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2010 | Vol. 58, nr 3 | 553-562
Tytuł artykułu

Parental provisioning in response to natural variation of brood size in the Black-billed magpie (Pica pica L.) : video analysis of behaviors in the nests

Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Natural selection will favor parents who adjust their effort in relation to the fitness costs and benefits from the current brood. In this study, we investigated how magpie parents adjust provisioning effort based on the number of nestlings in the brood, by analyzing video recordings of begging and feeding behaviors of birds. The number of visits per hour increased with brood size, but the number of feeding events per visit did not. Because of the latter, parental provisioning that a nestling is receiving on average decreased in larger broods. This may be viewed either as an evidence for the limitation of parental provisioning in larger broods, or as an evidence of parental strategy optimizing the brood-size-specific provisioning effort for the current reproductive event as a tradeoff between current and future reproduction. With other aspects of parental provisioning behavior, we did not find clear indication that parent confronts upper limitation in provisioning large broods. Pervisit number of feeding and nestlings. body condition around the time of fledging did not depend on brood size, which implies that parental effort is not at its limit in larger broods. Based on the results, we suggest that the provisioning effort of black-billed magpie parents is better explained by the life-history trade-off model for provisioning.
Wydawca

Rocznik
Strony
553-562
Opis fizyczny
Bibliogr. 33 poz.,Rys., tab.,
Twórcy
autor
autor
autor
  • Institute of Advanced Machinery and Design, School of Mechanical & Aerospace Engineering, Seoul National University, Seoul, Korea ; Laboratory of Behavioral Ecology and Evolution, Department of Biological Sciences, Seoul National University, Seoul, Korea, ekolog@warman.com.pl
Bibliografia
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.baztech-article-BGPK-2913-1536
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