Demographic and population responses of an apex predator to climate and its prey: a long‐term study of south polar skuas
International audience Ecologists widely acknowledge that a complex interplay of endogenous (density‐dependent) and exogenous (density‐independent) factors impact demographic processes. Individuals respond differently to those forces, ultimately shaping the dynamics of wild populations. Most compreh...
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ftunivnantes:oai:HAL:hal-02195548v1 2023-05-15T13:04:55+02:00 Demographic and population responses of an apex predator to climate and its prey: a long‐term study of south polar skuas Pacoureau, Nathan Delord, Karine Jenouvrier, Stéphanie Barbraud, Christophe Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) 2019-07-22 https://hal.archives-ouvertes.fr/hal-02195548 https://doi.org/10.1002/ecm.1388 en eng HAL CCSD Ecological Society of America info:eu-repo/semantics/altIdentifier/doi/10.1002/ecm.1388 hal-02195548 https://hal.archives-ouvertes.fr/hal-02195548 doi:10.1002/ecm.1388 ISSN: 0012-9615 Ecological monographs https://hal.archives-ouvertes.fr/hal-02195548 Ecological monographs, 2019, 89 (4), pp.e01388. ⟨10.1002/ecm.1388⟩ Adelie Penguin Pygoscelis adeliae age structure Antarctica capture–mark–recapture Catharacta maccormicki density dependence deterministic density-dependent matrix population model Emperor Penguin Aptenodytes forsteri food availability multistate model sea ice concentration [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2019 ftunivnantes https://doi.org/10.1002/ecm.1388 2023-01-04T00:02:10Z International audience Ecologists widely acknowledge that a complex interplay of endogenous (density‐dependent) and exogenous (density‐independent) factors impact demographic processes. Individuals respond differently to those forces, ultimately shaping the dynamics of wild populations. Most comprehensive studies disentangling simultaneously the effects of density dependence, climate, and prey abundance while taking into account age structure were conducted in terrestrial ecosystems. However, studies on marine populations are lacking. Here we provide insight into the mechanisms affecting four vital rates of an apex Antarctic marine predator population, the South Polar Skua Catharacta maccormicki, by combining a nearly half‐century longitudinal time series of individual life histories and abundance data, with climatic and prey abundance covariates. Using multistate capture–mark–recapture models, we estimated age classes effects on survival, breeding, successful breeding with one or two chicks and successful breeding with two chicks probabilities, and assessed the different effects of population size, climate, and prey abundance on each age‐specific demographic parameter. We found evidence for strong age effects in the four vital rates studied. Vital rates at younger ages were lower than those of older age classes for all parameters. Results clearly evidenced direct and indirect influences of local climate (summer sea ice concentration), of available prey resources (penguins), and of intrinsic factors (size of the breeding population). More covariate effects were found on reproductive rates than on survival, and younger age classes were more sensitive than the older ones. Results from a deterministic age‐structured density‐dependent matrix population model indicated greater effects of prey abundance and sea ice concentration on the total population size than on the breeding population size. Both total population size and the number of breeders were strongly affected by low values of sea ice concentration. ... Article in Journal/Newspaper Adelie penguin Antarc* Antarctic Antarctica Aptenodytes forsteri Catharacta maccormicki Pygoscelis adeliae Sea ice South Polar Skuas Université de Nantes: HAL-UNIV-NANTES Antarctic Ecological Monographs 89 4 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Adelie Penguin Pygoscelis adeliae age structure Antarctica capture–mark–recapture Catharacta maccormicki density dependence deterministic density-dependent matrix population model Emperor Penguin Aptenodytes forsteri food availability multistate model sea ice concentration [SDE]Environmental Sciences |
spellingShingle |
Adelie Penguin Pygoscelis adeliae age structure Antarctica capture–mark–recapture Catharacta maccormicki density dependence deterministic density-dependent matrix population model Emperor Penguin Aptenodytes forsteri food availability multistate model sea ice concentration [SDE]Environmental Sciences Pacoureau, Nathan Delord, Karine Jenouvrier, Stéphanie Barbraud, Christophe Demographic and population responses of an apex predator to climate and its prey: a long‐term study of south polar skuas |
