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Colonial-nesting waterbirds

 A focus on colonial-nesting waterbirds

We’re focusing our research on waterbird species which breed and nest in colonies within wetlands, as they are the main targets for environmental water flow management and policy. The locations of major breeding colonies within the Murray Darling Basin are known and their nests can be easily accessed and surveyed. Evidence also exists that colonial-nesters provide a reasonable model for understanding relationships between water flows and waterbird responses.

Target species

Our target species are the Australian white ibis (Threskiornis molucca), straw-necked ibis (Threskiornis spinicollis) and the royal spoonbill (Platalea regia). Wetlands within the Murray-Darling Basin are major breeding sites for these species. These species have differing diets and habitat requirements, so represent a range of potential feeding and nesting habitats as well as movements within the Basin and Australia.

Within wetlands these species nest in reeds, rushes, lignum or trees in dense colonies, with ibis colonies comprising sometimes tens of thousands of birds. After arriving at the breeding site they seek out a mate; males and females court one another with various displays and behaviours. After finding a mate both sexes flatten and arrange vegetation into a bowl-shaped nest. The pair take it in turns to incubate their eggs and feed and care for young. The behaviour of adults and chicks at the nest, particularly straw-necked ibis and royal spoonbills, is relatively unknown.

 

Royal spoonbills in breeding plumage (Platalea regia). Image credit: Heather McGinness

 

Left: Straw-necked ibis (Threskiornis spinicollis). Right: Australian white ibis (Threskiornis molucca). Image credit: Freya Robinson