Detecting non-binomial sex allocation when developmental mortality operates
Wilkinson, Richard D. and Kapranas, Apostolos and Hardy, Ian C.W. (2016) Detecting non-binomial sex allocation when developmental mortality operates. Journal of Theoretical Biology, 408 . pp. 167-178. ISSN 1095-8541
Optimal sex allocation theory is one of the most intricately developed areas of evolutionary ecology. Under a range of conditions, particularly under population sub-division, selection favours sex being allocated to offspring non-randomly, generating non-binomial variances of offspring group sex ratios. Detecting non-binomial sex allocation is complicated by stochastic developmental mortality, as offspring sex can often only be identified on maturity with the sex of non-maturing offspring remaining unknown. We show that current approaches for detecting non-binomiality have limited ability to detect non-binomial sex allocation when developmental mortality has occurred. We present a new procedure using an explicit model of sex allocation and mortality and develop a Bayesian model selection approach (available as an R package). We use the double and multiplicative binomial distributions to model over- and under-dispersed sex allocation and show how to calculate Bayes factors for comparing these alternative models to the null hypothesis of binomial sex allocation.
Actions (Archive Staff Only)