The effect of revegetation on Silver Gull and Sacred Ibis populations at Winter Swamp, Ballarat.

Winter swamp, 7 km west of Ballarat, was improved as a wetland to encourage breeding birds. Islands, created to enhance the habitat for birds, were quickly colonised by breeding Silver Gulls. Revegetation with trees and shrubs on some islands reduced the breeding population of gulls. Lowest gull nest densities occurred on bare areas and beneath trees. The higher densities were associated with shrubs. Silver Gulls eventually left the revegetated islands which were later colonised by breeding Sacred Ibis. Ibis nested predominantly in Melaleuca ericifolia, Acacia melanoxylon and Eucalyptus species. The high nest density of Sacred Ibis eventually killed some supporting plants.

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