| Budget Amount *help |
¥43,550,000 (Direct Cost: ¥33,500,000、Indirect Cost: ¥10,050,000)
Fiscal Year 2017: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2016: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2015: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
Fiscal Year 2014: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
Fiscal Year 2013: ¥10,790,000 (Direct Cost: ¥8,300,000、Indirect Cost: ¥2,490,000)
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| Outline of Final Research Achievements |
Based on Parker, Baker and Smith’s theory (PBS theory) for the evolution of anisogamy, we tested disruptive selection on gamete size. We can expect that more strongly anisogamous species produce larger female gametes. Also, the relationship between the size of male gametes and the degree of anisogamy remains untested. In anisogamous species, the PBS theory predicts that male gametes are soon minimized in size. Because the evolution of isogamy with a gamete of zero size is favoured by selection there must be the minimum size of gametes. In such cases, the degree of anisogamy would not depend on the size of male gametes. We confirmed that, as the degree of anisogamy increases, the size of female gametes increases, and that in strongly anisogamous species, the degree of anisogamy does not depend on male gamete size. These results well support the PBS theory.
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