Unraveling migratory connectivity of two European diving ducks: a stable isotope approach
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- 作者：Alain Caizergues ; Steven L. Van Wilgenburg…
- 关键词：Breeding origin ; Common pochard ; Deuterium ; Migratory connectivity ; Natal origin ; Stable isotopes ; Tufted duck
- 刊名：European Journal of Wildlife Research
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：62
- 期：6
- 页码：701-711
- 全文大小：
- 刊物类别：Biomedical and Life Sciences
- 刊物主题：Zoology; Ecology; Fish & Wildlife Biology & Management;
- 出版者：Springer Berlin Heidelberg
- ISSN：1439-0574
- 卷排序：62
文摘
Quantifying the strength of migratory connectivity or the degree to which breeding and wintering populations are connected is crucial for conservation and management of migratory birds. Using stable hydrogen isotope ratios of secondary flight feathers (δ2Hf), we assessed the breeding origins/locations of 666 common pochards (Aythya ferina) and 190 tufted ducks (A. fuligula) captured in France during the 2005–2006 and 2008–2009 wintering seasons. Isotopic values of common pochards wintering on Grand-lieu Lake (western France) displayed a marked bimodal spatial distribution supportive of strong contributions of both northern (60–65° of latitude) and central European (45–55° of latitude) origins. According to the temporal distribution of δ2Hf values, the presence of common pochards of northern origin reached a maximum at the peak of the wintering season (December–January). In contrast, tufted duck did not display a clear bimodal pattern in δ2Hf, with individuals displaying a more northerly origin (60–70° of latitude), likely of Russian and Scandinavian origin. First-year individuals had more northern origins than adults, suggesting that either isotopic discrimination differed among age groups or, more probably, that some adults may undergo moult at latitudes lower than that of their breeding ground. Tufted ducks with northerly δ2Hf values were observed early in the season in individuals sampled in eastern France and late in the season in those sampled in western France. The effects of winter severity on the distribution of individuals over the wintering range were supported for the tufted duck with more northerly values recorded during harsh winters. Management implications of these results are discussed.