Some seabird species have learnt to efficiently exploit fishing discards from trawling activities... more Some seabird species have learnt to efficiently exploit fishing discards from trawling activities. However, a discard ban has been proposed as necessary in Europe to ensure the sustainability of the seas. It is of crucial importance for the management and conservation purposes to study the potential consequences of a discard ban on the foraging ecology of threatened seabirds. We assessed the influence of fishing activities on the feeding habits of 22 male and 15 female Audouin's gulls (Larus audouinii) from the Ebro Delta (Mediterranean Sea) during the breeding period using GPS loggers together with Stable Isotope Analysis (SIA), which provided new insights into their foraging behavior and trophic ecology, respectively. GPS data revealed different sex-specific foraging patterns between workdays and weekends. Females were highly consistent in that they foraged at sea throughout the week even though discarding stops at weekends. In contrast, males switched from foraging at sea dur...
Seabirds are facing a growing number of threats in both terrestrial and marine habitats, and many... more Seabirds are facing a growing number of threats in both terrestrial and marine habitats, and many populations have experienced dramatic changes over past decades. Years of seabird research have improved our understanding of seabird populations and provided a broader understanding of marine ecological processes. In an effort to encourage future research and guide seabird conservation science, seabird researchers from 9 nations identified the 20 highest priority research questions and organized these into 6 general categories: (1) population dynamics, (2) spatial ecology, (3) tropho-dynamics, (4) fisheries interactions, (5) response to global change, and (6) management of anthropogenic impacts (focusing on invasive species, contaminants and protected areas). For each category, we provide an assessment of the current approaches, challenges and future directions. While this is not an exhaustive list of all research needed to address the myriad conservation challenges seabirds face, the results of this effort represent an important synthesis of current expert opinion across sub-disciplines within seabird ecology. As this synthesis highlights, research, in conjunction with direct management, education, and community engagement, can play an important role in facilitating the conservation and management of seabird populations and of the ocean ecosystems on which they and we depend.
A partir de esta entrega, cambia el formato de la sección. Desde sus inicios, cada entrega presen... more A partir de esta entrega, cambia el formato de la sección. Desde sus inicios, cada entrega presentaba un listado de títulos de revistas para las cuales se había revisado una serie de años, presentando resúmenes de todos los artículos que entraran dentro de los objetivos de la misma. Sin embargo, el enorme aumento de los artículos publicados sobre Ornitología por ornitólogos españoles, principalmente, y también en el área mediterránea, y el mayor número de títulos en los que se han venido publicando trabajos de interés para la sección, han aconsejado que cambiemos el enfoque. A partir de ahora se intentará presentar resúmenes de los artículos más relevantes, encontrados a partir de búsquedas en las base de datos (por ej. Zoological Records). De esta manera, la sección pasará a mostrar una selección de los artículos con mayor interés, presentando todos los otros no resumidos, como citaciones bibliográficas, en la web que SEO destinará, dentro de la sección de la revista Ardeola, a esta sección. En la presente entrega se recogen los artículos publicados en el año 2002.-JLC.
Although the breeding ecology of Audouin's gull has been widely studied, its spatial distribu... more Although the breeding ecology of Audouin's gull has been widely studied, its spatial distribution patterns have received little attention. We assessed the foraging movements of 36 GPS-tracked adult Audouin's gulls breeding at the Ebro Delta (NW Mediterranean), coinciding with the incubation period (May 2011). This also coincided with a trawling moratorium northwards from the colony. We modelled the distribution of the gulls by combining these tracking data with environmental variables (including fishing activities from Vessel Monitoring System, VMS), using Maxent. The modelling range included both marine and terrestrial areas. Models were produced separately for every 2h time interval across the day, and for 2 fishing activity scenarios (workdays vs. weekends), allowing to assess the spatio-temporal distribution patterns of the gulls and the degree of association with fisheries. During workdays, gull distribution at sea fully matched with fishing activities, both trawling (d...
