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Range expansion and the possibility of an emerging contact zone between two subspecies of Chiffchaff Phylloscopus collybita ssp.

M. C. Hansson, Auteur ; S. Bensch, Auteur ; O. Brannstrom, Auteur

Dans Journal of Avian Biology (31(4) DEC 2000)

The Chiffchaff Phylloscopus collybita is represented in Sweden by two different subspecies; the northern well-established abietinus and the southern recently established collybita which has expanded its range northward during the past two decade[...]

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