Adjustment of pre‐moult foraging strategies in Macaroni Penguins Eudyptes chrysolophus according to locality, sex and breeding status
The annual moult creates the highest physiological stress during a penguin's breeding‐cycle and is preceded by a period of hyperphagia at sea. Although crucial to individual survival, foraging strategies before moult have been little investigated in keystone marine consumers in the Southern Oce...
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crwiley:10.1111/ibi.12151 2024-06-02T08:06:14+00:00 Adjustment of pre‐moult foraging strategies in Macaroni Penguins Eudyptes chrysolophus according to locality, sex and breeding status Thiebot, Jean‐Baptiste Cherel, Yves Acqueberge, Manon Prudor, Aurélien Trathan, Philip N. Bost, Charles‐André Battley, Phil Agence Nationale de la Recherche French Polar Institute Paul-Emile Victor 2014 http://dx.doi.org/10.1111/ibi.12151 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fibi.12151 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ibi.12151 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ibis volume 156, issue 3, page 511-522 ISSN 0019-1019 1474-919X journal-article 2014 crwiley https://doi.org/10.1111/ibi.12151 2024-05-03T11:35:35Z The annual moult creates the highest physiological stress during a penguin's breeding‐cycle and is preceded by a period of hyperphagia at sea. Although crucial to individual survival, foraging strategies before moult have been little investigated in keystone marine consumers in the Southern Ocean. The Macaroni Penguin Eudyptes chrysolophus demonstrates how individuals may adjust their foraging strategies during this period in line with constraints such as potential intraspecific competition between localities, foraging ability between dimorphic sexes and timing at sea between breeding and non‐breeding population components. We recorded pre‐moult behaviour at sea for 22 Macaroni Penguins from Crozet and Kerguelen Islands (southern Indian Ocean) during 2009 and 2011, using light‐based geolocation and stable isotope analysis. Penguins were distributed in population‐specific oceanic areas with similar surface temperatures (3.5 °C) south of the archipelagos, where they foraged at comparable trophic levels based on stable isotopes of their blood. Bayesian ‘broken stick’ modelling with concurrent analysis of seawater temperature records from the animal‐borne devices showed that within each population, females remained 6 days longer than males in the colder waters before heading back towards their colonies. Finally, 17 other non‐breeding individuals that moulted earlier had a higher mean blood δ 15 N value than did post‐breeding birds, meaning that early moulters probably fed more on fish than did late moulters. Our findings of such adjustments in foraging strategies developed across locality, sex and breeding status help understanding of the species' contrasted pre‐moult biology across its range and its ecology in the non‐breeding period. Article in Journal/Newspaper Eudyptes chrysolophus Kerguelen Islands Macaroni penguin Southern Ocean Wiley Online Library Indian Kerguelen Kerguelen Islands Southern Ocean Ibis 156 3 511 522 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
The annual moult creates the highest physiological stress during a penguin's breeding‐cycle and is preceded by a period of hyperphagia at sea. Although crucial to individual survival, foraging strategies before moult have been little investigated in keystone marine consumers in the Southern Ocean. The Macaroni Penguin Eudyptes chrysolophus demonstrates how individuals may adjust their foraging strategies during this period in line with constraints such as potential intraspecific competition between localities, foraging ability between dimorphic sexes and timing at sea between breeding and non‐breeding population components. We recorded pre‐moult behaviour at sea for 22 Macaroni Penguins from Crozet and Kerguelen Islands (southern Indian Ocean) during 2009 and 2011, using light‐based geolocation and stable isotope analysis. Penguins were distributed in population‐specific oceanic areas with similar surface temperatures (3.5 °C) south of the archipelagos, where they foraged at comparable trophic levels based on stable isotopes of their blood. Bayesian ‘broken stick’ modelling with concurrent analysis of seawater temperature records from the animal‐borne devices showed that within each population, females remained 6 days longer than males in the colder waters before heading back towards their colonies. Finally, 17 other non‐breeding individuals that moulted earlier had a higher mean blood δ 15 N value than did post‐breeding birds, meaning that early moulters probably fed more on fish than did late moulters. Our findings of such adjustments in foraging strategies developed across locality, sex and breeding status help understanding of the species' contrasted pre‐moult biology across its range and its ecology in the non‐breeding period. |
author2 |
Battley, Phil Agence Nationale de la Recherche French Polar Institute Paul-Emile Victor |
format |
Article in Journal/Newspaper |
author |
Thiebot, Jean‐Baptiste Cherel, Yves Acqueberge, Manon Prudor, Aurélien Trathan, Philip N. Bost, Charles‐André |
spellingShingle |
Thiebot, Jean‐Baptiste Cherel, Yves Acqueberge, Manon Prudor, Aurélien Trathan, Philip N. Bost, Charles‐André Adjustment of pre‐moult foraging strategies in Macaroni Penguins Eudyptes chrysolophus according to locality, sex and breeding status |
author_facet |
Thiebot, Jean‐Baptiste Cherel, Yves Acqueberge, Manon Prudor, Aurélien Trathan, Philip N. Bost, Charles‐André |
author_sort |
Thiebot, Jean‐Baptiste |
title |
Adjustment of pre‐moult foraging strategies in Macaroni Penguins Eudyptes chrysolophus according to locality, sex and breeding status |
title_short |
Adjustment of pre‐moult foraging strategies in Macaroni Penguins Eudyptes chrysolophus according to locality, sex and breeding status |
title_full |
Adjustment of pre‐moult foraging strategies in Macaroni Penguins Eudyptes chrysolophus according to locality, sex and breeding status |
title_fullStr |
Adjustment of pre‐moult foraging strategies in Macaroni Penguins Eudyptes chrysolophus according to locality, sex and breeding status |
title_full_unstemmed |
Adjustment of pre‐moult foraging strategies in Macaroni Penguins Eudyptes chrysolophus according to locality, sex and breeding status |
title_sort |
adjustment of pre‐moult foraging strategies in macaroni penguins eudyptes chrysolophus according to locality, sex and breeding status |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.1111/ibi.12151 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fibi.12151 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ibi.12151 |
geographic |
Indian Kerguelen Kerguelen Islands Southern Ocean |
geographic_facet |
Indian Kerguelen Kerguelen Islands Southern Ocean |
genre |
Eudyptes chrysolophus Kerguelen Islands Macaroni penguin Southern Ocean |
genre_facet |
Eudyptes chrysolophus Kerguelen Islands Macaroni penguin Southern Ocean |
op_source |
Ibis volume 156, issue 3, page 511-522 ISSN 0019-1019 1474-919X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/ibi.12151 |
container_title |
Ibis |
container_volume |
156 |
container_issue |
3 |
container_start_page |
511 |
op_container_end_page |
522 |
_version_ |
1800751159402561536 |