In species with separate sexes, females and males often differ in their morphology,
physiology and behaviour. Such sex‐specific traits are functionally linked to variation in …

Converging lines of inquiry from across the social and biological sciences target the adult
sex ratio (ASR; the proportion of males in the adult population) as a fundamental population …

Adult sex ratio (ASR) exhibits immense variation in nature, although neither the causes nor
the implications of this variation are fully understood. According to theory, the ASR is …

Whatever the reasons for the evolution of sexual reproduction, it leads to a situation in which
there are two individuals who may have no genetic interest in each other's future, the …

Widespread in North American forest regions including the Rocky Mountains, the Boreal Owl
(Aegolius funereus) was once the most numerous predatory bird in Eurasian boreal forests …

Adult sex ratio (ASR) is a fundamental concept in population demography, and recent theory
suggests that ASR plays a central role in social behavior, mating systems, and parental care …

One of the common assumptions in the study of the evolution of parental care is that trade‐
offs exist between parental investment and other fitness‐related traits. In general, this body …

Recent evidence suggests that female ornaments in birds not only are genetic correlates of
selection on males but may also have evolved by selection acting directly on females …

(Invited Article) Abstract In classical polyandry, sex roles are reversed and a female
reproduces with several males, each of whom raises his offspring with little or no help from …

Parental care often increases the survival of offspring, but it is costly to parents. Because of
this trade-off, a sexual conflict over care arises. The solution to this conflict depends on the …