The Balearic shearwater Puffinus mauretanicus is the most threatened seabird in Europe. Several r... more The Balearic shearwater Puffinus mauretanicus is the most threatened seabird in Europe. Several recent research and conservation programmes from different countries (Spain, Portugal, France, UK and Ireland), using various methodologies such as colony monitoring, at-sea surveys, tracking and coastal censuses, brought new information about the population status, behaviour and threats of the species. The global population can now be estimated in over 25,000 individuals, roughly twice than previous estimation. Mean extinction time is also revised to 70-80 years. For the first time, birds from Eivissa (i.e. the southern breeding population) were tracked and breeders appear to forage not only on the Iberian shelf and around breeding sites, but also in North African waters, seeking marine productive waters. During wintering, Balearic shearwaters appear to restrict their activity to few core areas off western Iberia or south-western Brittany. Some of the French coastal survey sites host large numbers of individuals (> 5,000 observed in Brittany in 2010) and should integrate the MPA network. Tracking surveys of breeders and of moulting adults caught-at-sea show that they can directly return to their breeding sites as early as 5 months before the beginning of the breeding season (egg laying, which takes place in early March). Data from observers onboard fishing vessels and questionnaires to fishermen show that bycatch is a big issue for the species in both the Mediterranean and the Atlantic area. Preliminary results suggest that Mediterranean bycatch mainly occur in longlining, whereas purse-seiners and trawlers could capture more birds in the NE Atlantic. Further work is required in order to obtain bycatch rates on a more representative fleet. The highly mobile Balearic shearwater is not attached to administrative boundaries and it is therefore essential to overcome legal limitations to provide its efficient protection. Transboundary programmes such as the Interreg FAME should be rapidly encouraged to provide efficient conservation measures for Puffinus mauretanicus. PCSWG1 Doc 15 Agenda Items 5,6 3 PCSWG1 Doc 15 Agenda Items 5,6 4 PCSWG1 Doc 15 Agenda Items 5,6 5
RESUMEN. Resultados preliminares sobre el hábitat de alimentación de la Pardela Balear en el Leva... more RESUMEN. Resultados preliminares sobre el hábitat de alimentación de la Pardela Balear en el Levante Ibérico Peninsular. Las aves marinas son suscep- tibles a una variedad de impactos antropogénicos, incluyendo la ingestión de plásticos, vertidos de petróleo, competencia con la pesca y la captura incidental. Conocer su distribución en el mar puede ayudar a los gestores a evaluar la sus-
Pelagic seabirds obtain food from oceans where the availability of their prey changes rapidly bot... more Pelagic seabirds obtain food from oceans where the availability of their prey changes rapidly both seasonally and spatially. Here, we investigated changes in the trophic habits of the critically endangered Balearic shearwater (PuYnus mauretanicus) through the breeding season and tested for dietary diVerences between sexes and age classes. We analysed 15 N and 13 C values in blood of adults during the pre-incubation, incubation and chick-rearing periods and of their chicks. Using a two-isotope mixing model, we estimated dietary contributions based on isotope values from potential prey species which included small pelagic species available naturally and demersal Wsh species available only from trawling discards. Balearic shearwaters showed clear isotopic and dietary variation through the breeding season. During pre-incubation, breeding adults appeared to exploit demersal Wsh, whereas during the incubation and chick-rearing period, they fed mainly on pelagic anchovies (Engraulis encrasicolus) and pilchards (Sardina pilchardus). Similarly, chicks were fed mainly with anchovies, a resource with a high energetic value. This variation in the dietary habits of adult shearwaters during the breeding season was probably related to both natural and Wsheryinduced seasonal changes in the availability of potential prey species within their main feeding grounds. However, changes in the nutritional requirements of the shearwaters could also play an important role. Indeed, diet diVered between sexes during pre-incubation: females fed less on trawling discards and more on small pelagic Wsh than males. This sexual segregation in diet could be the consequence of higher nutritional requirements of females during this period. Our study reveals the diVerential importance of both trawling discards and small pelagic Wsh species for a pelagic seabird depending on the breeding period and illustrates the importance of considering the entire breeding season when making inferences about the importance of speciWc prey in seabird dietary studies. Communicated by R. Lewison.
