Abstract
AbstractThe genetic effects onAtlantic salmon,Salmo salarL., populations from potential bottleneck situations caused by human activities in two Norwegian rivers,Lærdalselva andBatnfjordelva, were studied by analysingDNAfrom fish scales collected before and after the populations had been exposed to human‐induced changes: river regulation,Gyrodactylus salarisinfection and rotenone treatment. Using 15 microsatellites, no significant changes were found in the genetic structure and diversity of four population samples fromLærdalselva collected over 34 years. However, salmon fromLærdalselva were significantly differentiated from nearby (Årøyelva) and more distant (Batnfjordelva andSuldalslågen) populations, testifying to the power of the marker system to detect small genetic differences. Furthermore, two population samples fromBatnfjordelva, collected 20 years apart, showed low but significant differentiation. The lack of effects on neutral genetic composition inLærdalselva, despite several potentially severe bottleneck events, indicates that stocking and sea cohorts maintain the status quo of this population.
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