Document Detail

Hybridization dynamics between Colorado's native cutthroat trout and introduced rainbow trout.
MedLine Citation:
PMID:  18238784     Owner:  NLM     Status:  MEDLINE    
Newly formed hybrid populations provide an opportunity to examine the initial consequences of secondary contact between species and identify genetic patterns that may be important early in the evolution of hybrid inviability. Widespread introductions of rainbow trout (Oncorhynchus mykiss) into watersheds with native cutthroat trout (Oncorhynchus clarkii) have resulted in hybridization. These introductions have contributed to the decline of native cutthroat trout populations. Here, we examine the pattern of hybridization between introduced rainbow trout and 2 populations of cutthroat trout native to Colorado. For this study, we utilized 7 diagnostic, codominant nuclear markers and a diagnostic mitochondrial marker to investigate hybridization in a population of greenback cutthroat trout (Oncorhynchus clarkii stomias) and a population of Colorado River cutthroat trout (Oncorhynchus clarkii pleuriticus). We infer that cutthroat-rainbow trout hybrid swarms have formed in both populations. Although a mixture of hybrid genotypes was present, not all genotype combinations were detected at expected frequencies. We found evidence that mitochondrial DNA introgression in hybrids is asymmetric and more likely from rainbow trout than from cutthroat trout. A difference in spawning time of the 2 species or differences in the fitness between the reciprocal crosses may explain the asymmetry. Additionally, the presence of intraspecific cytonuclear associations found in both populations is concordant with current hypotheses regarding coevolution of mitochondrial and nuclear genomes.
Jessica L Metcalf; Matthew R Siegle; Andrew P Martin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2008-01-30
Journal Detail:
Title:  The Journal of heredity     Volume:  99     ISSN:  1465-7333     ISO Abbreviation:  J. Hered.     Publication Date:    2008 Mar-Apr
Date Detail:
Created Date:  2008-03-17     Completed Date:  2008-08-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375373     Medline TA:  J Hered     Country:  United States    
Other Details:
Languages:  eng     Pagination:  149-56     Citation Subset:  IM    
Department of Ecology and Evolutionary Biology, N122 Ramaley Biology, University of Colorado, Boulder, CO 80309, USA.
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MeSH Terms
DNA, Mitochondrial / genetics
Hybridization, Genetic*
Trout / genetics*
Reg. No./Substance:
0/DNA, Mitochondrial

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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