Föstudagur, February 23, 2018 - 12:30
N - 131
Benjamín Sigurgeirsson, post-doc at the Faculty of Life and Environmental Sciences, will present his research at the Biology Seminar: The Arctic charr, and related Salvelinus species and subspecies, exhibit great diversity in form and life-history, mainly between different landlocked populations and even within lakes where ecomorphs are found in sympatry. Anadromous charr have on the other hand been considered less diverged, across a great geographic range and can be considered the evolutionary ancestor of various derived landlocked forms. In recent decades declines have been observed in wild salmonid species, Atlantic Salmon, Brown trout, Rainbow trout and Arctic charr, in almost all countries where they are found. The causes are undoubtedly many, ranging from disturbance of waterways and lakes, impact of pollution and dams, impact of aquaculture (genetic contamination or sea lice) to climatic factors induced by rising CO2. In Iceland the decline is severe and historically rich and sturdy Arctic charr populations like Hvítá in Borgarfjörður may now be on the brink of extinction. The main objectives of the current study is to apply ddRAD sequencing as a method to produce data on the genetic diversity in wild Arctic charr. Then to use this data to test for the relatedness of anadromous charr populations, spanning seven rivers from the west, north and east of Iceland and to further assess the genetic diversity in those populations and compare them to a land-locked population. Additionally we will evaluate the potential geneflow between the populations, and see if the genetic diversity shows a geographic pattern along the coast.