Since the end of the last ice age, about ten thousand years ago, Arctic
charr and Brown trout have invaded and colonized multiple habitats in
Iceland. Ecological studies on Arctic charr have shown extensive
polymorphism in trophic morphology and life history. In some cases
distinct morphs are found in sympatry, such as in Lake Thingvallavatn.
Population genetic analyses and ecological studies indicate parallel
evolution were ecologically processes have led to morphological
divergence which may reflect the initial steps of adaptive speciation.

The researchers of the Arctic charr group investigate ….