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Revealing the control of migratory fueling： An integrated approach combining laboratory and field studies in northern wheatears Oenanthe oenanthe

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Current Zoology 2013年第3期59卷 381-392页

作者： Franz BAIRLEIN Volker DIERSCHKE julia delingat Cas EIKENAAR Ivan MAGGINI Marc BULTE Heiko SCHMALJOHANN Institute of Avian Research "Vogelwarte Helgoland" Wilhelmshaven Germany Gavia EcoResearch Toennhaeuser Dorfstr. 20 21423 Winsen (Luhe) Germany Advanced Facility for Avian Research University of Western Ontario 1151 Richmond Street London ON N6G 1G9 Canada

Migratory birds rely on fueling prior to migratory flights. Fueling in migrants is controlled by intrinsic as well as extrinsic factors. From captive studies we have started understanding the internal mechanisms controlling bird migration. Field studies have demonstrated the effects of external factors, such as food availability, weather, competitors, parasites or diseases, on the stopover behavior of migrants. However, an integrated approach is still missing to study coherently how the innate migration program interacts with the varying environmental cues and to estimate the contribution of the innate migration program and the environment to realized migration. The northern wheatearOenanthe oenantheoffers a unique opportunity for integrated studies. It breeds across almost the whole Holarctic with just a “gap” between eastern Canada and Alaska. All breeding populations overwinter in sub-Saharan Africa which makes the northern wheatear one of the most long-distant migratory songbirds with extraordinary long non-stop flights across oceans. It is a nocturnal migrant which travels without parental or social aid/guidance. Thus, young birds rely entirely on endogenous mechanisms of timing, route selection and fueling on their first outbound migration. By establishing indoor housing under controlled conditions the endogenous control mechanisms of northern wheatear migration could be revealed. At the same time, environmental factors controlling fueling could be investigated in the field. On migration wheatears occur in a variety of habitats with sparse vegetation where their stopover behavior could be quantitatively studied in the light of “optimal migration” theory by the use of remote balances, radio-tagging and even experimentally manipulated food availability. The present paper summarizes our approach to understand the control of migration in northern wheatears by combining field and laboratory studies at various spatial and temporal scales, and linking various sub-dis

关键词：内部控制鸟类迁徙实验室水芹北方环境因素粮食供应现场研究

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