Sex‐specific effects of fisheries and climate on the demography of sexually dimorphic seabirds

Autor: Stephen C. Votier, Deborah Pardo, Geoffrey N. Tuck, Richard A. Phillips, Stuart Townley, Roger Pradel, A. G. Wood, Jaume Forcada, Louise Ireland, Richard B. Sherley, Rémi Choquet, Dimas Gianuca
Přispěvatelé: University of Exeter, Environment and Sustainability Institute [Penryn, UK], British Antarctic Survey (BAS), Natural Environment Research Council (NERC), School of Mathematical Sciences, University of Nottingham, University of Nottingham, UK (UON), University of Cape Town, Centre d’Ecologie Fonctionnelle et Evolutive (CEFE), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Université Paul-Valéry - Montpellier 3 (UPVM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut de Recherche pour le Développement (IRD [France-Sud]), Environment and Sustainability Institute, Université Paul-Valéry - Montpellier 3 (UM3)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École pratique des hautes études (EPHE)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)
Rok vydání: 2019
Předmět:
Zdroj: Journal of Animal Ecology
Journal of Animal Ecology, Wiley, 2019, 88 (9), pp.1366-1378. ⟨10.1111/1365-2656.13009⟩
Journal of Animal Ecology, Wiley, 2019, 88 (9), pp.1366-. ⟨10.1111/1365-2656.13009⟩
ISSN: 1365-2656
0021-8790
Popis: International audience; 1. Many animal taxa exhibit sex-specific variation in ecological traits, such as foraging and distribution. These differences could result in sex-specific responses to change, but such demographic effects are poorly understood. 2. Here, we test for sex-specific differences in the demography of northern (NGP, Macronectes halli) and southern (SGP, M. giganteus) giant petrels-strongly sexually size-dimorphic birds that breed sympatrically at South Georgia, South Atlantic Ocean. Both species feed at sea or on carrion on land, but larger males (30% heavier) are more reliant on terrestrial foraging than the more pelagic females. Using multi-event mark-recapture models, we examine the impacts of long-term changes in environmental conditions and commercial fishing on annual adult survival and use two-sex matrix population models to forecast future trends. 3. As expected, survival of male NGP was positively affected by carrion availability, but negatively affected by zonal winds. Female survival was positively affected by meridional winds and El Niño-Southern Oscillation (ENSO), and negatively affected by sea ice concentration and pelagic longline effort. Survival of SGPs did not differ between sexes; however, survival of males only was positively correlated with the Southern Annular Mode (SAM). 4. Two-sex population projections indicate that future environmental conditions are likely to benefit giant petrels. However, any potential increase in pelagic longline fisheries could reduce female survival and population growth. 5. Our study reveals that sex-specific ecological differences can lead to divergent responses to environmental drivers (i.e. climate and fisheries). Moreover, because such effects may not be apparent when all individuals are considered together, ignoring sex differences could underestimate the relative influence of a changing environment on demography. K E Y W O R D S giant petrels, Macronectes giganteus, Macronectes halli, sex-specific effects, sexual size dimorphism, South Georgia, Southern Ocean, survival
Databáze: OpenAIRE
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