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Primary sex ratio bias in an endangered cooperatively breeding bird, the Black-eared Miner, and its implications for conservation

Ewen, John, Clarke, Rohan, Moysey, Emma, Boulton, Rebecca, Crozier, Ross and Clarke, Michael 2001, Primary sex ratio bias in an endangered cooperatively breeding bird, the Black-eared Miner, and its implications for conservation, Biological conservation, vol. 101, no. 2, pp. 137-145, doi: 10.1016/S0006-3207(01)00022-2.

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Title Primary sex ratio bias in an endangered cooperatively breeding bird, the Black-eared Miner, and its implications for conservation
Author(s) Ewen, John
Clarke, Rohan
Moysey, Emma
Boulton, Rebecca
Crozier, Ross
Clarke, Michael
Journal name Biological conservation
Volume number 101
Issue number 2
Start page 137
End page 145
Publisher Applied Science Publishers
Place of publication Barking, England
Publication date 2001-10
ISSN 0006-3207
1873-2917
Keyword(s) Sex ratio
Cooperative breeding
Conservation
Black-eared miner
Summary The aim of our study was to investigate primary and adult sex ratios in the cooperatively breeding black-eared miner, Manorina melanotis. We used genetic methods to determine the sex of all birds. Observations were made to quantify differences in helping behaviour between the sexes. As in other miners, Manorina spp., non-breeding males provided most of the help in raising young. Male and female nestlings did not differ significantly in weight, suggesting that both sexes are equally costly to produce. Like other miners, the adult sex ratio in black-eared miners is male-biased (64.4%). However, unlike its congeners, the black-eared miner’s primary sex ratio was strongly biased toward females (62.5%). This suggests that females suffer higher juvenile mortality than males. Our study illustrates how understanding sex ratios is both of theoretical interest and relevant to biological conservation.
Language eng
DOI 10.1016/S0006-3207(01)00022-2
Field of Research 050202 Conservation and Biodiversity
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2001, Elsevier Science Ltd.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30009461

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