| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2019: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
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| Outline of Final Research Achievements |
Dimorphic colour patterns of the snail shell colour were reported in the Euhadra peliomphala simodae distributed in the Izu islands. Black and white snails are observed in the Izu islands, whereas they are not seen in the Japanese mainland. We conducted a mark-recapture study and found that the survival rates of black and white snails were higher than those of intermediate coloured snails. This result implies that disruptive selection occurs on shell colour. Euhadra peliomphala simodae migrated from the mainland to the Izu islands would have adapted to island environments, and then their colour would have diversified.
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