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Breeding ecology and bias in offspring sex ratio in little grassbirds (Megalurus gramineus)
journal contribution
posted on 2003-01-01, 00:00 authored by R McIntosh, R Kats, Mathew BergMathew Berg, J Komdeur, M ElgarLittle 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.
History
Journal
Australian journal of zoologyVolume
51Issue
5Pagination
505 - 514Publisher
CSIROLocation
Collingwood, Vic.Publisher DOI
ISSN
0004-959XeISSN
1446-5698Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2003, CSIROUsage metrics
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