Mortality of Fledgling Females Causes Male Bias in the Sex Ratio of Rufous Vangas (Schetba Rufa) in Madagascar

The Rufous Vanga (Schetba rufa) is a cooperative breeder. Although young males typically remain in natal territories, yearling females do not remain, but disperse to breed for themselves. The male-biased sex ratio likely restricts independent reproduction by young males. We analyzed demographic data...

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Published in:The Auk 2003-07, Vol.120 (3), p.700-705
Main Authors: Asai, Shigeki, Yamagishi, Satoshi, Eguchi, Kazuhiro
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description The Rufous Vanga (Schetba rufa) is a cooperative breeder. Although young males typically remain in natal territories, yearling females do not remain, but disperse to breed for themselves. The male-biased sex ratio likely restricts independent reproduction by young males. We analyzed demographic data from a seven-year study of the Rufous Vanga in Madagascar to estimate the mortality for each sex. We also examined the sex ratio at fledging and at hatching, sexing nestlings with DNA analysis on sex chromosomes. Analyses indicated that the biased sex ratio was due to differential mortality of fledglings rather than the bias at birth. We suggest that the delayed dispersal improved survival of auxiliary males.
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title Mortality of Fledgling Females Causes Male Bias in the Sex Ratio of Rufous Vangas (Schetba Rufa) in Madagascar
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