Since Darwin's conception of sexual selection theory, scientists have struggled to identify the
evolutionary forces underlying the pervasive differences between male and female …

Sexual selection is a key component of evolutionary biology. However, from the very
formulation of sexual selection by Darwin, the nature and extent of sexual selection have …

Trade-offs and constraints are inherent to life, and studies of these phenomena play a
central role in both organismal and evolutionary biology. Trade-offs can be defined …

In recent years, scientists have realized that evolution can occur on timescales much shorter
than the" long lapse of ages" emphasized by Darwin—in fact, evolutionary change is …

Bright colors, enlarged fins, feather plumes, song, horns, antlers, and tusks are often highly
sex dimorphic. Why have males in many animals evolved more conspicuous ornaments …

" This book is well worth buying for its detailed summaries of the 25 studies, many of which
are classic long-term projects, and for its insights into the factors determining reproductive …

Ecological opportunity–through entry into a new environment, the origin of a key innovation
or extinction of antagonists–is widely thought to link ecological population dynamics to …

How strong is phenotypic selection on quantitative traits in the wild? We reviewed the
literature from 1984 through 1997 for studies that estimated the strength of linear and …

It is widely agreed that fecundity selection and sexual selection are the major evolutionary
forces that select for larger body size in most organisms. The general, equilibrium view is …

In both biology and the human sciences, social groups are sometimes treated as adaptive
units whose organization cannot be reduced to individual interactions. This group-level view …