|Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2019: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2018: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
|Outline of Final Research Achievements
Long-term population and genetic changes of a plankton community in Lake Fukami-ike, Nagano Prefecture were investigated using microfossils and dormant eggs preserved in varved sediments piled up on the lake bottom. The results revealed long-term changes from the formation of the lake in 1662 to the present, and the response of the plankton community to two eutrophication events and fish invasions. Evaluation of the genetic composition of a Daphnia population showed that only a small number of genotypes successfully invaded and that their coexistence was achieved by life history differences related to reproduction. These results provide new insights into the understanding of the long-term dynamics of planktonic communities in lakes.