We studied sex differences in collision mortality in adult Common Terns (Sterna hirundo) at a wind farm in the direct vicinity of a breeding site in Zeebrugge, Belgium in 2005-2007. In total, 64 fatalities were collected and sexed, of which 64% were males. Uneven sex ratio among these birds was most pronounced during the period of incubation and early chick feeding (15 May-15 June), when 78% of the 28 mortalities were male. During prelaying and feeding of young, the sex ratio of mortalities did not differ from equality. We argue that sex-biased collision mortality in Common Terns does not result from morphological differences between the sexes, but rather reflects differences in foraging frequency between males and females during egg-laying and incubation.
Sex-Based Mortality of Common Tern in Farm Collisions
Title: Sex-Based Mortality of Common Tern in Farm Collisions
January 01, 2008
Journal: The Condor
Stienen, E.; Courtens, W.; Everaert, J.; Van de walle, M. (2008). Sex-Based Mortality of Common Tern in Farm Collisions. The Condor, 110(1), 154-157.