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Conservation Genetics

, Volume 14, Issue 6, pp 1217–1231 | Cite as

Spatio-temporal effects of stray hatchery-reared Atlantic salmon Salmo salar on population genetic structure within a 21 km-long Icelandic river system

  • Leó Alexander GudmundssonEmail author
  • Sigurdur Gudjónsson
  • Gudrún Marteinsdóttir
  • Dennis L. Scarnecchia
  • Anna Kristín Daníelsdóttir
  • Christophe Pampoulie
Research Article

Abstract

Although the tendency of Atlantic salmon Salmo salar to form differentiated populations among rivers and among tributaries within large river systems (>100 km-long) is well documented, much less is known about population structure within small river systems (<30 km-long). In the present study, we investigated the genetic effects of straying of hatchery-reared salmon on population structure and genetic composition within the Ellidaár river system, a small system (21 km total length) in SW Iceland. We analyzed spatial and temporal variation of wild and domesticated samples (farmed and ranched; n = 931) using seven microsatellite loci. Estimates of population differentiation [F ST, genetic tree (D A)] and Bayesian cluster analysis (STRUCTURE) revealed a significant population structure as well as relative long-term temporal stability of the genetic composition in the main river from 1948 to 2005. However, the genetic composition of the tributary populations was unstable and genetically homogenized in recent years. Wild-hatchery hybrids were detected during the influx of strays as well as few years after, suggesting that introgression has changed the genetic composition of the wild populations. More investigations are needed in Iceland and elsewhere on possible fine-scale population differentiation and factors leading to it. Fine-scale population differentiation as observed in the present study has implications for the resolution with which harvest and habitat management of salmon should be conducted. In addition, farming and ranching operations should be located to minimize potential negative effects of strays on wild fish.

Keywords

Atlantic salmon Population structure River system Introgression Hatchery salmon Temporal stability 

Notes

Acknowledgments

We are grateful to Robin S. Waples for valuable comments and discussion during the process of this study. We are also grateful to the editor and two anonymous reviewers for their many critical comments that considerably improved the manuscript. We thank Sigrídur V. Jónsdóttir and our co-workers at the Institute of Freshwater Fisheries and Marine Research Institute for their assistance and support. This study was supported by Orkuveita Reykjavíkur (Reykjavik Power Company) and the Committee of Agriculture Genetic Resources in Iceland.

Supplementary material

10592_2013_510_MOESM1_ESM.docx (170 kb)
Supplementary material 1 (DOCX 171 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Leó Alexander Gudmundsson
    • 1
    Email author
  • Sigurdur Gudjónsson
    • 1
  • Gudrún Marteinsdóttir
    • 2
  • Dennis L. Scarnecchia
    • 3
  • Anna Kristín Daníelsdóttir
    • 4
    • 5
  • Christophe Pampoulie
    • 4
  1. 1.Institute of Freshwater FisheriesReykjavíkIceland
  2. 2.Department of BiologyUniversity of IcelandReykjavíkIceland
  3. 3.Department of Fish and Wildlife SciencesUniversity of IdahoMoscowUSA
  4. 4.Marine Research InstituteReykjavíkIceland
  5. 5.Matís LtdReykjavíkIceland

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