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팔당호 (八堂湖) 저서성 (底棲性) 대형무척추동물의 (大型無脊椎動物) 군집분석과 (群集分析) 현존량의 계절적 동태
윤일병,공동수,유재근,이상욱 ( Il Byong Yoon,Dong Su Kong,Jae Keun Ryu,Sang Wook Lee ) 한국하천호수학회 1990 생태와 환경 Vol.23 No.1
P`altang reservoir is a streamlike one of which mean depth is low (6.7 m) and water volume is small while its basin area is large comparatively. The broad littoral zone is developed in P`altang reservoir and the aquatic fauna and flora is enriched. Particulary, Mollusks of benthic macroinvertebrates are most abundant in Korean fresh lakes and marshes. This study have been carried out to grasp the community structure and dynamics of standing crops. The results are as follow. 1. The taxa of benthic macroinvertebrates collected from April, 1988 to November, 1989 was 4 phylla 7 classes 19 orders 39 families 82 species. Insects are a dominant taxa in species composition. 2. Annual mean biomass is 10.46 gDW/㎡ (382 ton in total area) as dry weight of tissue except shell. Pelecypods and Gastropods occupy 51% and 35% comparatively, and Mollusks occupies 86%. The largest standing crops is 17.04 gDW/㎡ in last week of September. 3. Variation of standing crops according to water depths is not conspicuous because the inconspicuous water temperature and oxygen concentration gradient can`t limit the growth of benthos. 4. Dominant speicies as standing crops of individuals are Limnodrilus socialis (35%), Chironomus sp. 2 (23%), and Parafossarulus manchouricus (12%); Dominant ones as standing crops of biomass are Anodonta fukudai (28%), Parafossarulus manchouricus (19 %), Unio douglasiae (18%), and Cipangopaludina chinensis (10%). 5. Species diversity (Llyod`s H`) is ranged 1.36∼2.52 and annual mean diversity is 2.16 (β-mesosaprobic).
낙동강 (洛東江) 하구의 이화학적 (理化學的) 요인과 저루성 (底樓性) 대형무척추동물의 군집구조에 관한 연구
윤일병,배경석,공동수 ( Il Byong Yoon,Kyung Seok Bae,Dong Su Kong ) 한국하천호수학회 1987 생태와 환경 Vol.20 No.2
In order to classify the estuary by the salinity content and to examine the macrozoobenthos community structure in the Naktong estuary, we performed this research during the period of June 1985 to April 1986. Quantitative data were investigated through the analysis of individual number (No./0. lm^2), numerical dominance, biomass dominance, species diversity(H`), Bray & Curtis` similarity coefficient and so on. The results obtained are as follows; 1) The estuarine range according to the Venice system is confined from the Kup`o, head of Estuary, to the lower part of changjado. The estuarine area in ranging from the oligohaline to polyhaline. 2) The number of total macrozoobenthos taxa collected from the Naktong estuary was appeared as 89 species, 68 genera, 45 families, 19 orders, 7 classes in 3 phyla. 3) Species occurrence was appeared more abundantly at the tidal flats (in mixo-polyhaline) of the middle and lower reaches than that of upper stream in lowering salinity content. 4) Freshwater species are confined within the region of Mulgum and Jomanp`o. Representative estuarine species are frequently appeared in mixo-oligohaline and mixo-mesohaline and marine species are abundantly appeared in lower stream of estuary where is mixo-polyhaline. 5) Dominant species are different at each studied site. Neanthes japonica, Tylorrhynchus heterochaetus in Polychaeta and Corbicula japonica, Sinnovacula constricta in Pelecypoda appeared as dominant species at mixooligohaline and limnetic waters of the upper stream from the west coast of Ulsukdo (St. 5) to Mulgum. Paranthura japonica, Scopimera globosa in Crustacea appeared as dominant species at mixo-polyhaline waters of lower stream of estuary. 6) Numerical dominance appeared lowest at the tidal flats of the middle and lower reaches of estuary where is much influenced by seawater and Chomanp`o where is not influenced seawater. It was increased in the upper stream of the river. 7) Species diversity index(H`) appeared highest at the tidal flats of the lower stream of estuary and at the upper sites from the west coast of Ulsukdo (St. 5) appeared lowest. 8) Similarity indices are appeared highly between the region of the west coast of Ulsukdo and Mulgum where are lowered in salinity, but those are appeared lower in the region of the lower part of estuary where are high in salinity.