Competition between the yellow-legged gull Larus cachinnans and Audouin's gull Larus audouinii wh... more Competition between the yellow-legged gull Larus cachinnans and Audouin's gull Larus audouinii while foraging at commercial ®shing vessels o the Ebro Delta (NW Mediterranean) was assessed in 1997 and 1998. Observations were performed on board two kinds of ®shing vessels with dierent timetables: bottom trawlers (diurnal activity) and purse seiners (nocturnal activity). Three situations were distinguished with respect to the season and the ®shing regime: (1) breeding season, both¯eets operating; (2) breeding season, only purse seiners operating due to a trawling moratorium;
Competition for food is widely cited as an important cost of coloniality among birds and much of ... more Competition for food is widely cited as an important cost of coloniality among birds and much of the evidence in support of this hypothesis comes from studies of colonial piscivorous seabirds. However, for generalist seabirds able to switch between different prey types, the role of food availability in relation to colony size is unclear. Here we investigate patterns of the consumption of seabird prey in relation to colony size in a generalist seabird, the great skua Stercorarius skua , in Shetland, UK. At the population level skuas feed mainly on sandeels Ammodytes marinus and fishery discards, but respond to declines in fish availability to facultatively prey on other seabirds. By comparing the consumption of seabirds among seven different sized colonies, including one colony with artificially reduced numbers of skuas (Fair Isle), we investigate whether consumption of seabird prey is influenced by skua population size, while simultaneously measuring seabird prey availability. Data from five years also enables us to investigate the influence of annual variation in environmental conditions on seabird consumption. Using measures of body condition and reproductive performance we investigate the consequences of living in different sized colonies, which may provide insight into ultimate costs of nesting at high population density. Skua diets varied among colonies and the proportion of seabird prey in the diet was inversely related to skua colony size, despite similar per capita numbers of seabirds across colonies. At the colony where their numbers were artificially suppressed, skuas consumed a greater proportion of seabirds per capita. Highly significant year effects in seabird predation were observed but the pattern among colonies remained consistent over time. Two measures of adult body condition (pectoral muscle index and mean corpuscular volume) revealed that adult great skuas were in poorer condition at the largest colony (Foula), but reproductive performance did not alter significantly among colonies. This study provides evidence that intra-specific competition among skuas may limit opportunities for obtaining seabird prey, which may be particularly important during periods of poor availability of sandeels and fishery discards, and has implications for assessing the impact of skuas on seabird populations.
Aim Apical pelagic species forage in predictable habitats, and their movements should signal biol... more Aim Apical pelagic species forage in predictable habitats, and their movements should signal biologically and ecologically significant areas of the marine ecosystem. Several countries are now engaged in identifying these areas based on animal tracking, but this is often limited to a few individuals from one breeding population, which may result in biased portrayals of the key marine habitats. To help identify such foraging areas, we compiled tracking data of a marine top predator from the main breeding colonies in the Central Macaronesia.
Capsule The breeding foraging and post-breeding dispersal movements of five satellite-tagged Bulw... more Capsule The breeding foraging and post-breeding dispersal movements of five satellite-tagged Bulwer's Petrels from the Canary Islands were recorded. Foraging trips lasted 5.6 days in average (n = 3), while the mean distance covered was 1261 km, and foraging areas were located over the continental slope and the adjacent pelagic waters, around 1200-2000 m depth and up to 350 km from the colony. After the chickrearing period, birds dispersed southwestwards to the tropical waters of the central Atlantic.
... 1985). 10s dias elegides para realizar 10s censos se corresponden con el ... De todas mane-ra... more ... 1985). 10s dias elegides para realizar 10s censos se corresponden con el ... De todas mane-ras, y considerando el nivel a que se quieren comparar 10s datos, 10s resultados de 10s censos pueden ... In Ros, J., Olivella, I. & Gilli, JM (eds.): Els sistemes naturals de les illes Medes. ...
RESUM.-Biologia de la conservació d'un ocell críticament amenaçat: la baldritja Puff... more RESUM.-Biologia de la conservació d'un ocell críticament amenaçat: la baldritja Puffinus mauretanicus. Una de les aus marines més amenaçades de la Mediterrània és la baldritja Puffinus mauretanicus. El present article resumeix l'estudi de la seva problemàtica de ...
El objetivo de este trabajo ha sido elaborar un diagnóstico de conservación para una especie en p... more El objetivo de este trabajo ha sido elaborar un diagnóstico de conservación para una especie en peligro de extinción, la pardela Balear (Puffinus mauretanicus) en el marco del Parque Nacional de Cabrera. Para completar conocimientos se ha dispuesto de datos históricos y de muestras de otras colonias con las que indirectamente se pueden valorar problemas comunes de conservación de la especie, pues las colonias del Parque son pequeñas y más sensibles pues a los efectos de la investigación. Hemos indagado sobre los siguientes aspectos: a) ecología de poblaciones, b) ecología trófica, c) hábitat oceanográfico y d) concentración de contaminantes (mercurio).
