Translator Disclaimer
1 April 2014 Birth sex in an expanding black rhinoceros ( Diceros bicornis minor) population
Author Affiliations +
Abstract

Despite a now-extensive literature on sex allocation, facultative sex allocation in mammals remains controversial. We studied the complete birth-sex record of a black rhinoceros (Diceros bicornis minor) population from its reintroduction in 1986 through 2008. Neither explicit models of birth sex as Bernoulli trials nor mixed-model logistic regression yielded evidence for an influence on birth sex of birth sequence, maternal identity, year of conception, rainfall, population size, maternal age, or adult sex ratio despite a small female-biased population birth sex ratio that nevertheless appears to be unusual for black rhinoceros. One interpretation of our results is that our study population did not facultatively control birth sex, either because black rhinoceros cannot or because environmental and demographic circumstances did not elicit conditions that favor pronounced adaptive control of birth sex in this population. Alternatively, variation in sex allocation could have occurred in a manner not captured by our modeling or at a scale we could not probe. If the observed female bias is not purely stochastic, it may result from the perturbed age structure of the introductions, which was biased toward subadults.

Peter R. Law, Brad Fike, and Peter C. Lent "Birth sex in an expanding black rhinoceros ( Diceros bicornis minor) population," Journal of Mammalogy 95(2), 349-356, (1 April 2014). https://doi.org/10.1644/13-MAMM-A-175
Received: 19 July 2013; Accepted: 1 December 2013; Published: 1 April 2014
JOURNAL ARTICLE
8 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top