AustralieFrV1, Main, Exploration, bibRecord, 003C26

Age-specific cost of first reproduction in female southern elephant seals

Identifieur interne : 003C26 ( Main/Exploration ); précédent : 003C25; suivant : 003C27

Age-specific cost of first reproduction in female southern elephant seals

Auteurs : Marine Desprez [Australie] ; Robert Harcourt [Australie] ; Mark A. Hindell [Australie] ; Sarah Cubaynes [Royaume-Uni] ; Olivier Gimenez [France] ; Clive R. Mcmahon [Australie]

Source :

Biology Letters [ 1744-9561 ] ; 2014.

RBID : PMC:4046382

Descripteurs français

KwdFr :
- Animaux, Facteurs de l'âge, Femelle, Mortalité, Phoques (physiologie), Reproduction (physiologie).
MESH :
- physiologie : Phoques, Reproduction.
- Animaux, Facteurs de l'âge, Femelle, Mortalité.

English descriptors

KwdEn :
- Age Factors, Animals, Female, Mortality, Reproduction (physiology), Seals, Earless (physiology).
MESH :
- physiology : Reproduction, Seals, Earless.
- Age Factors, Animals, Female, Mortality.

Abstract

When to commence breeding is a crucial life-history decision that may be the most important determinant of an individual's lifetime reproductive output and can have major consequences on population dynamics. The age at which individuals first reproduce is an important factor influencing the intensity of potential costs (e.g. reduced survival) involved in the first breeding event. However, quantifying age-related variation in the cost of first reproduction in wild animals remains challenging because of the difficulty in reliably recording the first breeding event. Here, using a multi-event capture–recapture model that accounts for both imperfect detection and uncertainty in the breeding status on an 18-year dataset involving 6637 individuals, we estimated age and state-specific survival of female elephant seals (Mirounga leonina) in the declining Macquarie Island population. We detected a clear cost of first reproduction on survival. This cost was higher for both younger first-time breeders and older first-time breeders compared with females recruiting at age four, the overall mean age at first reproduction. Neither earlier primiparity nor delaying primiparity appear to confer any evolutionary advantage, rather the optimal strategy seems to be to start breeding at a single age, 4 years.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4046382

DOI: 10.1098/rsbl.2014.0264
PubMed: 24872464
PubMed Central: 4046382

Affiliations:

Australie, France, Royaume-Uni

Le document en format XML

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<front><div type="abstract" xml:lang="en"><p>When to commence breeding is a crucial life-history decision that may be the most important determinant of an individual's lifetime reproductive output and can have major consequences on population dynamics. The age at which individuals first reproduce is an important factor influencing the intensity of potential costs (e.g. reduced survival) involved in the first breeding event. However, quantifying age-related variation in the cost of first reproduction in wild animals remains challenging because of the difficulty in reliably recording the first breeding event. Here, using a multi-event capture–recapture model that accounts for both imperfect detection and uncertainty in the breeding status on an 18-year dataset involving 6637 individuals, we estimated age and state-specific survival of female elephant seals (<italic>Mirounga leonina</italic>
) in the declining Macquarie Island population. We detected a clear cost of first reproduction on survival. This cost was higher for both younger first-time breeders and older first-time breeders compared with females recruiting at age four, the overall mean age at first reproduction. Neither earlier primiparity nor delaying primiparity appear to confer any evolutionary advantage, rather the optimal strategy seems to be to start breeding at a single age, 4 years.</p>
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Serveur d'exploration sur les relations entre la France et l'Australie

Age-specific cost of first reproduction in female southern elephant seals

Age-specific cost of first reproduction in female southern elephant seals

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki

	Serveur d'exploration sur les relations entre la France et l'Australie
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