| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
I tested whether adult male body size and expressions of their representative secondary sexual traits (snout length and hump depth) are positively correlated with adult male proportion (an index of the intensity of sexual selection on males) in five Japanese populations of sea-run masu salmon (Oncorhynchus masou) to verify that sexual selection have driven the evolution of these male reproductive traits in actual animals. Although such positive correlations were not found here, an additional analysis indicated that snout length varied between years (but no inter-year variation in body size and hump depth) in two populations with large sample sizes, suggesting a male life history strategy that plastically changes expressions of secondary sexual traits with relatively low contribution to fertilization success (snout length) according to marine growth conditions.
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