Electrophoretic examination of the population structure of brown trout, Salmo trutta L., from the Lough Neagh catchment, Northern Ireland

Electrophoretic examination of the population structure of brown trout, Salmo trutta L., from the... Samples of brown trout, Salmo trutia L., from 34 locations throughout the Lough Neagh system in north‐east Ireland were electrophoretically examined for genetic variation at 28 enzyme loci. Patterns of allelic variation at 12 polymorphic loci indicated the existence of genetic differentiation within as well as among several river systems, suggesting the existence of multiple brown trout populations. Significant gene frequency differences were detected over distances as little as 3 km, demonstrating the propensity of this species for microgeographic genetic differentiation. This was confirmed by a hierarchical analysis of genetic variance, some 35% of among‐sample variance being distributed within tributaries. Within Lough Neagh itself significant genetic differentiation was detected between two morphotypes (dollaghan and salmon‐trout) and for one of these (dollaghan) among samples from different years and from different areas of the lough. This suggests the existence of genetically differentiated subpopulations of originating from separate river catchments. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Fish Biology Wiley

Electrophoretic examination of the population structure of brown trout, Salmo trutta L., from the Lough Neagh catchment, Northern Ireland

Journal of Fish Biology, Volume 28 (4) – Apr 1, 1986

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Publisher
Wiley
Copyright
Copyright © 1986 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0022-1112
eISSN
1095-8649
D.O.I.
10.1111/j.1095-8649.1986.tb05183.x
Publisher site
See Article on Publisher Site

Abstract

Samples of brown trout, Salmo trutia L., from 34 locations throughout the Lough Neagh system in north‐east Ireland were electrophoretically examined for genetic variation at 28 enzyme loci. Patterns of allelic variation at 12 polymorphic loci indicated the existence of genetic differentiation within as well as among several river systems, suggesting the existence of multiple brown trout populations. Significant gene frequency differences were detected over distances as little as 3 km, demonstrating the propensity of this species for microgeographic genetic differentiation. This was confirmed by a hierarchical analysis of genetic variance, some 35% of among‐sample variance being distributed within tributaries. Within Lough Neagh itself significant genetic differentiation was detected between two morphotypes (dollaghan and salmon‐trout) and for one of these (dollaghan) among samples from different years and from different areas of the lough. This suggests the existence of genetically differentiated subpopulations of originating from separate river catchments.

Journal

Journal of Fish BiologyWiley

Published: Apr 1, 1986

References

  • Characteristics of the freshwater occurrence of sea trout Salmo trutta in Ireland
    Fahy, Fahy
  • Allozyme evidence for reproductively isolated sympatric populations of brown trout (Salmo trutta L.) in Lough Melvin, Ireland
    Ferguson, Ferguson; Mason, Mason
  • Analysis of gene diversity in subdivided populations
    Nei, Nei
  • Sampling variances of heterozygosity and genetic distance
    Nei, Nei; Roychoudhury, Roychoudhury
  • Reproductive isolation with little genetic divergence in sympatric populations of brown trout (Salmo trutta)
    Ryman, Ryman; Allendorf, Allendorf; Ståhl, Ståhl
  • Reduction of genetic variability in a hatchery stock of brown trout, Salmo trutta L
    Vuorinen, Vuorinen

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