Competition has always been a cornerstone of evolutionary biology, and aggression is the
predominant form of direct competition in animals, but the evolutionary effects of aggression …

The development of a more synthetic approach to understanding spatial patterns in
biogeography, particularly of the way in which these patterns interact, constitutes a major …

A combination of abiotic and biotic factors probably restricts the range of many species.
Recent evolutionary models and tests of those models have asked how a gradual change in …

Despite the importance of divergent selection to the speed of evolution, it remains poorly
understood if divergent selection is more prevalent in the tropics (where species richness is …

Aim We analysed body‐size variation in relation to latitude, longitude, elevation and
environmental variables in Ctenomys (tuco‐tucos), subterranean rodents in the …

Patterns of diversity and turnover in macroorganism communities can often be predicted
from differences in habitat, phylogenetic relationships among species and the geographical …

Highlights•Size-pitch allometry is little studied in songbirds.•We revealed size-pitch allometry
in songs of a small songbird: the willow warbler.•Bigger males (tarsus as proxy for body size) …

We report that a latitudinal cline in intertidal food distribution is associated with the
nonbreeding distribution of the Western Sandpiper (Calidris mauri). This novel result is the …

The variation in cranial size of the crab‐eating f ox C erdocyon thous was analysed in
relation to latitude and several environmental variables throughout its distribution in S outh A …

1. We studied physiological, behavioural and demographic traits of House Wrens
(Troglodytes aedon) in tropical Panama and temperate zone Ohio to explore the hypothesis …