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유광일,김원록 ( Kwang Il Yoo,Won Rok Kim ) 한국환경생물학회 1997 환경생물 : 환경생물학회지 Vol.15 No.1
Seasonal variation of Chaetognaths in the coastal waters off Kori, was studied. Samples were collected monthly during the period from March 1988 to February 1989 at 30 stations. Ten species belonging to three genera were identified: Sagitta crassa, S. nagae, S. enflata, S. minima, S. regularis, S. robusta, S. neglecta, S. ferox, Pterosagitta draco and Krohnitta pacifica. Mean abundance of chaetognaths changed monthly from 0 to 165 individuals m^-3. The predominant species varied with month; Sagitta crassa occurred abundantly from April to July, S. enflata from August to November and S. nagae occurred throughout the year except for March.
유광일,김원록 ( Kwang Il Yoo,Won Rok Kim ) 한국환경생물학회 1996 환경생물 : 환경생물학회지 Vol.14 No.2
Studies on the spatial distribution of chaetognaths have been carried out on the based of materials collected in the Yellow Sea in Auguest, 1982. As a result, 5 species belonging to two genera occurred; Sagitta crassa, S. enflata, S. nagae, S. regularis and Krohnitta pacifica. A key to the chaetognaths are given. Sagitta nagae was revealed to be a indicator species of the purturbed area formed by the mixing of the warm water current and neritic waters in summer season in the Yellow Sea.
남극반도 주변 Ice Edge Zone 에서의 하계 모악류의 분포
유광일,김원록,김동엽 ( Kwang Il Yoo,Won Rok Kim,Dong Yup Kim ) 한국환경생물학회 1998 환경생물 : 환경생물학회지 Vol.16 No.1
To study the distribution of chaetognaths in Ice Edge Zone near the Antarctic Peninsula during austral summer, samples were collected at 35 stations between Bransfield Strait and northwestern Weddell Sea from December, 1993 to January, 1994. Chaetognaths were consisted of three species, Enkrohnia hamata, Sagitta gazellae and Sagitta marri. The abundance of chaetognaths was 0∼1,359ind./1000㎥ and high values were observed in the northwestern Weddell Sea. Eukrohnia hamata and Sagitta gazellae were distributed widely in Bransfield Strait and northwestern Weddell Sea. The abundance of Eukrohnia hamata was high in northwestern Weddell Sea but it was dramatically dropped in the Bransfield Strait. The abundance of Sagitta gazellae was high in Gerlache Strait and northwestern Weddell Sea and S. marri was very low and showed restricted distribution. The vertical distribution of chaetognaths were mainly confined to 150m and highest density were found in bottom water.
살충제 영향에 따른 담수산 지각류 Moina irrasa 의 생장과 생식에 관한 연구
유광일,남현우,김세화 ( Kwang Il Yoo,Hyun Woo Nam,Se Wha Kim ) 한국환경생물학회 1998 환경생물 : 환경생물학회지 Vol.16 No.1
To investigate the pesticide effect of a frsh-water cladoceran Moina irrasa, experiments were conducted in three mesocosms with three different pestide concentrations (control, 0.001 ㎖ ℓ^-1, 0.005 ㎖ ℓ^-1) in waters of a rice field in the vicinity of Inchon City (126°43`E, 37°6`N). Water temperature ranged 15.7 to 28.4℃, and pH varied from 7.22 to 8.32 in the control, respectively. Population density of M. irrassa at control ranged from 542 to 2,584 indiv. ℓ^-1. At 0.001㎖ ℓ^-1 and 0.003㎖ ℓ^-1 of pesticide, population density of M. irrassa ranged from 214 to 1,123 and 130 to 1,154indiv. ℓ^-1, respectively. After 4 hours from the experiment, the population density of M. irrasa declined intensively at pesticide treatments, and no individuals were found after 16 hours of the experiment at 0.001 ㎖ ℓ^-1 and after 12 hours at 0.003 ㎖ ℓ^-1. Mean fecundity represented by mean clutch size in terms of the number of embryos per batch at each individual varied between 9.8-17.84 at control, and 12.67-16.48, 15.87-16.64 at 0.001 ㎖ ℓ^-1 and 0.003 ㎖ ℓ^-1, respectively. There were found the individuals only with over 12 embryos at 0.001 ㎖ ℓ^-1 and 0.003 ㎖ ℓ^-1.