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Hybrid male sterility between the fresh- and brackish-water types of ninespine stickleback Pungitius pungitius (Pisces, Gasterosteidae)

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タイトル: Hybrid male sterility between the fresh- and brackish-water types of ninespine stickleback Pungitius pungitius (Pisces, Gasterosteidae)
著者: Takahashi, Hiroshi 著作を一覧する
Nagai, Terumi 著作を一覧する
Goto, Akira 著作を一覧する
キーワード: sterility pattern
speciation
flow-cytometry
Haldane's rule
発行日: 2005年 1月
出版者: Zoological Society of Japan
誌名: Zoological Science
巻: 22
号: 1
開始ページ: 35
終了ページ: 40
出版社 DOI: 10.2108/zsj.22.35
抄録: 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).
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/11315
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 後藤 晃

 

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