The evolution of partial migration in Birds

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Abstract

Partial migration, i.e.when one fraction of the population is migratory and the other sedentary, appears to be a widespread phenomenon among many animal taxa, ranging from insects to higher vertebrates. Partial migration in birds was first documented for several Holarctic populations many decades ago. The evolution and maintenance of this particular migratory system have only recently been more thoroughly examined, but our knowledge and understanding of the problem is still incomplete. Currently, one of the main concerns is the fitness balancing of the two behavioural alternatives, i.e. whether migrants and residents within a population are equally fit or if one of the categories is inferior and making ‘the best of a bad situation’. Closely tied to this question is the proximate regulation of the migratory and sedentary habits. It has been suggested that a social dominance system might be powerful enough to keep this migration system going; alternatively, a pooulation might be divided into two genetically distinct morphs with different preprogrammed Migratory behaviours.

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