Extreme climate events and individual heterogeneity shape life-history traits and population dynamics

• Published in: Ecological Monographs
• Main Authors: Jenouvrier, Stéphanie, Péron, Clara, Weimerskirch, Henri
• Other Authors: Biology Department (WHOI), Woods Hole Oceanographic Institution (WHOI), Institute for Marine and Antarctic Studies Horbat (IMAS), University of Tasmania Hobart, Australia (UTAS), Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC), Université de La Rochelle (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
• Language: English
• Published: HAL CCSD 2015
• Subjects: stochastic population growth; sensitivities; Southern Fulmar; body condition; foraging behaviors; Fulmarus glacialoides; individual quality; individual stochasticity; life-history trade-offs; sea ice; Terre Adelie; East Antarctica; [SDE]Environmental Sciences; Antarctic; Fulmar; Antarc*; Antarctica; Sea ice
• Online Access: https://hal.archives-ouvertes.fr/hal-01326119; https://doi.org/10.1890/14-1834.1

International audience Extreme climatic conditions and their ecological impacts are currently emerging as critical features of climate change. We studied extreme sea ice condition (ESIC) and found it impacts both life-history traits and population dynamics of an Antarctic seabird well beyond ordinary variability. The Southern Fulmar (Fulmarus glacialoides) is an ice-dependent seabird, and individuals forage near the ice edge. During an extreme unfavorable year (when sea ice area is reduced and distance between ice edge and colony is high), observed foraging trips were greater in distance and duration. As a result, adults brought less food to their chicks, which fledged in the poorest body condition. During such unfavorable years, breeding success was extremely low and population growth rate () was greatly reduced. The opposite pattern occurred during extreme favorable years. Previous breeding status had a strong influence on life-history traits and population dynamics, and their responses to extreme conditions. Successful breeders had a higher chance of breeding and raising their chick successfully during the following breeding season as compared to other breeding stages, regardless of environmental conditions. Consequently, they coped better with unfavorable ESIC. The effect of change in successful breeder vital rates on was greater than for other stages' vital rates, except for pre-breeder recruitment probabilities, which most affected . For environments characterized by ordinary sea ice conditions, interindividual differences were more likely to persist over the life of individuals and randomness in individual pathways was low, suggesting individual heterogeneity in vital rates arising from innate or acquired phenotypic traits. Additionally, unfavorable ESIC tended to exacerbate individual differences in intrinsic quality, expressed through differences in reproductive status. We discuss the strong effects of ESIC on Southern Fulmar life-history traits in an evolutionary context. ESICs strongly affect ...