Sympatric speciation, the evolution of reproductive isolation without geographic barriers,
remains highly contentious. As a result of new empirical examples and theory, it is now …

ABSTRACT A major goal of evolutionary science is to understand how biological diversity is
generated and altered. Despite considerable advances, we still have limited insight into how …

The salmonid arctic charr Salvelinus alpinus (L.) is one of the most widespread fishes in the
world and is found farther north than any other freshwater or diadromous fish, but also in …

Understanding the extent to which ecological divergence is repeatable is essential for
predicting responses of biodiversity to environmental change. Here we test the predictability …

Most animal species show detectable genetic differentiation between populations, but the
extent and pattern of this differentiation varies considerably between species. Some show …

Abstract In Lake Superior there are three principal forms of lake trout (Salvelinus
namaycush): lean, siscowet and humper. Wild lean and siscowet differ in the shape and …

To assess the population genetic structure of the three‐spined stickleback, Gasterosteus
aculeatus, variability at 18 microsatellite loci was examined in 1724 individuals from 74 …

Two reproductive isolated morphs of Arctic charr (Salvelinus alpinus), termed profundal and
littoral charr according to their different spawning habitats, co-occur in the postglacial lake …

Charrs, fishes of the genus Salvelinus (Salmonidae), comprise about 7–20+ species
important in the ecosystems and fisheries of Arctic and sub-Arctic waters. Charrs vary by life …

Phenotypic plasticity is a developmental process that plays a role as a source of variation for
evolution. Models of adaptive divergence make the prediction that increasing ecological …