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Conservation Genetics

, Volume 14, Issue 1, pp 145–158 | Cite as

Brown trout population structure highly affected by multiple stocking and river diversion in a high mountain national park

  • Jens Thaulow
  • Reidar Borgstrøm
  • Manfred HeunEmail author
Research Article

Abstract

Stocking is a widely applied practice for enhancement of fish populations exploited for recreational and commercial uses. In the present study, we investigate the genetic consequences of stocking and river diversion by analyzing 18 microsatellites in 440 brown trout (Salmo trutta L.) from three historical and ten contemporary populations from two river systems in a national park in Norway. Eight sources have been recorded for stocking in this area, but not concurrently. These stocking events took place after historical sampling and river diversion by construction of a barrier and a channel. A complete shift in the genetic structure between historical and contemporary populations was revealed. The genetic differentiation can be explained by stocking with just four non-native sources. The constructed barrier has helped to maintain a fraction of the historical genetic profile. Stocking success is discussed in relation to population exploitation, variation in natural recruitment, and reduced discharge due to river diversion. Our study demonstrates a high vulnerability of natural populations to stocking with non-native fish, of particular importance for fishery management and preservation of native fish.

Keywords

Microsatellites Brown trout Salmo trutta River diversion Stocking Genetic differentiation 

Notes

Acknowledgments

John Gunner Dokk, Markus Sydenham, and Carsten Thaulow Pedersen assisted during field sampling. We thank Arne Bu and Olaf Bu for supplying samples from Nordvatn, Sylfest Laingen for samples from Nordmannslågen, and Odd Terje Sandlund for providing the historical scale samples. We furthermore acknowledge Gunnar Elnan in Eidfjord mountain board, Nils Runar Sporan and Henning Syvertsen in Statkraft, Sverre Tveiten, former at Norwegian directorate for nature management, for information regarding the stocking history, Thrond Haugen for comments on an earlier version of this manuscript, and Marie Davey for improving the English. We are also grateful to two anonymous reviewers whose comments considerably improved the manuscript. Financial support was given by Department of Ecology and Natural Resource Management (INA), Norwegian University of Life Science (UMB) and Statkraft. An unchangeable file containing all data and analyses is stored at UMB.

Supplementary material

10592_2012_438_MOESM1_ESM.docx (15 kb)
Supplementary material 1 (DOCX 14 kb)

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© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  1. 1.Department of Ecology and Natural Resource ManagementNorwegian University of Life SciencesÅsNorway

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