| Budget Amount *help |
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2020: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2019: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2018: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
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| Outline of Final Research Achievements |
The evolutionary history of the lineages of terrestrial molluscan communities distributed on islands and freshwater molluscan communities distributed in ancient lakes, mainly in East Asia including Japan, was comprehensively elucidated by molecular phylogeny. In addition to estimating the habitat use of the species in the modern community, fossil records were used to estimate past habitat use and compare it with phylogenetic relationships to infer trends in habitat shifts. The results showed that both terrestrial and freshwater molluscs from "Darwinian island" environments had characteristics that allow for flexible and rapid niche shifts, but significant levels of phylogenetic conservatism were detected as a whole. We conclude that these evolutionary constraints and niche conservatism have a significant influence on the distribution of ecological properties in the community.
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