2010 Fiscal Year Final Research Report
Latitudinal gradient in sexual selection pressure in the medaka
| Project/Area Number |
20570019
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Ecology/Environment
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| Research Institution | Niigata University |
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Principal Investigator |
YAMAHIRA Kazunori Niigata University, 熱帯生物圏研究センター, 教授 (20322589)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 進化生態・性淘汰 |
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| Research Abstract |
It has been reported that lower-latitude males have more conspicuous secondary sex characteristics in the medaka Oryzias latipes. Laboratory breeding experiments revealed that low-latitude males have higher fin elongation rates but grow slowly, suggesting that the conspicuous secondary sex characteristics are achieved at the expense of fast growth. It was also revealed that low-latitude females tend not to accept males' courtships, indicating that they are more choosy. Probably, these characteristics have been evolved by strong sexual selection due to long breeding seasons at low latitudes.
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[Remarks] ちょっと変だそ!日本の自然,NHK総合テレビ,2010.8.18
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[Remarks] 山平寿智(2011)メダカ属魚類の系統進化と地理的分布にっいて.月刊アクアライフ,2011-5:22-23
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[Remarks] 山平寿智(2011)メダカの尻鰭の形態と機能の緯度間変異にっいて.月刊アクアライフ,2011-5:30-31
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[Remarks] 山平寿智(2009)メダカの系統進化と形態的多様性にっいて.月刊アクアライフ,2009-5:56-57
