Sex Ratio Bias in Managed Populations of Hylobatids

Autor:	Faith Burns, Adrienne Rothenberg, Susan W. Margulis
Rok vydání:	2012
Předmět:	Male biology Offspring Hylobatidae biology.organism_classification Mating system Nomascus leucogenys Nomascus Hylobates biology.animal Animals Biological dispersal Animals Zoo Female Animal Science and Zoology Primate Sex Ratio Ecology Evolution Behavior and Systematics Sex ratio Demography
Zdroj:	Folia Primatologica. 82:224-235
ISSN:	1421-9980 0015-5713
DOI:	10.1159/000335131
Popis:	A number of explanations have been proposed for the occurrence of sex ratio bias in primates, including the Trivers-Willard hypothesis on differential investment, local resource competition or enhancement as a result of sex-biased dispersal, dominance-related advantages conferred on one sex but not the other, and the fragile male hypothesis. However, none of these theories was thought to be applicable to monogamous primate species. Here, we examine data on zoo-housed populations of three hylobatid species to test the null hypothesis of equal sex ratio. We analyzed over 40 years of demographic data on Nomascus leucogenys, Hylobates lar and Symphalangus syndactylus. We identified a strong male-biased birth sex ratio in N. leucogenys. Male infant mortality was consistently higher than female infant mortality for N. leucogenys, but this difference was not significant. We found that prime-age N. leucogenys females (aged 13–20) produced significantly more male offspring than female offspring, and young S. syndactylus females (H. lar and S. syndactylus may also be occurring in N. leucogenys. However, N. leucogenys has not been well studied in the wild. Ecological differences among species may further contribute to these observed patterns.
Databáze:	OpenAIRE
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