Topography of the Andes Mountains shapes the wintering distribution of a migratory bird

Diversity and Distributions - Tập 23 Số 2 - Trang 118-129 - 2017
Ana M. González1,2, Nicholas J. Bayly2, Gabriel J. Colorado3, Keith A. Hobson1,4,5
1Department of Biology, University of Saskatchewan, 112 Science Place, Saskatoon SK, S7N 5E2, Canada,
2SELVA: Investigación para la Conservación en el Neotrópico, Bogotá, Colombia
3Universidad Nacional de Colombia sede Amazonia km 2 vía Tarapacá Leticia Colombia
4Department of Biology, University of Western Ontario, 1151 Richmond St N, London, ON N6A 5B7, Canada
5Environment Canada 11 Innovation Boulevard Saskatoon SK S7N 5H5 Canada

Tóm tắt

AbstractAimIn birds, patterns of migratory connectivity are influenced by landscape structure experienced throughout the annual cycle. Assessing how landscape patterns drive the movements and distributions of migratory species is important for understanding the evolution of migration and determining conservation priorities. We determined migratory connectivity in the Canada Warbler (Cardellina canadensis), a declining Neotropical migratory bird, and evaluated the degree to which the Andean mountains influence winter population distribution in this montane forest specialist.LocationSeven study regions across the Western, Central, and Eastern Andes of Colombia.MethodsWe inferred breeding and natal origins of Canada Warblers overwintering in Colombia by analysing stable hydrogen isotope values (δ2H) in feathers and assigning wintering populations to breeding origins using an established feather δ2H isoscape for North America.ResultsWe found strong evidence for parallel migration between breeding and wintering sites, giving rise to moderately strong migratory connectivity between breeding and wintering regions. The model best explaining population distribution in the Colombian Andes implied that populations were most similar within basins or valleys. Such segregation is notable, given that basins are separated by less than 300 km on the wintering grounds, while breeding populations may be separated by more than 3000 km from east to west.Main conclusionsOur results suggest that the high spine of each Andean cordillera acts to shape the winter distribution of individuals from different breeding populations. To our knowledge, this is the first demonstration that the topography of the Andean mountains can act to shape the winter distribution of populations of a migratory bird. The strength of migratory connectivity found in Canada Warblers may inhibit evolutionary responses to environmental change, and the more rapid population declines recorded in some eastern breeding populations may be related to habitat loss and local environmental conditions in the Eastern Andes, where individuals from these populations were more likely to overwinter.

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