| Budget Amount *help |
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
Biodiversity is an important issue in ecology, and the mechanism of its maintenance needs to be clarified. A previous "neutral model" of biodiversity paid particular attention to the balance between immigration and local extinction to explain the diversity, while the role of intra specific effects have been underrepresented. I have developed a new theoretical model that incorporates those effects as the third factor to reveal their role in the maintenance of biodiversity. I have found that mutualism and competition produce a few dominant species and many rare ones, and that prey-predator relations produce many intermediate ones. I also found that the deviation from neutrality is detected effectively by the species-frequency-weighted measures of biodiversity, not by the bare total number of species.
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