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유광일,남현우 ( K . I . Yoo,H . W . Nam ) 한국환경생물학회 1997 환경생물 : 환경생물학회지 Vol.15 No.2
The present study has been carried out to clarify the taxonomy and distribution of the genus Lucifer in Korean waters. The samples were collected during the period from March, 1987 to February, 1989. five species from seven areas of Lucifer were identified : L. chacei, L. hanseni, L. intermedius, L. penicillifer, L. typus, All species were described and illusterated for the first time in Korean waters. From the distributional viewpoint, L. intermedius occurred most abundantly in all areas, but L. typus occurred only in the cheju area. Regionally, all the five species of Lucifer were found in the Cheju area. In Youngkwang area, only one species, L. intermedius occurred.
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.
산성화가 담수산 지각류 Moina irrasa 의 생장에 미치는 영향
유광일,남현후,김세화 ( K I Yoo,H W Nam,S W Kim ) 한국하천호수학회 1996 생태와 환경 Vol.29 No.4
Three mesocosms (natural conditon ; control, pH 6.5, pH 5.0) were settled to investigate the effect of acidification on the biology of Moina irrasa in the vicinity of Inchon City. Water temperature and pH in control fluctuated between 15.7∼28.4℃ and 7.22∼8.32, respectively. No differences of its population density, body shape and fecundity were observed between populatons in control and the mesocosm of pH 6.5 until 12 hours of experiment. Population density of pH 6.5, however, decreased 28∼32% of those in control and the number of egg-carrying animals of pH 6.5 decreased 58∼71% of those in control after 16 hours. Body length (BL) and width (BW) of M. irrasa in pH 6.5 were similar to those in control throughout the 24 hour experiment. In the mesocosm of pH 5.0, M. irrasa could not maintain its population until 12 hours and mean fecundity (12.50∼20.33 embryos per batch) was higher than those in control (9.80∼17.84) and pH 6.5 (8.33∼15.77). Only individuals larger than 1.30mm in BL and 0.96mm in BW were distributed in pH 5.0 during their appearance. M. irrasa seems to be a sensitive species against the acidification and smaller individuals with lower fecundity maybe more sensitive.