Some seabird species have learnt to efficiently exploit fishing discards from trawling activities... more Some seabird species have learnt to efficiently exploit fishing discards from trawling activities. However, a discard ban has been proposed as necessary in Europe to ensure the sustainability of the seas. It is of crucial importance for the management and conservation purposes to study the potential consequences of a discard ban on the foraging ecology of threatened seabirds. We assessed the influence of fishing activities on the feeding habits of 22 male and 15 female Audouin's gulls (Larus audouinii) from the Ebro Delta (Mediterranean Sea) during the breeding period using GPS loggers together with Stable Isotope Analysis (SIA), which provided new insights into their foraging behavior and trophic ecology, respectively. GPS data revealed different sex-specific foraging patterns between workdays and weekends. Females were highly consistent in that they foraged at sea throughout the week even though discarding stops at weekends. In contrast, males switched from foraging at sea dur...
Seabirds are facing a growing number of threats in both terrestrial and marine habitats, and many... more Seabirds are facing a growing number of threats in both terrestrial and marine habitats, and many populations have experienced dramatic changes over past decades. Years of seabird research have improved our understanding of seabird populations and provided a broader understanding of marine ecological processes. In an effort to encourage future research and guide seabird conservation science, seabird researchers from 9 nations identified the 20 highest priority research questions and organized these into 6 general categories: (1) population dynamics, (2) spatial ecology, (3) tropho-dynamics, (4) fisheries interactions, (5) response to global change, and (6) management of anthropogenic impacts (focusing on invasive species, contaminants and protected areas). For each category, we provide an assessment of the current approaches, challenges and future directions. While this is not an exhaustive list of all research needed to address the myriad conservation challenges seabirds face, the results of this effort represent an important synthesis of current expert opinion across sub-disciplines within seabird ecology. As this synthesis highlights, research, in conjunction with direct management, education, and community engagement, can play an important role in facilitating the conservation and management of seabird populations and of the ocean ecosystems on which they and we depend.
A partir de esta entrega, cambia el formato de la sección. Desde sus inicios, cada entrega presen... more A partir de esta entrega, cambia el formato de la sección. Desde sus inicios, cada entrega presentaba un listado de títulos de revistas para las cuales se había revisado una serie de años, presentando resúmenes de todos los artículos que entraran dentro de los objetivos de la misma. Sin embargo, el enorme aumento de los artículos publicados sobre Ornitología por ornitólogos españoles, principalmente, y también en el área mediterránea, y el mayor número de títulos en los que se han venido publicando trabajos de interés para la sección, han aconsejado que cambiemos el enfoque. A partir de ahora se intentará presentar resúmenes de los artículos más relevantes, encontrados a partir de búsquedas en las base de datos (por ej. Zoological Records). De esta manera, la sección pasará a mostrar una selección de los artículos con mayor interés, presentando todos los otros no resumidos, como citaciones bibliográficas, en la web que SEO destinará, dentro de la sección de la revista Ardeola, a esta sección. En la presente entrega se recogen los artículos publicados en el año 2002.-JLC.
Although the breeding ecology of Audouin's gull has been widely studied, its spatial distribu... more Although the breeding ecology of Audouin's gull has been widely studied, its spatial distribution patterns have received little attention. We assessed the foraging movements of 36 GPS-tracked adult Audouin's gulls breeding at the Ebro Delta (NW Mediterranean), coinciding with the incubation period (May 2011). This also coincided with a trawling moratorium northwards from the colony. We modelled the distribution of the gulls by combining these tracking data with environmental variables (including fishing activities from Vessel Monitoring System, VMS), using Maxent. The modelling range included both marine and terrestrial areas. Models were produced separately for every 2h time interval across the day, and for 2 fishing activity scenarios (workdays vs. weekends), allowing to assess the spatio-temporal distribution patterns of the gulls and the degree of association with fisheries. During workdays, gull distribution at sea fully matched with fishing activities, both trawling (d...
