Impact of human‐induced environmental changes on genetic structure and variability in Atlantic salmon, Salmo salar
Abstract 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...
| Published in: | Fisheries Management and Ecology |
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| Main Authors: | , , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Wiley
2013
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1111/fme.12049 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Ffme.12049 https://onlinelibrary.wiley.com/doi/pdf/10.1111/fme.12049 |
| Summary: | Abstract 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. |
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