Sexual segregation in the foraging behaviour of a slightly dimorphic seabird: Influence of the environment and fishery activity
1. Sexual segregation in foraging strategies has been little studied in marine species with slight sexual size dimorphism (SSD), particularly regarding the role of environmental conditions and fishery activities. Sexual differences in fishery attendance are of particular concern because uneven morta...
Published in: | Journal of Animal Ecology |
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Language: | English |
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Online Access: | http://hdl.handle.net/10508/15037 https://doi.org/10.1111/1365-2656.13437 |
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ftieo:oai:repositorio.ieo.es:10508/15037 2023-06-11T04:14:37+02:00 Sexual segregation in the foraging behaviour of a slightly dimorphic seabird: Influence of the environment and fishery activity Reyes-González, J.M. (José Manuel) De Felipe, Fernanda Morera-Pujol, Virginia Soriano-Redondo, Andrea Navarro-Herrero, Leia Zango, Laura García-Barcelona, S. (Salvador) Ramos, R. (Raúl) González-Solís, J. (Jacob) 2021 http://hdl.handle.net/10508/15037 https://doi.org/10.1111/1365-2656.13437 eng eng Wiley Centro Oceanográfico de Málaga 1365-2656 http://hdl.handle.net/10508/15037 doi:10.1111/1365-2656.13437 closed access diet feeding ecology North Atlantic Oscillation North Western Mediterranean seabird–fishery interactions trophic ecology vessel monitoring system research article 2021 ftieo https://doi.org/10.1111/1365-2656.13437 2023-05-02T23:49:30Z 1. Sexual segregation in foraging strategies has been little studied in marine species with slight sexual size dimorphism (SSD), particularly regarding the role of environmental conditions and fishery activities. Sexual differences in fishery attendance are of particular concern because uneven mortality associated with bycatch may exacerbate impacts in wildlife populations. 2. Using a seabird species with slight SSD, the Scopoli's shearwater Calonectris diomedea, we assessed sexual differences in foraging strategies and evaluated whether annual environmental conditions and fishery activity shaped such differences. 3. We used a 4-year dataset combining bird GPS tracking, stable isotope analysis, the North Atlantic Oscillation index (NAO, as main proxy of the annual environmental conditions), and fishing vessel positioning data (Vessel Monitoring System, VMS) from the North Western Mediterranean, a region under intense fishery pressure. 4. From 2012 to 2015, we tracked 635 foraging trips from 78 individuals. Females showed a greater foraging effort, a lower fishery attendance, a lower trophic level, and a narrower isotopic niche width than males. Moreover, in years with unfavourable environmental conditions, both sexes showed a lower fishery attendance and increased foraging effort compared to the year with most favourable conditions. 5. Our results revealed that environmental conditions influence space use, feeding resources and fishery attendance differently in males and females, overall suggesting competitive exclusion of females by males from main foraging areas and feeding resources, particularly in unfavourable environmental conditions. We highlight the importance of evaluating sexual segregation under disparate environmental conditions, particularly in species with slight SSD, since segregation may pass otherwise unnoticed if only years with similar environmental conditions are considered. The higher fishery attendance of males likely explains the malebiased bycatch ratio for this species. Thus, ... Article in Journal/Newspaper North Atlantic North Atlantic oscillation Instituto Español de Oceanografía: e-IEO Journal of Animal Ecology 90 5 1109 1121 |
institution |
Open Polar |
collection |
Instituto Español de Oceanografía: e-IEO |
op_collection_id |
ftieo |
language |
English |
topic |
diet feeding ecology North Atlantic Oscillation North Western Mediterranean seabird–fishery interactions trophic ecology vessel monitoring system |
spellingShingle |
diet feeding ecology North Atlantic Oscillation North Western Mediterranean seabird–fishery interactions trophic ecology vessel monitoring system Reyes-González, J.M. (José Manuel) De Felipe, Fernanda Morera-Pujol, Virginia Soriano-Redondo, Andrea Navarro-Herrero, Leia Zango, Laura García-Barcelona, S. (Salvador) Ramos, R. (Raúl) González-Solís, J. (Jacob) Sexual segregation in the foraging behaviour of a slightly dimorphic seabird: Influence of the environment and fishery activity |
