentation was observed, suggesting these stressors act independently. The post-experimental marina phase revealed the recruitment of five new species, including Bugula neritina (Linnaeus, 1758) and Clavelina cf. oblonga Herdman, 1880. Overall, the findings highlight that while MHWs alter species composition and habitat fragmentation reshapes structural heterogeneity, their combined impact does not exacerbate these effects. The lack of significant interactions between these stressors suggests that community responses may be mediated by species-specific tolerances rather than purely additive or synergistic effects.
Direction
DOMINGUEZ CONDE, JESUS (Tutorships)
Gestoso García, Ignacio José (Co-tutorships)
Carmona Barnosi, Leila María (Co-tutorships)
DOMINGUEZ CONDE, JESUS (Tutorships)
Gestoso García, Ignacio José (Co-tutorships)
Carmona Barnosi, Leila María (Co-tutorships)
Court
BESTEIRO RODRIGUEZ, MARIA CELIA (Chairman)
BALBOA MENDEZ, SABELA (Secretary)
Rodriguez Diaz, Miguel Angel (Member)
BESTEIRO RODRIGUEZ, MARIA CELIA (Chairman)
BALBOA MENDEZ, SABELA (Secretary)
Rodriguez Diaz, Miguel Angel (Member)
Memories of Avramar
Authorship
S.R.S.
Master in Aquaculture
S.R.S.
Master in Aquaculture
Defense date
02.11.2025 12:00
02.11.2025 12:00
Summary
Report on external internships in the Avramar company located in the province of Alicante, Valencian Community, during the months of September and January (2024 - 2025). In the company, croaker, sea bream and sea bass species are grown in a total of 48 cages, some 25 meters in diameter and others 38 meters in diameter. Feeding is automated from a platform - silo located within the offshore facility. In this, the feed is loaded into different tanks depending on the type of feed and the size of the pellet. The feed is directed from the office or from the platform itself. Finally, I was lucky enough to participate in all the maneuvers carried out on the farm, such as fishing or planting fingerlings.
Report on external internships in the Avramar company located in the province of Alicante, Valencian Community, during the months of September and January (2024 - 2025). In the company, croaker, sea bream and sea bass species are grown in a total of 48 cages, some 25 meters in diameter and others 38 meters in diameter. Feeding is automated from a platform - silo located within the offshore facility. In this, the feed is loaded into different tanks depending on the type of feed and the size of the pellet. The feed is directed from the office or from the platform itself. Finally, I was lucky enough to participate in all the maneuvers carried out on the farm, such as fishing or planting fingerlings.
Direction
BANDIN MATOS, MARIA ISABEL (Tutorships)
Gil Cardona, Daniel (Co-tutorships)
BANDIN MATOS, MARIA ISABEL (Tutorships)
Gil Cardona, Daniel (Co-tutorships)
Court
LAMAS FERNANDEZ, JESUS (Chairman)
MAGARIÑOS FERRO, BEATRIZ (Secretary)
SANTOS RODRIGUEZ, MARIA ISABEL (Member)
LAMAS FERNANDEZ, JESUS (Chairman)
MAGARIÑOS FERRO, BEATRIZ (Secretary)
SANTOS RODRIGUEZ, MARIA ISABEL (Member)
Bird biodiversity in pure and mixed habitats of Quercus robur and Eucalyptus globulus in the province of Pontevedra.
Authorship
E.R.F.
Master in Terrestrial biodiversity: characterization, conservation and management
E.R.F.
Master in Terrestrial biodiversity: characterization, conservation and management
Defense date
02.21.2025 09:30
02.21.2025 09:30
Summary
As forested habitats in Galicia have developed over the past decades towards a rise of plantations for production purposes, different articles have addressed the topic of the effect of native forested habitats and plantations on biodiversity. Nevertheless, there has been little attention towards mixed habitats, comprising of a mixture of autochthonous and alien species. This study analyses the differences between species abundance, richness and composition across a range of four types of forested habitats: eucalyptus globulus plantations (EP), oak forests (CP, dominated by Quercus robur), and mixed forested habitats: oak forests with dispersed eucalyptus (CM) and eucalyptus plantations with dispersed oaks (EM). To carry out this study, bird vocalizations were registered with audio recorders throughout 32 sites, 8 sites for each type of habitat, at different moments during the day. From the samples collected, the number and duration of the vocalizations were gathered for each site as a measure of species abundance, and species were identified from each recording to obtain values of species richness and species composition for each site. After collecting the data, different statistical analyses were made for studying species abundance and richness (ANOVA, Fisher’s test and Tukey’s test), rarefaction curves and Chao2 indicator were used, and different analyses were made to study species composition (ANOSIM, NMDS and CDA). These analyses revealed that the habitat has a significant effect on species richness, number of vocalizations and species composition, but not on the duration of vocalizations. Mixed formations, CM and EM, had the highest abundance and highest alpha richness, but these values aren’t significantly different compared to oak forests. Nevertheless, there are significant differences between EP and the other habitats (with all of them or only with CM and EM, depending on the statistical analysis used). EP had the lowest abundance and lowest alpha richness, although its total richness wasn’t the lowest. Moreover, EP has the biggest difference in species composition compared to the rest of the habitats. It has species related to shrubs and adapted to human disturbed habitats, and it shows lower relative frequence of specialist and generalist forest bird species. The surprising capacity of mixed forested habitats to harbour bird biodiversity shown in this study, invites to reflect upon their effect on regional biodiversity conservation and on the implications these results have for forest management, when knowing that eucalypts have proven to have negative effects on ecosystems as they behave as an invasive species in Southern Europe. Results showing significant improvement of bird communities in eucalypt plantations and mixed habitats encourage to aim forest management measures in that direction, which could in turn have a considerable effect on biodiversity on these plantations, reducing its negative impact significantly. Future research can focus on improving the actual knowledge on mixed forested habitats in Galicia, studying their effects on other taxonomic groups.
