The Importance of Human Refuse as a Food Source for Silver Gulls Larus novaehollandiae

Analy s is of regurgitations from Silver Gulls Larus novaehollandiae revealed that only 18% of items were of natural derivation, 82% from human refuse . The proportion of natural food changed through the breeding season , paralleling changes in the number of young chicks in marked plots , which reflected numb e rs in the colon y as a whole .