topic_facet |
diet feeding ecology North Atlantic Oscillation North Western Mediterranean seabird–fishery interactions trophic ecology vessel monitoring system |
description |
1. Sexual segregation in foraging strategies has been little studied in marine species with slight sexual size dimorphism (SSD), particularly regarding the role of environmental conditions and fishery activities. Sexual differences in fishery attendance are of particular concern because uneven mortality associated with bycatch may exacerbate impacts in wildlife populations. 2. Using a seabird species with slight SSD, the Scopoli's shearwater Calonectris diomedea, we assessed sexual differences in foraging strategies and evaluated whether annual environmental conditions and fishery activity shaped such differences. 3. We used a 4-year dataset combining bird GPS tracking, stable isotope analysis, the North Atlantic Oscillation index (NAO, as main proxy of the annual environmental conditions), and fishing vessel positioning data (Vessel Monitoring System, VMS) from the North Western Mediterranean, a region under intense fishery pressure. 4. From 2012 to 2015, we tracked 635 foraging trips from 78 individuals. Females showed a greater foraging effort, a lower fishery attendance, a lower trophic level, and a narrower isotopic niche width than males. Moreover, in years with unfavourable environmental conditions, both sexes showed a lower fishery attendance and increased foraging effort compared to the year with most favourable conditions. 5. Our results revealed that environmental conditions influence space use, feeding resources and fishery attendance differently in males and females, overall suggesting competitive exclusion of females by males from main foraging areas and feeding resources, particularly in unfavourable environmental conditions. We highlight the importance of evaluating sexual segregation under disparate environmental conditions, particularly in species with slight SSD, since segregation may pass otherwise unnoticed if only years with similar environmental conditions are considered. The higher fishery attendance of males likely explains the malebiased bycatch ratio for this species. Thus, ... |
format |
Article in Journal/Newspaper |
author |
Reyes-González, J.M. (José Manuel) De Felipe, Fernanda Morera-Pujol, Virginia Soriano-Redondo, Andrea Navarro-Herrero, Leia Zango, Laura García-Barcelona, S. (Salvador) Ramos, R. (Raúl) González-Solís, J. (Jacob) |
author_facet |
Reyes-González, J.M. (José Manuel) De Felipe, Fernanda Morera-Pujol, Virginia Soriano-Redondo, Andrea Navarro-Herrero, Leia Zango, Laura García-Barcelona, S. (Salvador) Ramos, R. (Raúl) González-Solís, J. (Jacob) |
author_sort |
Reyes-González, J.M. (José Manuel) |
title |
Sexual segregation in the foraging behaviour of a slightly dimorphic seabird: Influence of the environment and fishery activity |
title_short |
Sexual segregation in the foraging behaviour of a slightly dimorphic seabird: Influence of the environment and fishery activity |
title_full |
Sexual segregation in the foraging behaviour of a slightly dimorphic seabird: Influence of the environment and fishery activity |
title_fullStr |
Sexual segregation in the foraging behaviour of a slightly dimorphic seabird: Influence of the environment and fishery activity |
title_full_unstemmed |
Sexual segregation in the foraging behaviour of a slightly dimorphic seabird: Influence of the environment and fishery activity |
title_sort |
sexual segregation in the foraging behaviour of a slightly dimorphic seabird: influence of the environment and fishery activity |
publisher |
Wiley |
publishDate |
2021 |
url |
http://hdl.handle.net/10508/15037 https://doi.org/10.1111/1365-2656.13437 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
1365-2656 http://hdl.handle.net/10508/15037 doi:10.1111/1365-2656.13437 |
op_rights |
closed access |
op_doi |
https://doi.org/10.1111/1365-2656.13437 |
container_title |
Journal of Animal Ecology |
container_volume |
90 |
container_issue |
5 |
container_start_page |
1109 |
op_container_end_page |
1121 |
_version_ |
1768392752731521024 |