Changes in foraging range of Audouin's Gulls Larus audouinii in relation to a trawler moratorium in the western Mediterranean

被引:30
作者
Arcos, JM
Oro, D
机构
[1] Industria, 25
[2] Dep. de Biologia Animal, Vertebrats, 08028 Barcelona
来源
COLONIAL WATERBIRDS | 1996年 / 19卷 / 01期
关键词
Audouin's Gull; Larus audouinii; foraging range; trawler moratorium; Ebro Delta; Spain;
D O I
10.2307/1521817
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
The effect of a trawler moratorium on the foraging range of Audouin's Gull Larus audouinii was studied in the colony of the Ebro Delta (northwest Mediterranean). Trawlers were excluded from an area within a 110 km radius from the colony. In 1990, the year before the establishment of the moratorium, few gulls were observed from a land-based observation point outside the moratorium zone, while in 1991 and 1992 numbers of gulls significantly increased. Although most of the gulls probably were nonbreeders, breeding gulls were also able to travel long distances to seek food from trawler discharge. Increased foraging range may result in an increased cost of reproduction.
引用
收藏
页码:128 / 131
页数:4
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