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Experience buffers extrinsic mortality in a group-living bird species
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology. Univ Zurich, Dept Anthropol;Univ Bern, Inst Ecol & Evolut.ORCID iD: 0000-0002-2220-2637
Univ Zurich, Dept Anthropol;Univ Bern, Inst Ecol & Evolut.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology.
Bournemouth Univ, Fac Sci & Technol, Dept Life & Environm Sci.
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2017 (English)In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 126, no 9, 1258-1268 p.Article in journal (Refereed) Published
Abstract [en]

Extrinsic mortality has a strong impact on the evolution of life-histories, prey morphology and behavioural adaptations, but for many animals the causes of mortality are poorly understood. Predation is an important driver of extrinsic mortality and mobile animals form groups in response to increased predation risk. Furthermore, in many species juveniles suffer higher mortality than older individuals, which may reflect a lower phenotypic quality, lower competitiveness, or a lack of antipredator or foraging skills. Here we assessed the causes of mortality for 371 radio tagged Siberian jays. This sedentary bird species lives in family groups that contain a breeding pair as well as related and unrelated non-breeders. Ninety-five percent of death were due to predation (n = 59 out of 62 individuals) and most individuals were killed by Accipiter hawks. Multivariate Cox proportional hazards models showed that non-breeders had a lower survival than breeders, but only in territories in managed forest with little visual cover. Examining breeders, only sex influenced survival with males having a lower survival than females. For non-breeders, juveniles had lower survival than older non-breeders, and those on managed territories had lower survival than those on unmanaged territories. Additionally, a low feather quality reduced the survival probability of non-breeders only. Thus, living on managed territories and having a low feature quality affected only non-breeders, particularly juveniles. These findings add to previous research demonstrating that juvenile Siberian jays acquire critical antipredator skills from experienced group members. Thus, experience can buffer extrinsic mortality, highlighting that group living not only provides safety in numbers, but also provide social opportunities to learn critical life-skills.

Place, publisher, year, edition, pages
2017. Vol. 126, no 9, 1258-1268 p.
National Category
Ecology Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-334928DOI: 10.1111/oik.04098ISI: 000408908700005OAI: oai:DiVA.org:uu-334928DiVA: diva2:1161794
Funder
Swedish Research CouncilSwedish Research Council FormasLars Hierta Memorial Foundation
Available from: 2017-12-01 Created: 2017-12-01 Last updated: 2017-12-01Bibliographically approved

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Griesser, MichaelBarnaby, JonathanFletcher, KevinKozma, RadoslavLaurila, AnssiNystrand, MagdalenaEkman, Jan

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