Hybrid male sterility between the fresh- and brackish-water types of ninespine stickleback Pungitius pungitius (Pisces, Gasterosteidae)
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概要
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Two ecologically distinct forms, fresh- and brackish-water types, of ninespine stickleback co-exist in several freshwater systems on the coast of eastern Hokkaido. Recent genetic analyses of 13 allozyme loci revealed genetic separation between the two types even though their spawning grounds were in close proximity. On the other hand, there is only a small difference in mitochondrial DNA (mtDNA) sequence between the two types suggesting that they diverged quite recently or that mtDNA introgression occurred between them. To test for postzygotic reproductive isolating mechanisms and hybrid mediated gene flow, we examined the viability and reproductive performance of reciprocal F1 hybrids. The hybrids grew to the adult size normally and both sexes expressed secondary sexual characters in the reciprocal crosses. The female hybrids were reciprocally fertile, while the male hybrids were reciprocally sterile. Histological and flow-cytometric analyses of the hybrid testis revealed that the sterility pattern was classified as `gametic sterility,' with gonads of normal size but abnormal spermatogenesis. To our knowledge, the present finding is a novel example of one sex hybrid sterility in the stickleback family (Gasterosteidae).
- 社団法人日本動物学会の論文
- 2005-01-25
著者
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Nagai Terumi
Department of Marine Biology, Graduate School of Marine Science and Technology, Tokai University
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Nagai Terumi
Department Of Biology Faculty Of Science Toyama University
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Takahashi Hiroshi
Ono Limnological Laboratory, Department of Applied Aquabiology, National Fisheries University
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Goto Akira
Laboratory of Breeding Science, Graduate School of Fisheries Sciences, Hokkaido University
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Goto Akira
Laboratory Of Breeding Science Graduate School Of Fisheries Sciences Hokkaido University
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Goto Akira
Laboratory Of Aquatic Breeding Science Faculty Of Fisheries Hokkaido University
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Takahashi Hiroshi
Ono Limnological Laboratory Department Of Applied Aquabiology National Fisheries University
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Goto Akira
Laboratory of Aquaculture Genetics and Genomics, Graduate school of fisheries sciences, Hokkaido University:Field Science Center for Northern Biosphere, Hokkaido University
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