Könsfördelning hos övervintrande brunand Aythya ferinai Erstaviken, Sörmland

• Published in: Ornis Svecica Vol. 13; no. 1; pp. 17 - 23
• Main Author: Söderholm, Svante
• Format: Journal Article
• Language: English
• Published: 01.01.2003

Data on the sex ratio of Pochard Aythya ferina have been collected during eleven consecutive winters (December—February) at Erstaviken (59° 16'N, 18° 15'E) in the vicinity of Stockholm, Sweden. The average fraction of males was 0.89±0.054. No difference in sex ratio was found between diffe...