Energy expenditure of Adélie penguins during the breeding season: females pay the cost in years of low food availability

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    Embargo yn dod i ben: 18/03/26

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  • A.L. Machado-Gaye
    Centro Universitario Regional del Este, Universidad de La República, Maldonado, Uruguay
  • Marianna Chimienti
    Centre d'Etudes Biologiques de Chizé (CEBC)
  • A. Kato
    Centre d'Etudes Biologiques de Chizé (CEBC)
  • Y. Ropert-Coudert
    Centre d'Etudes Biologiques de Chizé (CEBC)
  • A. Barbosa
    Departamento de Ecología Evolutiva, Museo Nacional de Ciencias Naturales (CSIC), Madrid, Spain
  • P. Bustamante
    Littoral, Environnement et Sociétés, UMR 7266 CNRS-La Rochelle Université, France
  • M. Cosse
    Departamento de Biodiversidad y Genética, Instituto de Investigaciones Biológicas Clemente Estable (IIBCE), Ministerio de Educación y Cultura (MEC), Montevideo, Uruguay
  • J. Menéndez-Blázquez
    Instituto Cavanilles de Biodiversidad y Biología Evolutiva (ICBiBe), Universitat de València, Spain
  • N. Zaldúa
    Centro Universitario Regional del Este, Universidad de La República, Maldonado, Uruguay
  • A. Soutullo
    Centro Universitario Regional del Este, Universidad de La República, Maldonado, Uruguay
Changes in prey availability can lead to mismatches between consumers and resources, decreasing the fitness of consumers, especially during periods of high energy demand such as reproduction. We investigated interseasonal variation in the foraging behaviour of chick-rearing Adélie penguins, Pygoscelis adeliae, in a declining colony in the West Antarctic Peninsula to assess the impact of changes in prey abundance. Specifically, we analysed how these changes affect the energetic cost of males and females during the breeding season. Using information from foraging trips, diet, body condition and daily energy expenditure of 38 Adélie penguins breeding in Ardley Island, King George Island, in 2019/2020 and 2021/2022, we found that during low food availability conditions, penguins were forced to increase their foraging effort and their body mass was lower. Specifically, females extended their foraging trips, resulting in 40% higher energy expenditure compared to a year with high prey availability. We observed no significant changes in physiological condition, breeding success or trophic niche. The lower fat reserves and higher energy expenditure of females during the breeding season with low food availability may render them more vulnerable to the challenging conditions of the winter season, with potential negative consequences on population trends.
Iaith wreiddiolSaesneg
Rhif yr erthygl123144
CyfnodolynAnimal Behaviour
Cyfrol222
Dyddiad ar-lein cynnar18 Maw 2025
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 3 Ebr 2025
Gweld graff cysylltiadau