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조개를 이용한 일본 수와호의 수질개선과 지역발전의 역사
( Okino Tokio ) 한국하천호수학회(구 한국육수학회) 2014 생태와 환경 Vol.47 No.special
Lake Suwa is a natural lake which is well-known for sightseeing and fisheries. It had suffered severe eutrophication during 1960s and 1970s with the occurrence of cyanobacterial blooms and the extinction of some benthic animals. Since 1980 water quality has been improved due to efforts of local government, scientists, and citizens. Of various methods that were attempted to improve the water quality of Lake Suwa biological methods received much attention, because it can improve the lake ecosystem integrity and fisheries in addition to the water quality. The aim of this paper is to introduce the biological methods for water quality improvement that had been employed in Lake Suwa, Japan, and their contribution to the economic benefit of local residents. Until now a significant restoration of water quality has been achieved, but there are insufficient recovery of the sediment and biota due to anoxic hypolimnion of the lake. This study proposed suspended cage culture of bivalves as a feasible method of water quality improvement. Increased grazing by bivalves will contribute to the improvement of water quality and fisheries production, which will contribute both to the ecological restoration and economy of local residents.
Seasonal variations of Microcystis species and toxic heptapeptide microcystins in Lake Suwa
Ho-Dong Park,Mariyo F. Watanabe,Ken-Ichi Harada,Hidetake Hayashi,Tokio Okino 江原大學校 附設 環境硏究所 1992 環境硏究 Vol.9 No.-
Seasonal changes in species composition of Microcystis and amounts of heptapeptide toxin, microcystins were investigated in Lake Suwa from June to October in 1991. Microcystins-RR and -LR were the main components of the toxins contained in bloom samples of Microcystis in Lake Suwa and YR was not detected at all period and of very little quantity. the high values of microcystins were estimated during the exponential growth phase of the bloom, June to 20 July. The highest amount of microcystins-RR and -LR were 121 and 81.6 u g per 100mg cells estimated on 20 July 1991, respectively. The high amounts of toxins were estimated while M. aeruginosa predominated. Meanwhile the lower amounts estimated during the period M. viridis predominated. The dissolved inorganic nitrogen (DIN) concentration may well affect the dominance of M. aeruginosa and M. viridis. Accordingly, the toxins of microcystis may be associated with the DIN concentration.
Hepatotoxic Micocystins and Neurotoxic Anatoxin-a in Cyanobacterial Blooms form Korean Lakes
Park, Ho-Dong,Kim, Bom-Chul,Kim, Enk-Yong,Tokio Okino 江原大學校 附設 環境硏究所 1998 環境硏究 Vol.15 No.-
Cyanovacterial bloom samples were collected in the warm season during 1992-1995 from the 12lakes in Korea. Six species each of Micorcystis and Anabaena, and two of Oscillatoria were identified in these lakes. The cyanotoxins 47 samples collected from the lakes were identified as microcystins-RR, -YR,-LR; desmethyl-7-microcystin-LR(7-DMLR), plus anatoxin-a. Microcystins were the main components of these cyanltlxins, while anatoxin-a was detcted in samples from a few lakes. Thirty-four of the 47 samples, included microcystins and the total amunts of microcystin ranged between 20-1500 ㎍/g freeze-dried bloom material .In four of the 26 samples, the samples contained anatoxin-a, though the amounts varied. The total microcystin concentration in 30 samtles from the lakes was equal to the cellular microcystin in these lakes because no extracellular microcystin was detected. All the lakes except for Lakes Younglang and Mijae are a source of drinkinf water. so the presence of cvanotoxin can be a potential threat and requires more attention to water treatment.