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SEX-BIASED MORTALITY OF COMMON TERNS IN WIND FARM COLLISIONS - Mortalidad Diferencial entre Sexos de Sterna hirundo por Colisiones en Fincas de Producción de Energía Eólica
ERIC W. M. STIENEN, WOUTER COURTENS, JORIS EVERAERT and MARC VAN DE WALLE
Vol. 110, No. 1 (February 2008), pp. 154-157
Published by: American Ornithological Society
Stable URL: http://www.jstor.org/stable/10.1525/cond.2008.110.1.154
Page Count: 4
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Abstract 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.
The Condor © 2008 Cooper Ornithological Society