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Causes and Consequences of Partial Migration in a Passerine Bird

Author:
  • Arne Hegemann
  • Peter P Marra
  • B. Irene Tieleman
Publishing year: 2015
Language: English
Pages: 531-546
Publication/Series: American Naturalist
Volume: 186
Issue: 4
Document type: Journal article
Publisher: University of Chicago Press

Abstract english

Many animal species have populations in which some individuals migrate and others remain on the breeding grounds. This phenomenon is called partial migration. Despite substantial theoretical work, empirical data on causes and consequences of partial migration remain scarce, mainly because of difficulties associated with tracking individuals over large spatial scales. We used stable hydrogen isotopes in claw material to determine whether skylarks Alauda arvensis from a single breeding population in the Netherlands had migrated or remained resident in the previous winter and investigated whether there were causes or consequences of either strategy. Age and sex had no influence on the propensity to migrate, but larger individuals were more likely to be residents. The wintering strategy was not fixed within individuals. Up to 45% of individuals measured in multiple years switched strategies. Reproductive parameters were not related to the wintering strategy, but individuals that wintered locally experienced lower future return rates, and this was directly correlated with two independent measures of immune function. Our results suggest that partial migration in skylarks is based neither on genetic dimorphism nor on an age- and sex-dependent condition. Instead, the wintering strategy is related to structural size and immune function. These new insights on causes and consequences of partial migration advance our understanding of the ecology, evolution, and coexistence of different life-history strategies.

Keywords

  • Biological Sciences

Other

Published
  • CAnMove
  • ISSN: 0003-0147