The Ecology of the Common Myna in Urban Nature Reserves in the Australian Capital Territory

Abstract

The Common Myna Acridotheres tristishas increased its population and distribution in Australia since introduction in 1862. It nests in tree hollows and may compete for these resources with native hollow-nesting species. Urban nature reserves comprising open, grassy woodland, with remnant hollow-bearing trees may provide ideal breeding habitat for Common Mynas. This paper examines the ecology of the Common Myna in two such reserves. The birds made extensive use of the reserves for breeding. Feeding activity in reserves (on ground-dwelling invertebrates with some berry feeding) was seasonally variable. Numbers in reserves were highest during the breeding season and lowest over the winter period. Numbers in adjacent suburbs showed the inverse seasonal pattern. There was evidence of differential use of habitat within reserves, with Common Mynas being more prevalent in reserve edges, than in interior or woodland areas. Reproductive performance is compared with published overseas data. Roosting behaviour and defence of territory by Common Mynas are discussed.