Líffræðifélag Íslands - biologia.is
Líffræðiráðstefnan 2017

Erindi/veggspjald / Talk/poster E93

Anadromous charr in Iceland – Population structure

Höfundar / Authors: Jóhannes Guðbrandsson1, Benjamín Sigurgeirsson1, Sigurður. J. Guðjónsson2, Sigurður Már Einarsson2, Sigurður S. Snorrason1, Arnar Pálsson1, Zophonías O. Jónsson1.

Starfsvettvangur / Affiliations: 1. Institute of Life and Environmental Sciences, University of Iceland. 2. Marine and Freshwater Research Institute of Iceland.

Kynnir / Presenter: Zophonías O. Jónsson

Landlocked populations of Arctic charr, display large diversity in form and life-history, both between and within lakes which frequently harbor distinct ecomorphs. This phenotypic diversity is partly caused by genetic diversity and partly by phenotypic plasticity typical of salmonids, a factor that may have facilitated the colonization of new territories. In Iceland landlocked populations of Arctic charr are derived from anadromous ancestors but presently anadromous populations are generally considered less diverged. In recent decades many wild salmonid populations have declined. Arctic charr in Iceland shows a decline catches over long periods. Surveys of juveniles in several rivers also show the same pattern. Historically rich and sturdy populations like the one in Hvita in Borgarfjordur may now be on the brink of extinction. Knowledge of the structure of genetic variation in anadromous Arctic charr in Iceland is limited. In the current study we employ ddRAD-sequencing as a method for surveying the genetic diversity within and among anadromous populations in seven rivers from the west, north and east of Iceland. Specifically, we assess relatedness of anadromous populations, evaluate gene-flow among populations and geographic patterns in genetic diversity along the coast of Iceland. We also aim to compare the genetic diversity of anadromous populations with a land-locked population.