Breeding ecology and bias in offspring sex ratio in little grassbirds (Megalurus gramineus)

McIntosh, Rebecca R., Kats, Romke, Berg, Matthew, Komdeur, Jan and Elgar, Mark A. 2003, Breeding ecology and bias in offspring sex ratio in little grassbirds (Megalurus gramineus), Australian journal of zoology, vol. 51, no. 5, pp. 505-514.


Title Breeding ecology and bias in offspring sex ratio in little grassbirds (Megalurus gramineus)
Author(s) McIntosh, Rebecca R.
Kats, Romke
Berg, Matthew
Komdeur, Jan
Elgar, Mark A.
Journal name Australian journal of zoology
Volume number 51
Issue number 5
Start page 505
End page 514
Total pages 10
Publisher CSIRO
Place of publication Collingwood, Vic.
Publication date 2003
ISSN 0004-959X
1446-5698
Summary Little grassbirds (Megalurus gramineus) are small, sexually monomorphic passerines that live in reed beds, lignum swamps and salt marshes in southern Australia. The breeding biology and patterns of sex allocation of the little grassbird were investigated over a single breeding season. Our observations of this species in the Edithvale Wetland Reserve revealed a highly male-biased population sex ratio, with some breeding territories containing several additional males. Nevertheless, there was little compelling evidence that little grassbirds breed cooperatively. The growth rates of male and female nestlings were similar and, as predicted by theory, there was no overall primary sex ratio bias. However, the primary sex ratio was female-biased early in the breeding season and became increasingly male-biased later in the breeding season.
Language eng
Field of Research 060201 Behavioural Ecology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2003, CSIRO
Persistent URL http://hdl.handle.net/10536/DRO/DU:30025959

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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