Variation in body condition of songbirds during breeding season in relation to sex, migration strategy and weather

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Andersson , N , Piha , M , Meller , K , Välimäki , K & Lehikoinen , A 2018 , ' Variation in body condition of songbirds during breeding season in relation to sex, migration strategy and weather ' , Ornis Fennica , vol. 95 , no. 2 , pp. 70-81 .

Title: Variation in body condition of songbirds during breeding season in relation to sex, migration strategy and weather
Author: Andersson, Noora; Piha, Markus; Meller, Kalle; Välimäki, Kaisa; Lehikoinen, Aleksi
Contributor: University of Helsinki, Finnish Museum of Natural History
University of Helsinki, Finnish Museum of Natural History
University of Helsinki, Finnish Museum of Natural History
University of Helsinki, Zoology
University of Helsinki, Finnish Museum of Natural History
Date: 2018
Language: eng
Number of pages: 12
Belongs to series: Ornis Fennica
ISSN: 0030-5685
URI: http://hdl.handle.net/10138/250887
Abstract: Animal body reserves are often linked with demographic parameters such as breeding success and survival. During breeding season individuals face a trade-off between maintaining body reserves and investing in reproduction. Factors influencing the body reserves of species during breeding season are poorly understood. In this study, we used long-term trapping data from Finnish Constant Effort Sites program to evaluate the impact of sex, migration behaviour, and weather on body reserve index (BRI) of old and young birds during breeding season in 20 species. Our main interest was to study how variation in weather conditions influences the BRI of breeding passerine birds. Weather variables did not explain BRI of adults. However, we found that BRI of young birds was weakly negatively connected with mean temperature, but this may have low biological importance. BRI of adult males increased towards the end of August, but female BRI showed a seasonal decline throughout June and July. Breeding females face the peak in physiological stress later thanmales, probably because females lay eggs, and often invest more in incubation and brood rearing thanmales. The seasonal decline caused females to have lower BRI thanmales at the end of the breeding season. This can cause females to be less prepared for the approaching autumnmigration thanmales. Our findings suggest that there are sex-specific changes in BRI during the breeding season, whichmay have carryover effects on other life history events.
Subject: EIDERS SOMATERIA-MOLLISSIMA
KITTIWAKES RISSA-TRIDACTYLA
MIXED-EFFECTS MODELS
LONG-TERM
FICEDULA-HYPOLEUCA
NESTLING CONDITION
HARLEQUIN DUCKS
HABITAT QUALITY
GROWTH-RATES
FAT RESERVES
1181 Ecology, evolutionary biology
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