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Accession number;07A0041890
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| Title;Transition of Eutrophic Phenomena in Lake Okutama: Status changes of Plankton |
| Author;
MAKINO IKUYO
(Kyoto Univ., Graduate School of Engineering, JPN)
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Journal Title;Abstracts for Annuals. Disaster Prevention Research Institute, Kyoto University (CD-ROM)
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Journal Code:S0431B
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ISSN:
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VOL.;NO.49;PAGE.NO.49B,105-117(2006)
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| Figure&Table&Reference;FIG.11, TBL.3, REF.7 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Lake Okutama is an artificial lake formed by the Ogochi Dam that blocks the upstream of the Tama River. Analyzing the plankton data of 30 years (1974-2003) at the Ogochi Dam point, this paper characterized the water quality transition that can be divided into three patterns and three periods in terms of the increase of dominant plankton's species. The eutrophication phenomenon according to an increase of cyanbacteria is caused in 2003 of the third pattern. After the enforcement of "Selective withdrawal" in 1992, the species of blue-green alga have been changed at the dam point, the number of planktons has increased and the period of their presence became longer. It was considered that the switch in the discharge water to the upper-layer water was related to the appearance of Anabaena, which indicates the eutrophication. (author abst.) |
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