Human Disturbance of an Avian Scavenging Guild

摘要: In order to investigate the effects of human activities on relationships within foraging guilds, we examined inacanus dynamics eagles, crows, and gulls scavenging spawned salmon in Pacific Northwest. We several hypotheses that postulate asymmetric three guild members reveal influence competition facilitation these relationships. Spatial temporal patterns resource use by primary varied with presence absence activity at experimental feeding stations. At control (undisturbed) stations, eagles preferred feed >100 m from vegetative cover, whereas fed <50 cover. (disturbed) rarely fed, increased both near far Crows often alternate food sources fields adjacent river, especially when carcasses were scarce, did so. also if how behavior single changes or other members. crows stations numbers birds distributed nearer carcasses, they more. emphasize theory lends important insights our understanding disturbance wildlife communities.