Breeding habitat selection in an obligate beach bird: a test of the food resource hypothesis
Anna Cuttriss A , Grainne S. Maguire B , Glenn Ehmke B and Michael A. Weston A CA Centre for Integrative Ecology, School of Life and Environmental Sciences, Faculty of Science, Engineering and the Built Environment, Deakin University, 221 Burwood Highway, Burwood, Vic. 3125, Australia.
B BirdLife Australia, Suite 2-05, The Green Building, 60 Leicester Street, Carlton, Vic. 3052, Australia.
C Corresponding author. Email: mweston@deakin.edu.au
Marine and Freshwater Research 66(9) 841-846 https://doi.org/10.1071/MF14213
Submitted: 21 July 2014 Accepted: 21 November 2014 Published: 18 March 2015
Abstract
The food resource hypothesis of breeding habitat selection in beach-nesting birds suggests that birds breed at sites with more prey to meet the increased energetic requirements associated with breeding. We compare prey resources using pitfall traps and core samples at breeding sites and absence sites of the eastern population of hooded plover, Thinornis rubricollis rubricollis, which, in this part of its range, is a threatened obligate beach bird. Breeding sites had higher abundances, equivalent species richness, and different assemblages of invertebrate prey compared with absence sites. Assemblages at breeding sites were characterised by more isopods, and fewer beetles of the family Phycosecidae. Breeding habitat selection by plovers appears to be associated with selection for sites with more food, and any process that degrades food resources at a site (e.g. kelp harvesting or marine pollution events) may reduce the likelihood of occupancy of that site by breeding birds.
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