Population increase and aspects of colonization of the Tree Sparrow Passer montanus, and its relationships with the House Sparrow Passer domesticus, in the agricultural landscapes of Southern Finland

Abstract

Vepsalainen, V.: Finnish Museum of Natural History, P.O. Box 17, FI-00014 University of Helsinki, Finland. [e-mail] (* Corresponding author) Pakkala, T.: Finnish Museum of Natural History, P.O. Box 17, FI-00014 University of Helsinki, Finland. [e-mail] Tiainen, J.: Finnish Game and Fisheries Research Institute, P.O. Box 2, FI-00791 Helsinki, Finland. [e-mail]