Migratory pattern in the genus Circus: sex and age differential migration in Italy

Authors

  • Marco Gustin Conservation Department of LIPU (Italian League for the Protection of Birds)
  • Tommaso Pizzari Department of Animal and Plant Sciences, The University of Sheffield

DOI:

https://doi.org/10.34080/os.v8.22957

Keywords:

migration timing, phenology, age differences, interspecific variation, breeding biology, sexual dimorphism

Abstract

The migratory patterns of Marsh Circus aeruginosus, Pallid C. macrourus, and Montagu's C. pygargus Harrier were studied in spring in south-east Italy. Differences in the time of passage during the season were found between sexes and age classes in all three species. Adult males showed a significant tendency to migrate earlier than females and the latter earlier than juveniles. Also, adult Marsh and Montagu's Harriers passed significantly earlier during the day than second calendar year individuals. Such patterns are explained in the light of the selective pressure exerted on adults to reach the breeding territories early in the reproductive season.

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Published

1998-04-01

Issue

Vol. 8 No. 1–2 (1998)

Section

Research Papers

License

The copyright of each contribution belongs to the author(s), but all contributions are published under a Creative Commons license, so that anyone is free to share and reuse the contribution as long as the copyright holder is attributed. 

How to Cite

Gustin, M., & Pizzari, T. (1998). Migratory pattern in the genus Circus: sex and age differential migration in Italy. Ornis Svecica, 8(1–2), 23-26. https://doi.org/10.34080/os.v8.22957

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