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A Study on the Hybridization between Carrion and Hooded Crow in Northwestern Italy
Ornis Scandinavica (Scandinavian Journal of Ornithology)
Vol. 24, No. 1 (Jan. - Mar., 1993), pp. 80-83
Stable URL: http://www.jstor.org/stable/3676414
Page Count: 4
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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.
Ornis Scandinavica (Scandinavian Journal of Ornithology) © 1993 Nordic Society Oikos