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RESEARCH ARTICLE
Contents Vol 106(1)

Nest concealment but not human visitation predicts predation of New Holland Honeyeater nests

Sarah Lambert A and Sonia Kleindorfer A B
+ Author Affiliations
- Author Affiliations

A School of Biological Sciences, Flinders University, Bedford Park, Adelaide, SA 5042, Australia.

B Corresponding author. Email: sonia.kleindorfer@flinders.edu.au

Emu 106(1) 63-68 https://doi.org/10.1071/MU05006
Submitted: 28 January 2005  Accepted: 10 January 2006   Published: 10 March 2006

Abstract

The vegetation characteristics surrounding 31 New Holland Honeyeater nest-sites were measured in two study sites in the Mount Lofty Ranges, South Australia, to determine if predation outcome (depredated or fledged) covaried with vegetation parameters. We controlled for the influence of human visitation level on nesting outcome through an experimental design, randomly allocating each encountered nest to low or high levels of visitation by the observer. We compared nest vegetation parameters for the two visitation level groups and found no significant differences across experimental treatments. There was also no effect of human visitation level on predation outcome. In contrast, nest-concealment variables (percentage cover above, below, at sides and canopy cover) were significantly related to levels of predation, as revealed using binary logistic regression. In particular, the variable nest concealment to the sides was important for predation outcome, with lower levels of predation at concealed nests. The identity of the nest predators remained unknown.


Acknowledgments

This study was funded by the Birds for Biodiversity Program of the Conservation Council of South Australia through an award to SK and was approved by the Animal Welfare Committee at Flinders University (E190). We thank Belinda Cale for sharing invaluable field knowledge and assistance with nest searches; Steffen Schultz for able nest monitoring; and for short-term assistance in the field, Greg Kerr and Alan Crabb. Our warmest thanks are extended to David Paton, Peter Cale, Belinda Cale and Steffen Schultz for stimulating discussion during the course of the project.


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