Rapid microevolution of migratory behaviour in a wild bird species

@article{Berthold1992RapidMO,
  title={Rapid microevolution of migratory behaviour in a wild bird species},
  author={Peter Berthold and Andreas J. Helbig and Gabriele Mohr and Ulrich Querner},
  journal={Nature},
  year={1992},
  volume={360},
  pages={668-670}
}
THE Blackcap, Sylvia atricapilla, a widespread Palearctic migratory bird, rarely wintered in Britain until the 1950s. The winter population has since increased to several thousand birds1,2. Ringing indicates that these are not British Blackcaps forestalling migration, but birds breeding in Continental Europe reaching Britain on a novel westerly migration route3,4. The proportion of north-western migrants among Blackcaps ringed in parts of Germany and Austria has increased from 0% before 1960 to… 
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New data on the mitochondrial genetic population structure of the Blackcap indicate that population differentiation at the behavioural level is not necessarily related to long periods of geographic isolation (e.g. during ice ages).
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Abstract Migratory movements of facultative migrants are poorly understood due to their irregular and often unpredictable occurrence. However, tracking such movements is important for understanding
HISTORICAL DIVERSIFICATION OF MIGRATION PATTERNS IN A PASSERINE BIRD
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The results show that the interruption of gene flow between migratory and sedentary populations is not necessary for the maintenance of such a polymorphism, and that even the most divergent migratory strategies of a bird species are susceptible to evolution in response to historical environmental changes.
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It is suggested that eastern populations of prevailingly Western migrants, such as Lark Sparrows, may be behaviorally constrained to depart breeding grounds before molt, but may facultatively adjust migration en route.
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Over the past several decades the number of Blackcaps (Sylvia atricapilla) wintering in Britain and Ireland has increased from a few birds to a substantial wintering population involving thousands of
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