As forested habitats in Galicia have developed over the past decades towards a rise of plantations for production purposes, different articles have addressed the topic of the effect of native forested habitats and plantations on biodiversity. Nevertheless, there has been little attention towards mixed habitats, comprising of a mixture of autochthonous and alien species. This study analyses the differences between species abundance, richness and composition across a range of four types of forested habitats: eucalyptus globulus plantations (EP), oak forests (CP, dominated by Quercus robur), and mixed forested habitats: oak forests with dispersed eucalyptus (CM) and eucalyptus plantations with dispersed oaks (EM). To carry out this study, bird vocalizations were registered with audio recorders throughout 32 sites, 8 sites for each type of habitat, at different moments during the day. From the samples collected, the number and duration of the vocalizations were gathered for each site as a measure of species abundance, and species were identified from each recording to obtain values of species richness and species composition for each site. After collecting the data, different statistical analyses were made for studying species abundance and richness (ANOVA, Fisher’s test and Tukey’s test), rarefaction curves and Chao2 indicator were used, and different analyses were made to study species composition (ANOSIM, NMDS and CDA). These analyses revealed that the habitat has a significant effect on species richness, number of vocalizations and species composition, but not on the duration of vocalizations. Mixed formations, CM and EM, had the highest abundance and highest alpha richness, but these values aren’t significantly different compared to oak forests. Nevertheless, there are significant differences between EP and the other habitats (with all of them or only with CM and EM, depending on the statistical analysis used). EP had the lowest abundance and lowest alpha richness, although its total richness wasn’t the lowest. Moreover, EP has the biggest difference in species composition compared to the rest of the habitats. It has species related to shrubs and adapted to human disturbed habitats, and it shows lower relative frequence of specialist and generalist forest bird species. The surprising capacity of mixed forested habitats to harbour bird biodiversity shown in this study, invites to reflect upon their effect on regional biodiversity conservation and on the implications these results have for forest management, when knowing that eucalypts have proven to have negative effects on ecosystems as they behave as an invasive species in Southern Europe. Results showing significant improvement of bird communities in eucalypt plantations and mixed habitats encourage to aim forest management measures in that direction, which could in turn have a considerable effect on biodiversity on these plantations, reducing its negative impact significantly. Future research can focus on improving the actual knowledge on mixed forested habitats in Galicia, studying their effects on other taxonomic groups.
Direction
Calviño Cancela, María (Tutorships)
Martín Herrero, Julio (Co-tutorships)
Calviño Cancela, María (Tutorships)
Martín Herrero, Julio (Co-tutorships)
Court
FERNANDEZ ESCRIBANO, JOSE ANGEL (Chairman)
BASELGA FRAGA, ANDRES (Secretary)
ROMERO BUJAN, MARIA INMACULADA (Member)
FERNANDEZ ESCRIBANO, JOSE ANGEL (Chairman)
BASELGA FRAGA, ANDRES (Secretary)
ROMERO BUJAN, MARIA INMACULADA (Member)
Modeling the Probability of Forest Fire Occurrence in the Municipality of Villaflores
Authorship
A.P.S.C.
Master in Terrestrial biodiversity: characterization, conservation and management
A.P.S.C.
Master in Terrestrial biodiversity: characterization, conservation and management
Defense date
06.27.2025 12:00
06.27.2025 12:00
Summary
The municipality of Villaflores, Chiapas, located in a high-density forest fire cluster in Mexico, has faced an increase in the frequency and burned area of fires between 2019 and 2024, surpassing the averages for 2012 to 2024, especially in coniferous and montane cloud forests. This study modeled the probability of forest fire occurrence (2012 to 2024) using logistic regression, incorporating topoclimatic predictors (e.g., wind speed), landscape predictors (e.g., green biomass density, forest-agriculture interface), and demographic predictors (e.g., population density). A fire probability map was generated, and the relative importance of the predictors was assessed. The model, evaluated over 100 iterations, showed useful discriminatory capacity (mean AUC ROC 0.791, standard deviation 0.018), but low positive predictive value (34%), indicating better identification of environmentally susceptible areas than of precise ignitions. The most influential predictors were green biomass density (WDVI.Q3, 15% decrease in AUC ROC when excluded), herbaceous layer density (MSAVI .Q1, 10%), percentage of affected forest (Perc.Des), and wind speed (Wind). Interactions between anthropogenic and landscape variables are key to analyzing the two areas of maximum probability: West (85%, conifers, low accessibility) and East (95%, cloud forest, atypical fires in February) near population centers. Limitations include the 1 km2 resolution, which smooths local variations, and the exclusion of fire records without burned area polygons, potentially biasing spatial patterns.
