When the going gets tough, the tough get going: effect of extreme climate on an Antarctic seabird's life history

International audience Individuals differ in many ways. Most produce few offspring; a handful produce many. Some die early; others live to old age. It is tempting to attribute these differences in outcomes to differences in individual traits, and thus in the demographic rates experienced. However, t...

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Bibliographic Details
Main Authors: Jenouvrier, Stéphanie, Aubry, Lise, Daalen, Silke Van, Barbraud, Christophe, Weimerskirch, Henri, Caswell, Hal
Other Authors: Woods Hole Oceanographic Institution (WHOI), 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), Colorado State University Fort Collins (CSU), Institute for Biodiversity and Ecosystem Dynamics - IBED (NETHERLANDS), Institute for Biodiversity and Ecosystem Dynamics (IBED)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2022
Subjects:
unobserved individual heterogeneity
individual quality
frailty
fixed heterogeneity
dynamic individual heterogeneity
stochasticity
[SDE]Environmental Sciences
Antarctic
Antarc*
Online Access:https://hal.archives-ouvertes.fr/hal-02317720
https://doi.org/10.1101/791855
Description
Summary:International audience Individuals differ in many ways. Most produce few offspring; a handful produce many. Some die early; others live to old age. It is tempting to attribute these differences in outcomes to differences in individual traits, and thus in the demographic rates experienced. However, there is more to individual variation than meets the eye of the biologist. Even among individuals sharing identical traits, life history outcomes (life expectancy and lifetime reproduction) will vary due to individual stochasticity, that is to chance. Quantifying the contributions of heterogeneity and chance is essential to understand natural variability. Interindividual differences vary across environmental conditions, hence heterogeneity and stochasticity depend on environmental conditions. We show that favourable conditions increase the contributions of individual stochasticity, and reduce the contributions of heterogeneity, to variance in demographic outcomes in a seabird population. The opposite is true under poor conditions. This result has important consequence for understanding the ecology and evolution of life history strategies.

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