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Science 21 October 2005:
Vol. 310. no. 5747, p. 401
DOI: 10.1126/science.310.5747.401l
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This Week in Science

In recent decades, the migration patterns of the European blackcap have diversified to include the British Isles in their overwintering habitat. This newly evolved habit has a genetic basis. However, birds using different locations to overwinter often share the same summer breeding territory, and this situation could allow for interbreeding. Bearhop et al. (p. 502; see the news story by Pennisi) show that birds in their breeding grounds mate with birds that have overwintered in the same location. Thus, divergence and ultimately speciation could occur despite overlapping territories. These studies may also reveal one way in which migratory species have responded to climate change.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)