Spatial segregation in a sexually dimorphic central place forager: Competitive exclusion or niche divergence?
Abstract Sexual competition is increasingly recognized as an important selective pressure driving species distributions. However, few studies have investigated the relative importance of interpopulation versus intrapopulation competition in relation to habitat availability and selection. To explain...
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Online Access: | http://dx.doi.org/10.1111/1365-2656.13552 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2656.13552 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1365-2656.13552 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2656.13552 |
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crwiley:10.1111/1365-2656.13552 2024-09-15T18:03:43+00:00 Spatial segregation in a sexually dimorphic central place forager: Competitive exclusion or niche divergence? Orgeret, Florian Reisinger, Ryan R. Carpenter‐Kling, Tegan Keys, Danielle Z. Corbeau, Alexandre Bost, Charles‐André Weimerskirch, Henri Pistorius, Pierre A. H2020 Environment FP7 Ideas: European Research Council National Research Foundation 2021 http://dx.doi.org/10.1111/1365-2656.13552 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2656.13552 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1365-2656.13552 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2656.13552 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Animal Ecology volume 90, issue 10, page 2404-2420 ISSN 0021-8790 1365-2656 journal-article 2021 crwiley https://doi.org/10.1111/1365-2656.13552 2024-07-18T04:24:16Z Abstract Sexual competition is increasingly recognized as an important selective pressure driving species distributions. However, few studies have investigated the relative importance of interpopulation versus intrapopulation competition in relation to habitat availability and selection. To explain spatial segregation between sexes that often occurs in non‐territorial and central place foragers, such as seabirds, two hypotheses are commonly used. The ‘competitive exclusion’ hypothesis states that dominant individuals should exclude subordinate individuals through direct competition, whereas the ‘niche divergence’ hypothesis states that segregation occurs due to past competition and habitat specialization. We tested these hypotheses in two populations of an extreme wide‐ranging and sexually dimorphic seabird, investigating the relative role of intrapopulation and interpopulation competition in influencing sex‐specific distribution and habitat preferences. Using GPS loggers, we tracked 192 wandering albatrosses Diomedea exulans during four consecutive years (2016–2019), from two neighbouring populations in the Southern Ocean (Prince Edward and Crozet archipelagos). We simulated pseudo‐tracks to create a null spatial distribution and used Kernel Density Estimates (KDE) and Resource Selection Functions (RSF) to distinguish the relative importance of within‐ versus between‐population competition. Kernel Density Estimates showed that only intrapopulation sexual segregation was significant for each monitoring year, and that tracks between the two colonies resulted in greater overlap than expected from the null distribution, especially for the females. RSF confirmed these results and highlighted key at‐sea foraging areas, even if the estimated of at‐sea densities were extremely low. These differences in selected areas between sites and sexes were, however, associated with high interannual variability in habitat preferences, with no clear specific preferences per site and sex. Our results suggest that even with low ... Article in Journal/Newspaper Diomedea exulans Southern Ocean Wiley Online Library Journal of Animal Ecology 90 10 2404 2420 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Sexual competition is increasingly recognized as an important selective pressure driving species distributions. However, few studies have investigated the relative importance of interpopulation versus intrapopulation competition in relation to habitat availability and selection. To explain spatial segregation between sexes that often occurs in non‐territorial and central place foragers, such as seabirds, two hypotheses are commonly used. The ‘competitive exclusion’ hypothesis states that dominant individuals should exclude subordinate individuals through direct competition, whereas the ‘niche divergence’ hypothesis states that segregation occurs due to past competition and habitat specialization. We tested these hypotheses in two populations of an extreme wide‐ranging and sexually dimorphic seabird, investigating the relative role of intrapopulation and interpopulation competition in influencing sex‐specific distribution and habitat preferences. Using GPS loggers, we tracked 192 wandering albatrosses Diomedea exulans during four consecutive years (2016–2019), from two neighbouring populations in the Southern Ocean (Prince Edward and Crozet archipelagos). We simulated pseudo‐tracks to create a null spatial distribution and used Kernel Density Estimates (KDE) and Resource Selection Functions (RSF) to distinguish the relative importance of within‐ versus between‐population competition. Kernel Density Estimates showed that only intrapopulation sexual segregation was significant for each monitoring year, and that tracks between the two colonies resulted in greater overlap than expected from the null distribution, especially for the females. RSF confirmed these results and highlighted key at‐sea foraging areas, even if the estimated of at‐sea densities were extremely low. These differences in selected areas between sites and sexes were, however, associated with high interannual variability in habitat preferences, with no clear specific preferences per site and sex. Our results suggest that even with low ... |
author2 |
H2020 Environment FP7 Ideas: European Research Council National Research Foundation |
format |
Article in Journal/Newspaper |
author |
Orgeret, Florian Reisinger, Ryan R. Carpenter‐Kling, Tegan Keys, Danielle Z. Corbeau, Alexandre Bost, Charles‐André Weimerskirch, Henri Pistorius, Pierre A. |
spellingShingle |
Orgeret, Florian Reisinger, Ryan R. Carpenter‐Kling, Tegan Keys, Danielle Z. Corbeau, Alexandre Bost, Charles‐André Weimerskirch, Henri Pistorius, Pierre A. Spatial segregation in a sexually dimorphic central place forager: Competitive exclusion or niche divergence? |
author_facet |
Orgeret, Florian Reisinger, Ryan R. Carpenter‐Kling, Tegan Keys, Danielle Z. Corbeau, Alexandre Bost, Charles‐André Weimerskirch, Henri Pistorius, Pierre A. |
author_sort |
Orgeret, Florian |
title |
Spatial segregation in a sexually dimorphic central place forager: Competitive exclusion or niche divergence? |
title_short |
Spatial segregation in a sexually dimorphic central place forager: Competitive exclusion or niche divergence? |
title_full |
Spatial segregation in a sexually dimorphic central place forager: Competitive exclusion or niche divergence? |
title_fullStr |
Spatial segregation in a sexually dimorphic central place forager: Competitive exclusion or niche divergence? |
title_full_unstemmed |
Spatial segregation in a sexually dimorphic central place forager: Competitive exclusion or niche divergence? |
title_sort |
spatial segregation in a sexually dimorphic central place forager: competitive exclusion or niche divergence? |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1111/1365-2656.13552 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2656.13552 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1365-2656.13552 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2656.13552 |
genre |
Diomedea exulans Southern Ocean |
genre_facet |
Diomedea exulans Southern Ocean |
op_source |
Journal of Animal Ecology volume 90, issue 10, page 2404-2420 ISSN 0021-8790 1365-2656 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/1365-2656.13552 |
container_title |
Journal of Animal Ecology |
container_volume |
90 |
container_issue |
10 |
container_start_page |
2404 |
op_container_end_page |
2420 |
_version_ |
1810441190362841088 |