The Balearic shearwater Puffinus mauretanicus is the most threatened seabird in Europe. Several r... more The Balearic shearwater Puffinus mauretanicus is the most threatened seabird in Europe. Several recent research and conservation programmes from different countries (Spain, Portugal, France, UK and Ireland), using various methodologies such as colony monitoring, at-sea surveys, tracking and coastal censuses, brought new information about the population status, behaviour and threats of the species. The global population can now be estimated in over 25,000 individuals, roughly twice than previous estimation. Mean extinction time is also revised to 70-80 years. For the first time, birds from Eivissa (i.e. the southern breeding population) were tracked and breeders appear to forage not only on the Iberian shelf and around breeding sites, but also in North African waters, seeking marine productive waters. During wintering, Balearic shearwaters appear to restrict their activity to few core areas off western Iberia or south-western Brittany. Some of the French coastal survey sites host large numbers of individuals (> 5,000 observed in Brittany in 2010) and should integrate the MPA network. Tracking surveys of breeders and of moulting adults caught-at-sea show that they can directly return to their breeding sites as early as 5 months before the beginning of the breeding season (egg laying, which takes place in early March). Data from observers onboard fishing vessels and questionnaires to fishermen show that bycatch is a big issue for the species in both the Mediterranean and the Atlantic area. Preliminary results suggest that Mediterranean bycatch mainly occur in longlining, whereas purse-seiners and trawlers could capture more birds in the NE Atlantic. Further work is required in order to obtain bycatch rates on a more representative fleet. The highly mobile Balearic shearwater is not attached to administrative boundaries and it is therefore essential to overcome legal limitations to provide its efficient protection. Transboundary programmes such as the Interreg FAME should be rapidly encouraged to provide efficient conservation measures for Puffinus mauretanicus. PCSWG1 Doc 15 Agenda Items 5,6 3 PCSWG1 Doc 15 Agenda Items 5,6 4 PCSWG1 Doc 15 Agenda Items 5,6 5
RESUMEN. Resultados preliminares sobre el hábitat de alimentación de la Pardela Balear en el Leva... more RESUMEN. Resultados preliminares sobre el hábitat de alimentación de la Pardela Balear en el Levante Ibérico Peninsular. Las aves marinas son suscep- tibles a una variedad de impactos antropogénicos, incluyendo la ingestión de plásticos, vertidos de petróleo, competencia con la pesca y la captura incidental. Conocer su distribución en el mar puede ayudar a los gestores a evaluar la sus-
Pelagic seabirds obtain food from oceans where the availability of their prey changes rapidly bot... more Pelagic seabirds obtain food from oceans where the availability of their prey changes rapidly both seasonally and spatially. Here, we investigated changes in the trophic habits of the critically endangered Balearic shearwater (PuYnus mauretanicus) through the breeding season and tested for dietary diVerences between sexes and age classes. We analysed 15 N and 13 C values in blood of adults during the pre-incubation, incubation and chick-rearing periods and of their chicks. Using a two-isotope mixing model, we estimated dietary contributions based on isotope values from potential prey species which included small pelagic species available naturally and demersal Wsh species available only from trawling discards. Balearic shearwaters showed clear isotopic and dietary variation through the breeding season. During pre-incubation, breeding adults appeared to exploit demersal Wsh, whereas during the incubation and chick-rearing period, they fed mainly on pelagic anchovies (Engraulis encrasicolus) and pilchards (Sardina pilchardus). Similarly, chicks were fed mainly with anchovies, a resource with a high energetic value. This variation in the dietary habits of adult shearwaters during the breeding season was probably related to both natural and Wsheryinduced seasonal changes in the availability of potential prey species within their main feeding grounds. However, changes in the nutritional requirements of the shearwaters could also play an important role. Indeed, diet diVered between sexes during pre-incubation: females fed less on trawling discards and more on small pelagic Wsh than males. This sexual segregation in diet could be the consequence of higher nutritional requirements of females during this period. Our study reveals the diVerential importance of both trawling discards and small pelagic Wsh species for a pelagic seabird depending on the breeding period and illustrates the importance of considering the entire breeding season when making inferences about the importance of speciWc prey in seabird dietary studies. Communicated by R. Lewison.
