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Food availability modulates differences in parental effort between dispersing and philopatric birds
Univ Lyon, Univ Claude Bernard Lyon 1, Lab Biometr & Biol Evolut, CNRS,UMR 5558, 43 Bd 11 Novembre 1918, F-69622 Villeurbanne, France.;Univ Lausanne Sorge, Dept Ecol & Evolut, CH-1015 Lausanne, Switzerland..
Univ Aberdeen, Sch Biol Sci, Tillydrone Ave, Aberdeen AB24 2TZ, Scotland..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology. Univ Lyon, Univ Claude Bernard Lyon 1, Lab Biometr & Biol Evolut, CNRS,UMR 5558, 43 Bd 11 Novembre 1918, F-69622 Villeurbanne, France..
2017 (English)In: Behavioral Ecology, ISSN 1045-2249, E-ISSN 1465-7279, Vol. 28, no 3, 688-697 p.Article in journal (Refereed) Published
Abstract [en]

Dispersal entails costs and might have to be traded off against other life-history traits. Dispersing and philopatric individuals may thus exhibit alternative life-history strategies. Importantly, these differences could also partly be modulated by environmental variation. Our previous results in a patchy population of a small passerine, the collared flycatcher, suggest that, as breeding density, a proxy of habitat quality, decreases, dispersing individuals invest less in reproduction but maintain a stable oxidative balance, whereas philopatric individuals maintain a high reproductive investment at the expense of increased oxidative stress. In this study, we aimed at experimentally testing whether these observed differences between dispersing and philopatric individuals across a habitat quality gradient were due to food availability, a major component of habitat quality in this system. We provided additional food for the parents to use during the nestling rearing period and we measured subsequent parental reproductive effort (through provisioning rate, adult body mass, and plasmatic markers of oxidative balance) and reproductive output. Density-dependent differences between dispersing and philopatric parents in body mass and fledging success were observed in control nests but not in supplemented nests. However, density-dependent differences in oxidative state were not altered by the supplementation. Altogether, our results support our hypothesis that food availability is responsible for some of the density-dependent differences observed in our population between dispersing and philopatric individuals but other mechanisms are also at play. Our study further emphasizes the need to account for environmental variation when studying the association between dispersal and other traits.

Place, publisher, year, edition, pages
2017. Vol. 28, no 3, 688-697 p.
Keyword [en]
breeding density, dispersal, habitat quality, oxidative stress, parental care, reproductive output
National Category
Ecology Evolutionary Biology Behavioral Sciences Biology
Identifiers
URN: urn:nbn:se:uu:diva-326363DOI: 10.1093/beheco/arx017ISI: 000401942800015OAI: oai:DiVA.org:uu-326363DiVA: diva2:1120977
Available from: 2017-07-07 Created: 2017-07-07 Last updated: 2017-07-07Bibliographically approved

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