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. 2011 Oct 23;7(5):661-3.
doi: 10.1098/rsbl.2011.0115. Epub 2011 Apr 6.

Lekking birds in a tropical forest forego sex for migration

W Alice Boyle  1 , Christopher G Guglielmo, Keith A Hobson, D Ryan Norris
Affiliations

Lekking birds in a tropical forest forego sex for migration

W Alice Boyle et al. Biol Lett. .

Abstract

Facultative, partially migratory animals provide a contemporary window into the evolution of migration, offering rare opportunities to examine the life-history trade-offs associated with migration. For the first time, to our knowledge, we describe the nature of these trade-offs, using a lek-breeding tropical bird, the white-ruffed manakin (Corapipo altera). Previous evidence indicated that weather drives post-breeding migration to lower elevations bringing condition-related benefits. Using elevation-sensitive stable isotope measurements and more than 1200 h of behavioural observations, we show that male manakins which migrate incur costs of diminished social status and matings with females the following breeding season. Because migratory tendency depends on inter-annual variation in weather, physical costs of displays and breeding prospects the following year, migratory decisions are subject to both natural and sexual selection, with the outcome of such decisions linked to changing climatic regimes.

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Figures

Figure 1.
Figure 1.
Relationship between δD values in claws of alpha males and the proportion of time that (a) females visited and (b) alphas attended their leks.
Figure 2.
Figure 2.
Change in male status between the 2008 and 2009 breeding seasons relative to δD values in their claws (indicating migratory tendency) in the intervening non-breeding season. Error bars represent ±1 s.e.m.
See this image and copyright information in PMC

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