Competition between the yellow-legged gull Larus cachinnans and Audouin's gull Larus audouinii wh... more Competition between the yellow-legged gull Larus cachinnans and Audouin's gull Larus audouinii while foraging at commercial ®shing vessels o the Ebro Delta (NW Mediterranean) was assessed in 1997 and 1998. Observations were performed on board two kinds of ®shing vessels with dierent timetables: bottom trawlers (diurnal activity) and purse seiners (nocturnal activity). Three situations were distinguished with respect to the season and the ®shing regime: (1) breeding season, both¯eets operating; (2) breeding season, only purse seiners operating due to a trawling moratorium;
Competition for food is widely cited as an important cost of coloniality among birds and much of ... more Competition for food is widely cited as an important cost of coloniality among birds and much of the evidence in support of this hypothesis comes from studies of colonial piscivorous seabirds. However, for generalist seabirds able to switch between different prey types, the role of food availability in relation to colony size is unclear. Here we investigate patterns of the consumption of seabird prey in relation to colony size in a generalist seabird, the great skua Stercorarius skua , in Shetland, UK. At the population level skuas feed mainly on sandeels Ammodytes marinus and fishery discards, but respond to declines in fish availability to facultatively prey on other seabirds. By comparing the consumption of seabirds among seven different sized colonies, including one colony with artificially reduced numbers of skuas (Fair Isle), we investigate whether consumption of seabird prey is influenced by skua population size, while simultaneously measuring seabird prey availability. Data from five years also enables us to investigate the influence of annual variation in environmental conditions on seabird consumption. Using measures of body condition and reproductive performance we investigate the consequences of living in different sized colonies, which may provide insight into ultimate costs of nesting at high population density. Skua diets varied among colonies and the proportion of seabird prey in the diet was inversely related to skua colony size, despite similar per capita numbers of seabirds across colonies. At the colony where their numbers were artificially suppressed, skuas consumed a greater proportion of seabirds per capita. Highly significant year effects in seabird predation were observed but the pattern among colonies remained consistent over time. Two measures of adult body condition (pectoral muscle index and mean corpuscular volume) revealed that adult great skuas were in poorer condition at the largest colony (Foula), but reproductive performance did not alter significantly among colonies. This study provides evidence that intra-specific competition among skuas may limit opportunities for obtaining seabird prey, which may be particularly important during periods of poor availability of sandeels and fishery discards, and has implications for assessing the impact of skuas on seabird populations.
Aim Apical pelagic species forage in predictable habitats, and their movements should signal biol... more Aim Apical pelagic species forage in predictable habitats, and their movements should signal biologically and ecologically significant areas of the marine ecosystem. Several countries are now engaged in identifying these areas based on animal tracking, but this is often limited to a few individuals from one breeding population, which may result in biased portrayals of the key marine habitats. To help identify such foraging areas, we compiled tracking data of a marine top predator from the main breeding colonies in the Central Macaronesia.
Capsule The breeding foraging and post-breeding dispersal movements of five satellite-tagged Bulw... more Capsule The breeding foraging and post-breeding dispersal movements of five satellite-tagged Bulwer's Petrels from the Canary Islands were recorded. Foraging trips lasted 5.6 days in average (n = 3), while the mean distance covered was 1261 km, and foraging areas were located over the continental slope and the adjacent pelagic waters, around 1200-2000 m depth and up to 350 km from the colony. After the chickrearing period, birds dispersed southwestwards to the tropical waters of the central Atlantic.
... 1985). 10s dias elegides para realizar 10s censos se corresponden con el ... De todas mane-ra... more ... 1985). 10s dias elegides para realizar 10s censos se corresponden con el ... De todas mane-ras, y considerando el nivel a que se quieren comparar 10s datos, 10s resultados de 10s censos pueden ... In Ros, J., Olivella, I. & Gilli, JM (eds.): Els sistemes naturals de les illes Medes. ...
RESUM.-Biologia de la conservació d'un ocell críticament amenaçat: la baldritja Puff... more RESUM.-Biologia de la conservació d'un ocell críticament amenaçat: la baldritja Puffinus mauretanicus. Una de les aus marines més amenaçades de la Mediterrània és la baldritja Puffinus mauretanicus. El present article resumeix l'estudi de la seva problemàtica de ...
El objetivo de este trabajo ha sido elaborar un diagnóstico de conservación para una especie en p... more El objetivo de este trabajo ha sido elaborar un diagnóstico de conservación para una especie en peligro de extinción, la pardela Balear (Puffinus mauretanicus) en el marco del Parque Nacional de Cabrera. Para completar conocimientos se ha dispuesto de datos históricos y de muestras de otras colonias con las que indirectamente se pueden valorar problemas comunes de conservación de la especie, pues las colonias del Parque son pequeñas y más sensibles pues a los efectos de la investigación. Hemos indagado sobre los siguientes aspectos: a) ecología de poblaciones, b) ecología trófica, c) hábitat oceanográfico y d) concentración de contaminantes (mercurio).
Uploads
Papers by José Arcos