Population structure and genetic management of Rio Grande cutthroat trout (Oncorhynchus clarkii virginalis)

V. L. Pritchard, J. L. Metcalf, K. Jones, A. P. Martin, D. E. Cowley

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The Rio Grande cutthroat trout, Oncorhynchus clarkii virginalis, has declined precipitously over the past century, and currently exhibits a highly fragmented distribution within the Canadian, Pecos and Rio Grande river systems of the western United States. The relationships between populations in the three river drainages, and between O. c. virginalis and the closely related taxa O. c. pleuriticus and O. c. stomias, are not well understood. In order to guide management decisions for the subspecies, we investigated the distribution of variation at 12 microsatellite loci and two regions of the mitochondrial genome. We observed a high level of genetic differentiation between O. c. virginalis populations occupying different headwater streams (global Fst = 0.41). However, we found evidence for previous gene flow within the Rio Grande drainage, indicating that inter-population differentiation may have been exacerbated by the recent effects of population fragmentation. Despite large-scale anthropogenic movement of individuals from the Rio Grande into the Canadian and Pecos, the genetic signature of long-term evolutionary independence between the three drainages has been retained.

Original languageEnglish
Pages (from-to)1209-1221
Number of pages13
JournalConservation Genetics
Volume10
Issue number5
DOIs
Publication statusPublished - 15 Aug 2008

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Keywords

  • Conservation genetics
  • Management unit
  • Microsatellite
  • Oncorhynchus clarkii
  • Salmonid
  • Stocking

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