Abstract
Hadeda Ibis (Bostrychia hagedash) have increased in population size and expanded in range in South Africa possibly as a result of increased use of exotic trees for nesting and roosting in urban areas. We investigated the urban nesting and roosting sites of the Hadeda Ibis by measuring tree height and species used by Hadeda Ibis for nesting and roosting in Pietermaritzburg, KwaZulu-Natal, South Africa. We expected Hadeda Ibis nests and roosts to have habitats, like wetlands, to be within 10 km of the roost or nest tree. Hadeda Ibis nest and roost locations were mapped using ArcGIS and available resources (grasslands, wetlands, plantations, other natural water sources) 10 km around each roost and nest tree were determined. Results showed that Hadeda Ibis use exotic trees for nesting and roosting in urban areas more than indigenous trees. This may be because exotic trees are more available in urban environments, particularly those trees that have ornamental value. Hadeda Ibis did not nest and roost closer to expected resources. Although previously associated with wetlands, Hadeda Ibis in urban environments were not close to natural water sources. This can be explained by swimming pools providing accessible drinking water and well watered lawns providing suitable foraging habitat therefore allowing them to roost and nest in this urban habitat.
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Acknowledgments
Thank you to all persons who responded to newspaper articles and roost requests and the National Research Foundation (ZA) for providing a bursary to P. Singh. Thanks to G. Fuller for equipment to measure tree height. We are grateful for the constructive comments of the reviewers.
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Singh, P., Downs, C.T. Hadeda Ibis (Bostrychia hagedash) urban nesting and roosting sites. Urban Ecosyst 19, 1295–1305 (2016). https://doi.org/10.1007/s11252-016-0541-5
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DOI: https://doi.org/10.1007/s11252-016-0541-5