| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2009: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2008: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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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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