The effects of culling on the abbeystead and mallowdale gullery

Abstract

Four annual culls had little effect on the size of the area occupied by the Abbeystead ,gullery, but overall nesting density was lowered substantially. The proportion of birds recruited to the breeding population each year was very variable. It seems that at least 30% of birds must be removed annually to hold colony size at the reduced level. © 1983 Taylor & Francis Group, LLC.