We review some recent theoretical and empirical developments in the study of sex allocation
in birds. The advent of reliable molecular sexing techniques has led to a sharp increase in …

Vertebrate sex ratios are notorious for their lack of fit to theoretical models, both with respect
to the direction and the magnitude of the sex ratio adjustment. The reasons for this are likely …

Recent decades have witnessed an explosion of theoretical and empirical studies of sex
allocation, transforming how we understand the allocation of resources to male and female …

When the relative fitness of male and female offspring varies with environmental conditions,
evolutionary theory predicts that parents should adjust the sex of their offspring accordingly …

META-ANALYSIS USES SUMMARY STATISTICS like effect sizes to combine information
from multiple studies. Yet a common problem encountered when collecting information for …

Birds and mammals are sometimes viewed as black sheep, notorious for their failure to pay
attention to the elegance of adaptive sex ratio theory to the same extent as other animals …

Sex ratio theory attempts to explain variation at all levels (species, population, individual,
brood) in the proportion of offspring that are male (the sex ratio). In many cases this work has …

We present quantitative models that unify several adaptive hypotheses for the evolution of
cooperative breeding in a single framework: the ecological constraints hypothesis, the life …

Studies of sex allocation offer excellent opportunities for examining the constraints and limits
on adaptation. A major topic of debate within this field concerns the extent to which the …

Trivers and Willard hypothesized that vertebrates adaptively vary the sex ratio of their
offspring in response to the mother's physical condition [Trivers, RL & Willard, D.(1973) …