|Budget Amount *help
¥2,200,000 (Direct Cost : ¥2,200,000)
Fiscal Year 1997 : ¥1,100,000 (Direct Cost : ¥1,100,000)
Fiscal Year 1996 : ¥1,100,000 (Direct Cost : ¥1,100,000)
1.The distributins of submerged macrophytes and charophytes were surveyed in Lake Toro, L.Kusharo, L.Shikotsu (Hokkaido), L.Ogawara (Aomori), L.Towada (Aomori & Akita), L.Ashinoko (Kanagawa), L.Biwa (Shiga) and Unagi-ike Pond (Kagoshima), Japan.
2.The Charophyta-flora were round restrictive in relation to the water qality and sediment of lakes.
3.Carring out the phytosociological survey in precisely in L.Ogawara, 21 sepcies were found. Some species of them were threatened ones as Potamogeton paormitanus, P.pectinatus, Ruppia maritima, Najas yezoensis, Ranunclus kadzusensis. Aplying princial component analysis, the first axis was respectively iterpreted to represent hypothetical species able to grow in a polluted habitat.
4.Potamogeton leptocephalus could not be found agin in Unagi-ike Pond.
5.Chara braunii, C.Globularis v.globularis and Nitella fexilis v.flexilis were generally deistributed in lakes of Hokkaido.
6.Chara gloularis v.globularis and Nitella flexilis v.flexilis were found in L.Towada.
7.In L.Biwa, chara zone composed of Nitella flexilis v.flexilis was found only at offshore of Makino-cho town.