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Consecutive cohort effects driven by density-dependence and climate influence early-life survival in a long-lived bird

AuthorsPayo-Payo, Ana; Genovart, Meritxell ; Bertolero, Albert; Pradel, Roger ; Oro, Daniel
Long-lived seabird
Early-life conditions
Density dependence
Issue Date27-Apr-2016
PublisherRoyal Society (Great Britain)
CitationProceedings of the Royal Society. B: Biological sciences 283(1829):20153042 (2016)
AbstractConditions during early life, including maternal cohort effects, can influence the future fitness of individuals. This may be particularly true for longdistance migrating birds, because, apart from conditions experienced by cohorts during rearing, conditions during early life in regions far from breeding grounds may also influence their population dynamics. Very little is known about the fitness consequences of those conditions experienced by juveniles after independence, especially in wild populations and for longlived birds. We used multi-event capture-recapture-recovery models and a unique 26-year dataset for the Audouin’s gull (Larus audouinii) to assess for the first time whether survival was influenced by early conditions, both during the rearing period (i.e. a maternal cohort effect potentially affected by density dependence) and the first winter (i.e. a cohort effect driven by climate when birds disperse to wintering grounds). Our results show that juvenile survivalwas highly sensitive to early-life conditions and that survival decreased with stronger density dependence and harsh climate. The two consecutive cohort effects were of similar magnitude and they may represent a selection filter. Thus, early-life conditions had a strong impact on survival, and neglecting this complexity may hinder our understanding on how populations of long-lived animals fluctuate and respond to perturbations.
Publisher version (URL)http://dx.doi.org/10.1098/rspb.2015.3042
Identifiersdoi: 10.1098/rspb.2015.3042
issn: 1471-2954
Appears in Collections:(IMEDEA) Artículos
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