Are Three Protein Genotypes of a Cyprinid Gnathopogon from Lake Ono　Morphologically Different from Each Other?

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  • 山口県小野湖産コイ科魚類モロコGnathopogon の筋肉タンパク質遺伝子型によって分けられる3 型間に形態的差異はあるか
  • ヤマグチケンオノコサン　コイカギョルイ　モロコGnathopogon　ノ　キンニクタンンパクシツイデンシガタ　ニヨッテ　ワケラレル　３ガタカン　ニ　ケイタイテキサイ　ハ　アルカ

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Population of Gnathopogon (Cypriniformes, Cyprinidae) from a dammed reservoir Lake Ono in Yamaguchi Prefecture is estimated to be a hybrid swarm between brookletdwelling G. elongatus and pelagic planktivorous G. caerulescens of Lake Biwa. Alleles on a protein-coding locus Prot-3^* are nearly exclusively fixed to ^*a and ^*b in G. elongatus and G. caerulescens respectively. Gnathopogon from Lake Ono, on the other hand, has both of homozygote and heterozygote genotypes of the alleles in its population, namely aa, ab and bb. Morphological comparison revealed that there are no differences in relative lengths and meristic counts among three genotypes of Gnathopogon from Lake Ono, which supports the hybrid swarm theory.

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