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Population Ecology

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31.07.2017 | Original article

Disentangling the effects of predation and oceanographic fluctuations in the mortality of two allopatric seabird populations

verfasst von: Nikola Matović, Bernard Cadiou, Daniel Oro, Ana Sanz-Aguilar

Erschienen in: Population Ecology | Ausgabe 3/2017

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Abstract

Life-history traits of migratory seabirds are influenced by changing conditions at breeding and wintering grounds. Climatic conditions and predation are known to impact populations’ survival rates, but few studies examine their effect simultaneously. We used multievent capture–recapture models to assess mortality due to environmental conditions and predation in breeding European storm petrels (Hydrobates pelagicus) in two allopatric colonies (Mediterranean and Atlantic). Predatory mortality at the colonies showed annual variation, being around 0.05 in certain years. Mortality at sea differed between the two oceanic basins, and was lower in the Mediterranean colony [0.11, 95% CI (0.09, 0.14)] when compared to the Atlantic colony [0.18, 95% CI (0.15, 0.22)]. The Western Mediterranean Oscillation index (WeMOi) explained 57% of the temporal variability in mortality of Mediterranean breeders. In comparison, 43% of the temporal variability in mortality of Atlantic breeders was explained by the winter St Helena index (wHIX) and El Niño-Southern Oscillation index (wENSO). Our results suggest that Mediterranean breeders remain in this basin for wintering where they may face lower migratory costs and more favourable environmental conditions. In contrast, Atlantic breeders’ mortality may be due to higher cost of migration, changing upwelling conditions in the Benguela current and heavy storms over their migratory route during La Niña events. This study underlines the importance of modelling separately different causes of mortality when testing the effects of climatic covariates.

Vorheriger Artikel Long-term population trends of Sooty Terns Onychoprion fuscatus: implications for conservation status

Nächster Artikel Winter and summer weather modulate the demography of wild turkeys at the northern edge of the species distribution

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Titel: Disentangling the effects of predation and oceanographic fluctuations in the mortality of two allopatric seabird populations
verfasst von: Nikola Matović
Bernard Cadiou
Daniel Oro
Ana Sanz-Aguilar
Publikationsdatum: 31.07.2017
Verlag: Springer Japan
Erschienen in: Population Ecology / Ausgabe 3/2017
Print ISSN: 1438-3896
Elektronische ISSN: 1438-390X
DOI: https://doi.org/10.1007/s10144-017-0590-5

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