Genetic characterization of hybridization and introgression between anadromous rainbow trout (oncorhynchus mykiss irideus) and coastal cutthroat trout (o. clarki clarki)

William P. Young, Carl O. Ostberg, Paul S Keim, Gary H. Thorgaard

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

Interspecific hybridization represents a dynamic evolutionary phenomenon and major conservation problem in salmonid fishes. In this study we used amplified fragment length polymorphisms (AFLP) and mitochondrial DNA (mtDNA) markers to describe the extent and characterize the pattern of hybridization and introgression between coastal rainbow trout (Oncorhynchus mykiss irideus) and coastal cutthroat trout (O. clarki clarki). Hybrid individuals were initially identified using principle coordinate analysis of 133 polymorphic AFLP markers. Subsequent analysis using 23 diagnostic AFLP markers revealed the presence of F1, rainbow trout backcross, cutthroat trout backcross and later-generation hybrids. mtDNA analysis demonstrated equal numbers of F1 hybrids with rainbow and cutthroat trout mtDNA indicating reciprocal mating of the parental types. In contrast, rainbow and cutthroat trout backcross hybrids always exhibited the mtDNA from the recurrent parent, indicating a male hybrid mating with a pure female. This study illustrates the usefulness of the AFLP technique for generating large numbers of species diagnostic markers. The pattern of hybridization raises many questions concerning the existence and action of reproductive isolating mechanisms between these two species. Our findings are consistent with the hypothesis that introgression between anadromous populations of coastal rainbow and coastal cutthroat trout is limited by an environment-dependent reduction in hybrid fitness.

Original languageEnglish (US)
Pages (from-to)921-930
Number of pages10
JournalMolecular Ecology
Volume10
Issue number4
DOIs
StatePublished - 2001

Fingerprint

Genetic Hybridization
Oncorhynchus clarkii
Trout
Oncorhynchus mykiss
introgression
Polymorphism
Mitochondrial DNA
rainbow
hybridization
mitochondrial DNA
amplified fragment length polymorphism
polymorphism
Fish
Conservation
interspecific hybridization
salmonid
Genetic Markers
Fishes
fitness
genetic markers

Keywords

  • AFLP
  • Genetic markers
  • Interspecific hybridization
  • Oncorhynchus clarki clarki
  • Oncorhynchus mykiss
  • Salmonids

ASJC Scopus subject areas

  • Ecology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry

Cite this

Genetic characterization of hybridization and introgression between anadromous rainbow trout (oncorhynchus mykiss irideus) and coastal cutthroat trout (o. clarki clarki). / Young, William P.; Ostberg, Carl O.; Keim, Paul S; Thorgaard, Gary H.

In: Molecular Ecology, Vol. 10, No. 4, 2001, p. 921-930.

Research output: Contribution to journalArticle

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