Population response of an apex Antarctic consumer to its prey and climate fluctuations
International audience A fundamental endeavor in population ecology is to identify the drivers of population dynamics. A few empirical studies included the effect of prey abundance when investigating simultaneously the effects of density-dependence and climate factors on marine top-predator populati...
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ftunivrochelle:oai:HAL:hal-02201380v1 2024-04-28T08:01:45+00:00 Population response of an apex Antarctic consumer to its prey and climate fluctuations Pacoureau, Nathan Authier, Matthieu Delord, Karine Barbraud, Christophe Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Institut National de la Recherche Agronomique (INRA)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Observatoire pour la Conservation de la Mégafaune Marine (PELAGIS) LIttoral ENvironnement et Sociétés (LIENSs) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2019-02 https://hal.science/hal-02201380 https://doi.org/10.1007/s00442-018-4249-5 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00442-018-4249-5 hal-02201380 https://hal.science/hal-02201380 doi:10.1007/s00442-018-4249-5 ISSN: 0029-8549 EISSN: 1432-1939 Oecologia https://hal.science/hal-02201380 Oecologia, 2019, 189 (2), pp.279-291. ⟨10.1007/s00442-018-4249-5⟩ Adélie penguin Bayesian modeling Density-dependence Emperor penguin South polar skua [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2019 ftunivrochelle https://doi.org/10.1007/s00442-018-4249-5 2024-04-03T15:15:57Z International audience A fundamental endeavor in population ecology is to identify the drivers of population dynamics. A few empirical studies included the effect of prey abundance when investigating simultaneously the effects of density-dependence and climate factors on marine top-predator population dynamics. Our aim was to unravel the mechanisms forcing population dynamics of an apex consumer seabird, the south polar skua, using long-term climatic and population time series of the consumer and its prey in Terre Adélie, Antarctica. Influences of density-dependence, climatic factors, and prey abundance with lag effects were tested on the breeding population dynamics with a Bayesian multi-model inference approach. We evidenced a negative trend in breeding population growth rate when density increased. Lagged effects of sea-ice concentration and air temperature in spring and a contemporary effect of prey resources were supported. Remarkably, results outline a reverse response of the south polar skua and one of its main preys to the same environmental factor (sea-ice concentration), suggesting a strong link between skua and penguin dynamics. The causal mechanisms may involve competition for food and space through territorial behavior as well as local climate and prey availability, which probably operate on breeding parameters (breeding propensity, breeding success, or recruitment) rather than on adult survival. Our results provide new insights on the relative importance of factors forcing the population dynamics of an apex consumer including density-dependence, local climate conditions, and direct and indirect effects of prey abundance. Article in Journal/Newspaper Antarc* Antarctic Antarctica Sea ice HAL - Université de La Rochelle Oecologia 189 2 279 291 |
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Open Polar |
collection |
HAL - Université de La Rochelle |
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ftunivrochelle |
language |
English |
topic |
Adélie penguin Bayesian modeling Density-dependence Emperor penguin South polar skua [SDE]Environmental Sciences |
spellingShingle |
Adélie penguin Bayesian modeling Density-dependence Emperor penguin South polar skua [SDE]Environmental Sciences Pacoureau, Nathan Authier, Matthieu Delord, Karine Barbraud, Christophe Population response of an apex Antarctic consumer to its prey and climate fluctuations |
topic_facet |
Adélie penguin Bayesian modeling Density-dependence Emperor penguin South polar skua [SDE]Environmental Sciences |
description |
International audience A fundamental endeavor in population ecology is to identify the drivers of population dynamics. A few empirical studies included the effect of prey abundance when investigating simultaneously the effects of density-dependence and climate factors on marine top-predator population dynamics. Our aim was to unravel the mechanisms forcing population dynamics of an apex consumer seabird, the south polar skua, using long-term climatic and population time series of the consumer and its prey in Terre Adélie, Antarctica. Influences of density-dependence, climatic factors, and prey abundance with lag effects were tested on the breeding population dynamics with a Bayesian multi-model inference approach. We evidenced a negative trend in breeding population growth rate when density increased. Lagged effects of sea-ice concentration and air temperature in spring and a contemporary effect of prey resources were supported. Remarkably, results outline a reverse response of the south polar skua and one of its main preys to the same environmental factor (sea-ice concentration), suggesting a strong link between skua and penguin dynamics. The causal mechanisms may involve competition for food and space through territorial behavior as well as local climate and prey availability, which probably operate on breeding parameters (breeding propensity, breeding success, or recruitment) rather than on adult survival. Our results provide new insights on the relative importance of factors forcing the population dynamics of an apex consumer including density-dependence, local climate conditions, and direct and indirect effects of prey abundance. |
author2 |
Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Institut National de la Recherche Agronomique (INRA)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Observatoire pour la Conservation de la Mégafaune Marine (PELAGIS) LIttoral ENvironnement et Sociétés (LIENSs) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Pacoureau, Nathan Authier, Matthieu Delord, Karine Barbraud, Christophe |
author_facet |
Pacoureau, Nathan Authier, Matthieu Delord, Karine Barbraud, Christophe |
author_sort |
Pacoureau, Nathan |
title |
Population response of an apex Antarctic consumer to its prey and climate fluctuations |
title_short |
Population response of an apex Antarctic consumer to its prey and climate fluctuations |
title_full |
Population response of an apex Antarctic consumer to its prey and climate fluctuations |
title_fullStr |
Population response of an apex Antarctic consumer to its prey and climate fluctuations |
title_full_unstemmed |
Population response of an apex Antarctic consumer to its prey and climate fluctuations |
title_sort |
population response of an apex antarctic consumer to its prey and climate fluctuations |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02201380 https://doi.org/10.1007/s00442-018-4249-5 |
genre |
Antarc* Antarctic Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Sea ice |
op_source |
ISSN: 0029-8549 EISSN: 1432-1939 Oecologia https://hal.science/hal-02201380 Oecologia, 2019, 189 (2), pp.279-291. ⟨10.1007/s00442-018-4249-5⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00442-018-4249-5 hal-02201380 https://hal.science/hal-02201380 doi:10.1007/s00442-018-4249-5 |
op_doi |
https://doi.org/10.1007/s00442-018-4249-5 |
container_title |
Oecologia |
container_volume |
189 |
container_issue |
2 |
container_start_page |
279 |
op_container_end_page |
291 |
_version_ |
1797573360312385536 |