The municipality of Villaflores, Chiapas, located in a high-density forest fire cluster in Mexico, has faced an increase in the frequency and burned area of fires between 2019 and 2024, surpassing the averages for 2012 to 2024, especially in coniferous and montane cloud forests. This study modeled the probability of forest fire occurrence (2012 to 2024) using logistic regression, incorporating topoclimatic predictors (e.g., wind speed), landscape predictors (e.g., green biomass density, forest-agriculture interface), and demographic predictors (e.g., population density). A fire probability map was generated, and the relative importance of the predictors was assessed. The model, evaluated over 100 iterations, showed useful discriminatory capacity (mean AUC ROC 0.791, standard deviation 0.018), but low positive predictive value (34%), indicating better identification of environmentally susceptible areas than of precise ignitions. The most influential predictors were green biomass density (WDVI.Q3, 15% decrease in AUC ROC when excluded), herbaceous layer density (MSAVI .Q1, 10%), percentage of affected forest (Perc.Des), and wind speed (Wind). Interactions between anthropogenic and landscape variables are key to analyzing the two areas of maximum probability: West (85%, conifers, low accessibility) and East (95%, cloud forest, atypical fires in February) near population centers. Limitations include the 1 km2 resolution, which smooths local variations, and the exclusion of fire records without burned area polygons, potentially biasing spatial patterns.
Direction
DIAZ VARELA, RAMON ALBERTO (Tutorships)
REGOS SANZ, ADRIAN (Co-tutorships)
Vega Nieva, Daniel José (Co-tutorships)
DIAZ VARELA, RAMON ALBERTO (Tutorships)
REGOS SANZ, ADRIAN (Co-tutorships)
Vega Nieva, Daniel José (Co-tutorships)
Court
AMIGO VAZQUEZ, FRANCISCO JAVIER (Chairman)
LOPEZ RODRIGUEZ, Mª DEL CARMEN (Secretary)
REYES FERREIRA, OTILIA (Member)
AMIGO VAZQUEZ, FRANCISCO JAVIER (Chairman)
LOPEZ RODRIGUEZ, Mª DEL CARMEN (Secretary)
REYES FERREIRA, OTILIA (Member)
Abundance and diversity of demersal species in the northwest Galician coast (2017-2022)
Authorship
R.S.A.
Master in Marine Biology
R.S.A.
Master in Marine Biology
Defense date
02.25.2025 10:00
02.25.2025 10:00
Summary
This study analyzed the abundance and diversity patterns of the demersal species community along the northwest coast of Galicia, linking them with environmental, temporal, and spatial factors. Data from the Cigala Sentinel Campaigns conducted between 2017 and 2022 were used, covering a bathymetric range between 111 and 530 m. Abundance analyses were performed for the entire community and separately for each of the described taxonomic groups: osteichthyes, chondrichthyes, crustaceans, cephalopods, echinoderms, and others. All groups showed a significant relationship with depth, but no effect was observed for the entire community as a whole. Over the time series, a significant increase in general abundance and by group was detected, although methodological limitations should be considered when interpreting the results. The fishing area El Fondón and the northern part of Cape Finisterre recorded the highest diversity points in our study, with the latter being an area characterized by strong upwellings that result in high primary productivity.
This study analyzed the abundance and diversity patterns of the demersal species community along the northwest coast of Galicia, linking them with environmental, temporal, and spatial factors. Data from the Cigala Sentinel Campaigns conducted between 2017 and 2022 were used, covering a bathymetric range between 111 and 530 m. Abundance analyses were performed for the entire community and separately for each of the described taxonomic groups: osteichthyes, chondrichthyes, crustaceans, cephalopods, echinoderms, and others. All groups showed a significant relationship with depth, but no effect was observed for the entire community as a whole. Over the time series, a significant increase in general abundance and by group was detected, although methodological limitations should be considered when interpreting the results. The fishing area El Fondón and the northern part of Cape Finisterre recorded the highest diversity points in our study, with the latter being an area characterized by strong upwellings that result in high primary productivity.
Direction
DOMINGUEZ CONDE, JESUS (Tutorships)
Otero Villar, Jaime (Co-tutorships)
González Herraiz, Isabel (Co-tutorships)
DOMINGUEZ CONDE, JESUS (Tutorships)
Otero Villar, Jaime (Co-tutorships)
González Herraiz, Isabel (Co-tutorships)
Court
BESTEIRO RODRIGUEZ, MARIA CELIA (Chairman)
BALBOA MENDEZ, SABELA (Secretary)
Rodriguez Diaz, Miguel Angel (Member)
BESTEIRO RODRIGUEZ, MARIA CELIA (Chairman)
BALBOA MENDEZ, SABELA (Secretary)
Rodriguez Diaz, Miguel Angel (Member)