Natural hybridization between endangered and introduced species of Pseudorasbora , with their genetic relationships and characteristics inferred from allozyme analyses

Natural hybridization between endangered and introduced species of Pseudorasbora , with their... From 25 populations of Pseudorasbora in Japan, polymorphism at 22 allozyme loci indicated that the level of genetic differentiation between Pseudorasbora parva and Pseudorasbora pumila (D = 0·421–0·517) was greater than that between the two subspecies of P. pumila, P. pumila pumila and P. pumila subsp. (D = 0·164), consistent with morphological differences. While P. parva displayed genetic variation (H = 0·003–0·100) similar to other freshwater fishes, P. pumila pumila and P. pumila subsp. populations showed no genetic variation. In five of the 15 populations collected from the contact zone between P. parva and P. pumila pumila, hybrids were detected by allozyme analyses. All hybrids were presumed to represent the F1 generation, because they were heterozygous at all 12 loci diagnostic between P. parva and P. pumila pumila. Although four populations were characterized by high frequencies of F1 hybrids (c. 40%), only one of the parental species was observed in each case. The results indicated that the two species have hybridized easily under natural conditions, but cannot coexist in the long‐term. It is suggested that continued invasion of P. parva would hasten the extinction of P. pumila pumila. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Fish Biology Wiley

Natural hybridization between endangered and introduced species of Pseudorasbora , with their genetic relationships and characteristics inferred from allozyme analyses

Journal of Fish Biology, Volume 63 (1) – Jul 1, 2003

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Publisher
Wiley
Copyright
Copyright © 2003 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0022-1112
eISSN
1095-8649
D.O.I.
10.1046/j.1095-8649.2003.00146.x
Publisher site
See Article on Publisher Site

Abstract

From 25 populations of Pseudorasbora in Japan, polymorphism at 22 allozyme loci indicated that the level of genetic differentiation between Pseudorasbora parva and Pseudorasbora pumila (D = 0·421–0·517) was greater than that between the two subspecies of P. pumila, P. pumila pumila and P. pumila subsp. (D = 0·164), consistent with morphological differences. While P. parva displayed genetic variation (H = 0·003–0·100) similar to other freshwater fishes, P. pumila pumila and P. pumila subsp. populations showed no genetic variation. In five of the 15 populations collected from the contact zone between P. parva and P. pumila pumila, hybrids were detected by allozyme analyses. All hybrids were presumed to represent the F1 generation, because they were heterozygous at all 12 loci diagnostic between P. parva and P. pumila pumila. Although four populations were characterized by high frequencies of F1 hybrids (c. 40%), only one of the parental species was observed in each case. The results indicated that the two species have hybridized easily under natural conditions, but cannot coexist in the long‐term. It is suggested that continued invasion of P. parva would hasten the extinction of P. pumila pumila.

Journal

Journal of Fish BiologyWiley

Published: Jul 1, 2003

References

  • The genetic structure of fish: differences in the intraspecific distribution of biochemical genetic variation between marine, anadromous, and freshwater species
    Gyllensten, Gyllensten
  • Extinction by hybridization and introgression
    Rhymer, Rhymer; Simberloff, Simberloff
  • A comparison of genetic diversity levels in marine, freshwater, and anadromous fishes
    Ward, Ward; Woodwark, Woodwark; Skibinski, Skibinski

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