I n the minds of many re-searchers, sexual variation is understood as being the differences
exhibited between males and females. However, during the past two decades we have …

The negative co‐variation of life‐history traits such as fecundity and lifespan across species
suggests the existence of ubiquitous trade‐offs. Mechanistically, trade‐offs result from the …

MANY species exhibit colour polymorphisms associated with alternative male reproductive
strategies, including territorial males and'sneaker males' that behave and look like females1 …

This book presents the first unified conceptual and statistical framework for understanding
the evolution of reproductive strategies. Using the concept of the opportunity for sexual …

Why do males and females frequently differ so markedly in body size and morphology? Sex,
Size, and Gender Roles is the first book to investigate the genetic, developmental, and …

We approach conceptual issues in evolutionary biology from an endocrinological
perspective, noting that single hormones typically act on several target tissues and thereby …

We review and discuss the importance of correlational selection (selection for optimal
character combinations) in natural populations. If two or more traits subject to multivariate …

Within a population there are frequently several discrete morphs. While in some cases,
particularly color polymorphisms, this variation can be explained by simple Mendelian …

Phenotypic plasticity is the extent to which an organism can change its physiology,
behaviour, morphology and/or development in response to environmental cues …

The mechanistic bases of natural and sexual selection on physiological and behavioral traits
were examined in male morphs of three colors of the side-blotched lizard, Uta stansburiana …