topic_facet |
Adelie Penguin Pygoscelis adeliae age structure Antarctica capture–mark–recapture Catharacta maccormicki density dependence deterministic density-dependent matrix population model Emperor Penguin Aptenodytes forsteri food availability multistate model sea ice concentration [SDE]Environmental Sciences |
description |
International audience Ecologists widely acknowledge that a complex interplay of endogenous (density‐dependent) and exogenous (density‐independent) factors impact demographic processes. Individuals respond differently to those forces, ultimately shaping the dynamics of wild populations. Most comprehensive studies disentangling simultaneously the effects of density dependence, climate, and prey abundance while taking into account age structure were conducted in terrestrial ecosystems. However, studies on marine populations are lacking. Here we provide insight into the mechanisms affecting four vital rates of an apex Antarctic marine predator population, the South Polar Skua Catharacta maccormicki, by combining a nearly half‐century longitudinal time series of individual life histories and abundance data, with climatic and prey abundance covariates. Using multistate capture–mark–recapture models, we estimated age classes effects on survival, breeding, successful breeding with one or two chicks and successful breeding with two chicks probabilities, and assessed the different effects of population size, climate, and prey abundance on each age‐specific demographic parameter. We found evidence for strong age effects in the four vital rates studied. Vital rates at younger ages were lower than those of older age classes for all parameters. Results clearly evidenced direct and indirect influences of local climate (summer sea ice concentration), of available prey resources (penguins), and of intrinsic factors (size of the breeding population). More covariate effects were found on reproductive rates than on survival, and younger age classes were more sensitive than the older ones. Results from a deterministic age‐structured density‐dependent matrix population model indicated greater effects of prey abundance and sea ice concentration on the total population size than on the breeding population size. Both total population size and the number of breeders were strongly affected by low values of sea ice concentration. ... |
author2 |
Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) |
format |
Article in Journal/Newspaper |
author |
Pacoureau, Nathan Delord, Karine Jenouvrier, Stéphanie Barbraud, Christophe |
author_facet |
Pacoureau, Nathan Delord, Karine Jenouvrier, Stéphanie Barbraud, Christophe |
author_sort |
Pacoureau, Nathan |
title |
Demographic and population responses of an apex predator to climate and its prey: a long‐term study of south polar skuas |
title_short |
Demographic and population responses of an apex predator to climate and its prey: a long‐term study of south polar skuas |
title_full |
Demographic and population responses of an apex predator to climate and its prey: a long‐term study of south polar skuas |
title_fullStr |
Demographic and population responses of an apex predator to climate and its prey: a long‐term study of south polar skuas |
title_full_unstemmed |
Demographic and population responses of an apex predator to climate and its prey: a long‐term study of south polar skuas |
title_sort |
demographic and population responses of an apex predator to climate and its prey: a long‐term study of south polar skuas |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.archives-ouvertes.fr/hal-02195548 https://doi.org/10.1002/ecm.1388 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Adelie penguin Antarc* Antarctic Antarctica Aptenodytes forsteri Catharacta maccormicki Pygoscelis adeliae Sea ice South Polar Skuas |
genre_facet |
Adelie penguin Antarc* Antarctic Antarctica Aptenodytes forsteri Catharacta maccormicki Pygoscelis adeliae Sea ice South Polar Skuas |
op_source |
ISSN: 0012-9615 Ecological monographs https://hal.archives-ouvertes.fr/hal-02195548 Ecological monographs, 2019, 89 (4), pp.e01388. ⟨10.1002/ecm.1388⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/ecm.1388 hal-02195548 https://hal.archives-ouvertes.fr/hal-02195548 doi:10.1002/ecm.1388 |
op_doi |
https://doi.org/10.1002/ecm.1388 |
container_title |
Ecological Monographs |
container_volume |
89 |
container_issue |
4 |
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1766375066341212160 |