Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

A Study on the Hybridization between Carrion and Hooded Crow in Northwestern Italy

Antonio Rolando
Ornis Scandinavica (Scandinavian Journal of Ornithology)
Vol. 24, No. 1 (Jan. - Mar., 1993), pp. 80-83
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3676414
Stable URL: http://www.jstor.org/stable/3676414
Page Count: 4
  • Read Online (Free)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A Study on the Hybridization between Carrion and Hooded Crow in Northwestern Italy
Preview not available

Abstract

A four year study was carried out on the hybridization between Carrion Crow and Hooded Crow in four overlap areas in northwestern Italy, in order to ascertain whether assortative mating occurred. The number of hybrid pairs was lower than expected whereas the number of homomorphic black pairs was higher. Differences between observed and expected frequencies were statistically significant. It is suggested that the low fitness of hybrids is the ultimate reason why individuals should mate assortatively whereas some differences in courtship (such as vocalizations, postures, perception of colour differences) may be one of the proximate factors enabling this.

Page Thumbnails

  • Thumbnail: Page 
80
    80
  • Thumbnail: Page 
81
    81
  • Thumbnail: Page 
82
    82
  • Thumbnail: Page 
83
    83