Líf- og umhverfisvísindastofnun

Discerning genetic differences between anadromous Arctic charr populations across Iceland using ddRAD sequencing

Föstudagur, February 23, 2018 - 12:30
Nánari staðsetning: 
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. 


Þú ert að nota: brimir.rhi.hi.is