| Budget Amount *help |
¥15,860,000 (Direct Cost: ¥12,200,000、Indirect Cost: ¥3,660,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2013: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2012: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
|
|---|
| Outline of Final Research Achievements |
Submerged aquatic plants disappeared during late 1950’s in the lakes in plains in Japan, and they have not been recovered yet in most of the lakes. The cause of the decline is attributed to eutrophication and shore protection work, and reeds and fringed water-lilies are planted to decrease COD of lake water. We hypothesized herbicide and red swamp crayfish are suppressing the recovery of the submerged aquatic plants. At the experiment ponds with predators of the crayfish, submerged plants could survive till the intrusion of herbicides. The comparison of water quality before and after the intrusion of submerged plants in Lake Shinji revealed they don’t have ability to purify water. Incubation experiments showed that plantation of reeds ad fringed water-lilies would increase the COD of the lakes.
|
