Spread of hybridization between native westslope cutthroat trout, Oncorhynchus clarki lewisi, and nonnative rainbow trout, Oncorhynchus mykiss

Nathaniel P Hitt, Christopher A. Frissell, Clint C. Muhlfeld, Fred W. Altendorf

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

We examined spatial and temporal patterns of hybridization between native westslope cutthroat trout, Oncorhynchus clarki lewisi, and nonnative rainbow trout, O. mykiss, in streams of the Flathead River system in Montana, U.S.A. We detected hybridization in 24 of 42 sites sampled from 1998 to 2001. We found new Oncorhynchus mykiss introgression in seven of 11 sample populations that were determined to be nonhybridized in 1984. Patterns of spatial autocorrelation and linkage disequilibrium indicated that hybridization is spreading among sites and is advancing primarily via post-F1 hybrids. Although hybridized populations were distributed widely throughout the study area, the genetic contribution from O. mykiss decreased with increasing upstream distance from the Flathead River mainstem, suggesting that O. mykiss introgression is spreading in an upstream direction. The spread of hybridization may be constrained more by demographic than by environmental factors, given that (i) hybridized populations generally encompassed the range of environmental variability in nonhybridized populations, and (ii) hybridization status was more strongly associated with neighborhood statistics than measured environmental gradients.

Original languageEnglish (US)
Pages (from-to)1440-1451
Number of pages12
JournalCanadian Journal of Fisheries and Aquatic Sciences
Volume60
Issue number12
DOIs
StatePublished - Dec 1 2003

Fingerprint

Oncorhynchus clarkii
Oncorhynchus
rainbow
Oncorhynchus mykiss
hybridization
Platycephalidae
introgression
rivers
environmental gradient
linkage disequilibrium
autocorrelation
disequilibrium
river system
environmental factor
demographic statistics
statistics
environmental factors
river
sampling

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science

Cite this

Hitt, Nathaniel P ; Frissell, Christopher A. ; Muhlfeld, Clint C. ; Altendorf, Fred W. / Spread of hybridization between native westslope cutthroat trout, Oncorhynchus clarki lewisi, and nonnative rainbow trout, Oncorhynchus mykiss. In: Canadian Journal of Fisheries and Aquatic Sciences. 2003 ; Vol. 60, No. 12. pp. 1440-1451.
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Spread of hybridization between native westslope cutthroat trout, Oncorhynchus clarki lewisi, and nonnative rainbow trout, Oncorhynchus mykiss. / Hitt, Nathaniel P; Frissell, Christopher A.; Muhlfeld, Clint C.; Altendorf, Fred W.

In: Canadian Journal of Fisheries and Aquatic Sciences, Vol. 60, No. 12, 01.12.2003, p. 1440-1451.

Research output: Contribution to journalArticle

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