Feeding strategies of male and female Herring gulls during the breeding season under various feeding conditions

摘要

Feeding ecology of individually marked male and female Herring gulls breeding at the colony of Tr#xE9;b#xE9;ron (France) has been compared for two successive periods. During the first period (1983#x2013;1988), most of the breeders intensively used a nearby refuse tip which was the main feeding site of the colony. At the refuse tip. food supplies were more abundant and predictable than at the other available feeding sites. In the second period (1989#x2013;1990), an incinerator was running so that the amount of food dumped at the tip decreased by 80.