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Cooperatively breeding superb fairy-wrens show no facultative manipulation of offspring sex ratio despite plausible benefits

Cockburn, Andrew; Double, Michael


We report a long-term study of offspring sex ratios in the cooperatively breeding superb fairy-wren Malurus cyaneus. Detailed study of this species had revealed a suite of potentially strong selection pressures on the sex ratio. First, females gain substantial fitness benefits from the presence of helpers; so females without male helpers would benefit from any strategy that increased the probability of recruiting help, such as overproduction of sons (local resource enhancement hypothesis), but...[Show more]

CollectionsANU Research Publications
Date published: 2008
Type: Journal article
Source: Behavioral Ecology and Sociobiology
DOI: 10.1007/s00265-007-0492-1


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