| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2017: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Outline of Final Research Achievements |
Young artificial islands created in Attenborough Nature Reserve is an ideal model system to observe initial conditions of communities and evolution. This research is focused on harnessing the miniature archipelago in combination with spiders’ behavioural experiments aimed at addressing the most profound question of how a population and community are created based on behaviours of individuals.
Rapid evolutionary decreases of dispersal tendencies were found through the experiments measuring behaviours against prevailing wind in which spiders shrink their body to stay on land and release silken anchors to brake on water. These behaviours significantly increase through time, hence from younger to older populations/islands, meaning that spider individuals showing staying motivations have remained and settled gradually in populations on the artificial archipelago. Similar tendencies were also found from other behavioural features such as active levels or aggressiveness.
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