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Introgressive hybridization in fishes: the biochemical evidence

Introgressive hybridization in fishes: the biochemical evidence Biochemical methods can detect variation at individual genetic loci, making possible the direct assessment of natural hybridization and introgression between fish populations. Protein electro‐phoresis has been used to confirm and extend knowledge of many situations where species hybrids have been detected by morphological analyses. New cases of natural hybridization, including some at the subspecies level, have also been identified. Biochemical studies have provided the first conclusive evidence of natural post F1 hybrids and of introgression between fish taxa. The strongest cases for introgression have used a combined analysis of nuclear protein genes and taxaspecific maternally inherited mitochondrial DNA variation. Information on the significance of introgression as a source of gene flow between taxa, particularly below the species level where sympatric subspecies and sibling species are involved, should expand in the future as the numbers and types of nuclear and mitochondrial DNA loci which can be assayed for variation increase. The full importance of introgressive hybridization in speciation may then be understood. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Fish Biology Wiley

Introgressive hybridization in fishes: the biochemical evidence

Journal of Fish Biology , Volume 39 – Dec 1, 1991

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References (141)

Publisher
Wiley
Copyright
Copyright © 1991 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0022-1112
eISSN
1095-8649
DOI
10.1111/j.1095-8649.1991.tb05094.x
Publisher site
See Article on Publisher Site

Abstract

Biochemical methods can detect variation at individual genetic loci, making possible the direct assessment of natural hybridization and introgression between fish populations. Protein electro‐phoresis has been used to confirm and extend knowledge of many situations where species hybrids have been detected by morphological analyses. New cases of natural hybridization, including some at the subspecies level, have also been identified. Biochemical studies have provided the first conclusive evidence of natural post F1 hybrids and of introgression between fish taxa. The strongest cases for introgression have used a combined analysis of nuclear protein genes and taxaspecific maternally inherited mitochondrial DNA variation. Information on the significance of introgression as a source of gene flow between taxa, particularly below the species level where sympatric subspecies and sibling species are involved, should expand in the future as the numbers and types of nuclear and mitochondrial DNA loci which can be assayed for variation increase. The full importance of introgressive hybridization in speciation may then be understood.

Journal

Journal of Fish BiologyWiley

Published: Dec 1, 1991

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