Morphological features

The cross-breeding experiments with exclusively migratory Blackcaps Sylvia atricapilla from southern Germany (with long wings and high body weights) and poorly migratory conspecifics from the Canary Islands (with short wings and low body weights) demonstrated the genetic influence on both characteristics. Wing lengths, as well as body weights, were intermediately expressed in the hybrids (Berthold & Querner 1982a). Similarly, in a later study, hybrids between migratory and non-migratory Blackcap populations, from Moscow and Madeira, showed intermediate values between parental populations in wing length, wing shape and wing area, while in other variables they resembled either parent population (Fiedler 2005).

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