Geographical and temporal variations in body size are common phenomena among
organisms and may evolve within a few years. We argue that body size acts much like a …

Recent climate change has caused diverse ecological responses in plants and animals.
However, relatively little is known about homeothermic animals' ability to adapt to changing …

Background Geographic variation in body size is assumed to reflect adaptation to local
environmental conditions. Although Bergmann's rule is usually sufficient to explain such …

Sex determination of birds is important for many ecological studies but is often difficult in
species with monomorphic plumage. Morphology often provides a possibility for sex …

Weather and climatic conditions may impact on the phenology and morphology of birds, and
thereby affect their survival rate and population dynamics. We examined the North Atlantic …

The morphology of bird wings is subject to a variety of selective pressures, including
migration, predation, habitat structure and sexual selection. Variation in wing morphology …

In this study we explored the linkage between wing size of Great Reed Warbler males
(Acrocephalus arundinaceus) and their habitat selection and relate these linkages to …

Unusual climatic events often lead to intense natural selection on organisms. Whether
episodic selection events result in permanent microevolutionary changes or are reversed by …

Intersexual differences in habitat choice can arise if males and females differ in morphology,
physiology, niche partitioning, or resource use, and can be influenced by variation in habitat …

In this paper, we present an analysis of genetic variation in three wild populations of the
barn swallow, Hirundo rustica. We estimated the P, E, and G matrices for six linear …