NATURAL HYBRIDIZATION BETWEEN PLATICHTHYS STELLATUS AND KAREIUS BICOLORATUS

1 January 1977

journal article
research article
Published by Genetics Society of Japan in The Japanese Journal of Genetics

Vol. 52 (2) , 117-124
https://doi.org/10.1266/jjg.52.117

Abstract

Allelic izosymes were examined in P. stellatus and K. bicoloratus collected in Sendai Bay [Japan]. Of the 32 genetic loci examined, the 9 loci were divergent and the other loci were non-divergent and polymorphic. With 1 exception, all of these divergent loci were polymorphic in P. stellatus but the most common alleles were different from these homozygous in K. bicoloratus. The secondary alleles of these loci were identical to those homozygous in K. bicoloratus. A comparison was made between biochemical and morphological characters to detect natural hybrids in fish populations. The dextral fishes of P. stellatus showed hybrid patterns in all of the 9 divergent loci, indicating that they were F1 hybrids between P. stellatus and K. bicoloratus. From the distribution and frequencies of the secondary alleles in P. stellatus population, an amount of introgression between both species can be estimated.

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