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Impact of human‐induced environmental changes on genetic structure and variability in A tlantic salmon, S almo salar
Author(s) -
Johnsen A.,
Brabrand Å.,
Anmarkrud J. A.,
Bjørnstad G.,
Pavels H.,
Saltveit S. J.
Publication year - 2014
Publication title -
fisheries management and ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 55
eISSN - 1365-2400
pISSN - 0969-997X
DOI - 10.1111/fme.12049
Subject(s) - biology , population , stocking , genetic diversity , effective population size , genetic variability , salmo , zoology , population bottleneck , bottleneck , genetic structure , fish <actinopterygii> , microsatellite , genetic variation , ecology , fishery , genetics , gene , genotype , allele , demography , sociology , computer science , embedded system
The genetic effects on A tlantic salmon, S almo salar L., populations from potential bottleneck situations caused by human activities in two Norwegian rivers, L ærdalselva and B atnfjordelva, were studied by analysing DNA from fish scales collected before and after the populations had been exposed to human‐induced changes: river regulation, G yrodactylus salaris infection and rotenone treatment. Using 15 microsatellites, no significant changes were found in the genetic structure and diversity of four population samples from L ærdalselva collected over 34 years. However, salmon from L ærdalselva were significantly differentiated from nearby ( Å røyelva) and more distant ( B atnfjordelva and S uldalslågen) populations, testifying to the power of the marker system to detect small genetic differences. Furthermore, two population samples from B atnfjordelva, collected 20 years apart, showed low but significant differentiation. The lack of effects on neutral genetic composition in L ærdalselva, despite several potentially severe bottleneck events, indicates that stocking and sea cohorts maintain the status quo of this population.