The influence of patterns of food abundance on the breeding seasons and clutch-sizes of Red Wattlebirds and Noisy Friarbirds
Kihoko Tokue A B and Hugh A. Ford A CA Zoology, University of New England, Armidale, NSW 2351, Australia.
B Present address: Laboratory of Animal Ecology, Department of Life Sciences, Faculty of Science, Rikkyo University, Nishi-ikebukuro 3-34-1, Toshima-ku, Tokyo 171-8501, Japan.
C Corresponding author. Email: hford@une.edu.au
Emu 107(2) 151-155 https://doi.org/10.1071/MU06060
Submitted: 14 December 2006 Accepted: 17 May 2007 Published: 21 June 2007
Abstract
Red Wattlebirds (Anthochaera carunculata) typically lay two eggs and have a long breeding season, whereas Noisy Friarbirds (Philemon corniculatus) usually have a clutch of three eggs and a short breeding season. We watched nests over five breeding seasons (1990, 1998–2001) near Armidale, in northern New South Wales, and recorded how frequently adults fed nestlings and removed faecal sacs. We also noted the type and size of food brought to the young. Friarbirds visited young significantly more frequently than Wattlebirds in 1990, but not in the other four years. Friarbirds also brought larger prey than Wattlebirds did, including cicadas, Christmas beetles (Anoplognathus spp.), and unidentified large insects. Wattlebirds fed their young a wide variety of insects as well as substantial amounts of manna. Cicadas and Christmas beetles are abundant from late November to late January, which coincides with the time when Friarbirds are feeding their nestlings and fledglings. This suggests that the short breeding season and large clutch of Friarbirds is a result of the seasonal pattern of their food supply. Wattlebird parents took away fewer faecal sacs, and less frequently visited their young simultaneously than Friarbirds did. This is contrary to what would be expected if the small clutch and long breeding season of Wattlebirds was a result of high nest predation in that species relative to Friarbirds.
Acknowledgements
We are grateful to Stephen Debus, Steve Tremont, Theresa Nano, Julie Strudwick and Susan Wyborn for making observations at nests; to Stuart Cairns for providing statistical advice and Greg Lollback for advice on the graphics; and to Ian Rowley and Eleanor Russell and an anonymous referee for their comments on the manuscript.
Carne, P. B. , Greaves, R. T. G. , and McInnes, R. S. (1974). Insect damage to plantation-grown eucalypts in north coastal New South Wales, with particular reference to Christmas Beetles (Coleoptera: Scarabeidae). Journal of the Australian Entomological Society 13, 189–206.
| Crossref | GoogleScholarGoogle Scholar |
Debus, S. J. S. , and Rose, A. B. (2005). Spring diet of Pied Currawongs at Imbota Nature Reserve, Armidale, New South Wales. Corella 29, 19–21.
Hogstad, O. (2004). Nest defence strategies in the Fieldfare Turdus pilaris: the responses on an avian and a mammalian predator. Ardea 92, 79–84.
Martin, T. (1992). Interaction of nest predation and food limitation in reproductive strategies. Current Ornithology 9, 163–197.
Saunders, A. S. J. , Ambrose, S. J. , and Burgin, S. (1995). Gape width and prey selectivity in the Noisy Friarbird Philemon corniculatus and Red Wattlebird Anthochaera carunculata. Emu 95, 297–300.
Skutch, A. F. (1949). Do tropical birds rear as many young as they can nourish? Ibis 91, 430–455.
Tokue, K. , and Ford, H. A. (2006). Influence of food and nest predation on the life histories of two large honeyeaters. Emu 106, 273–281.
| Crossref | GoogleScholarGoogle Scholar |