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주기재,김현우,하경,Joo, Gea-Jae,Kim, Hyun-Woo,Ha, Kyong 한국생태학회 1997 Journal of Ecology and Environment Vol.20 No.1
The development of stream ecology, especially the progress of that field in North America, has been briefly reviewed, and stream studies in Korea were analyzed through literature survey. During the last two decades, theoretical advances in stream ecology and understanding of the structure and function of stream ecosystem were made from the studies mainly in North America. Early studies (1960-1970) focused on determination of the environmental factors controlling the distribution and abundance of organisms dwelling in streams. Introduction of conceptual development, such as the functional feeding concept, river continuum concept, and nutrient spiraling was notable in the late 70's and the 80's. For last 20 years, experimentation approaches to apply ecological principles were very fruitful in the understanding of community structure. Even though studies on the stream ecosystem is Korea have a long history, most of works were concentrated on limited subjects: water quality, abundance and distribution of aquatic insects and fishes. Basic ecological attributes of stream organi는 and test of ecological principles have rarely been a subject of research topics. We must concentrate our effort to enhance our understanding of stream and river ecosystem through qualitative, experimental and interdisciplinary approaches.
남부지역 소형 관개용 못들에서의(둠벙) 동물플랑크톤 군집특성 조사 및 평가
김항아 ( Hang Ah Kim ),최종윤 ( Jong Yoon Choi ),김성기 ( Seong Gi Kim ),도윤호 ( Yuno Do ),주기재 ( Gea Jae Joo ),김동균 ( Dong Kyun Kim ),김현우 ( Hyun Woo Kim ) 한국하천호수학회(구 한국육수학회) 2012 생태와 환경 Vol.45 No.4
This study demonstrates the investigation of zooplankton communities (e.g. rotifers, cladocerans and copepods) and environmentally related driving factors (e.g. elevation, area size, water depth, types of dike construction, and bottom substrates). We hypothesized that zooplankton community structure and composition would be influenced by ambient driving forces in different scales of the irrigation ponds (Dumbeong). A total of 66 zooplankton species/groups (56 rotifers, 9 cladocerans, 1 copepods) were found and identified at 45 Dumbeong of Goseong region (i.e. Goseong-gun) in 2011. The rotifers occupied 84.9% of the total zooplankton abundance. We could categorize a clear separation of zooplankton communities into 4 different patterns based on cluster analysis. Zooplankton diversities in Dumbeongs were lower than those in natural ponds or wetlands. In addition, community structure of zooplankton was also simpler and had a broken stick distribution based on SHE analysis. Species composition in each Dumbeong was not significantly discriminated each other. The result of canonical correspondence analysis (CCA) pinpointed that significant influential variables upon zooplankton community were dissolved oxygen percent saturation, pH, and Dumbeong`s material. This study indicated that morphological type of the Dumbeong and its water quality could determine the community structure of zooplankton. Furthermore, the connectivity between ambient habitats and materials could be necessary to be rigorously considered in respect to producing the Dumbeongs to subsidize alternative habitats for wetland ecosystem in freshwater landscape.
김현주,윤해순,김진수,김현우,주기재 ( Hyun Joo Kim,Hae Soon Yoon,Jin Soo Kim,Hyun Woo Kim,Gea Jae Joo ) 한국하천호수학회 1997 생태와 환경 Vol.30 No.4
Effects of light and grazing on the biomass development of periphyton were evaluated using natural and artificial substrata (unglazed tile: 3.7×9.5x2cm) in a partially shaded 2nd order mountain stream. In open canopy (relative light input 20∼50%), a relatively high biomass (chl. a: 9.5±3.0 mg/m^2, n=25) was maintained than that of closed canopy(<6% of light input. 3.2±0.9 mg/m^2, n= 17). Due to shading and frequent rainfalls, biomass was lower during the summer than in the spring and winter. During the spring, colonization of periphyton on artificial substrata occurred faster than in winter and it took a minimum of 5∼6 weeks to reach the biomass of natural substrata (8∼9mg/m^2). When snails were allowed to freely enter the chamber (mean density: 114 ind./m^2) with artificial substrata, biomass accumulation (chl. a, AFDW) was low compared to the snail excluded enclosure (50∼90% of ungrazed substrata). It was concluded that the light input on periphyton biomass In a partially shaded stream played a more important role than glazing.
낙동강(한국)의 세 지류에서 포식 윤충류 개체군 동태 및 초식 윤충류 군집에 미치는 영향
김현우 ( Hyun Woo Kim ),장광현 ( Kwang Hyeon Chang ),신운균 ( Woon Kyun Shin ),라긍환 ( Geung Hwan La ),정광석 ( Kwang Seuk Jeong ),주기재 ( Gea Jae Joo ) 한국하천호수학회 2004 생태와 환경 Vol.37 No.4
The herbivorous rotifers community (Brachionus spp.) and population dynamics of the predator rotifer (Asplanchna spp.) in three tributaries (Kumho R., Nam R., and Hwang R.) of the Nakdong River were evaluated on biweekly intervals from Jan. 2001 and Dec. 2002. High abundance of the herbivorous rotifers (peak density: - ca. >1000 Ind. L^(-1)) was observed from two tributaries (Kumho R. and Nam R.) during the spring and fall seasons, respectively. The high peaks of herbivorous rotifers were not evident in one tributary (Hwang R.). Among the herbivorous rotifers, brachionid rotifers (Brachionus spp. consisting of 7 species) were the characteristic rotifer community in this study. Brachionus spp. tended to occur together with the other perennial species, Asplanchna. Asplanchna was also present while two species of B. angularis and B. calyciflorus were highest in density. Subsequently, two populations (B. angularis and B. calyciflorus) rapidly declined, becoming rare after high peaks of Asplanchna occurred, except in one tributary (Hwang R.). We found community shifts in rotifer groups in mid-spring and mid-fall at the study site. The Asplanchna population could be appeared to play an important role in regulating the rotifer community and total plankton biomass in spring and fall at high trophic levels.
낙동강 하류에서 수서무척추동물에 의한 정수식물의 낙엽분해
김구연(Gu Yeon Kim),주기재(Gea Jae Joo),김현우(Hyun Woo Kim),신건성(Geon Seong Shin),윤해순(Hae Soon Yoon) 한국하천호수학회 2002 생태와 환경 Vol.35 No.3
Leaf litter breakdown rates of the Phragmites australis, Ziznia latifolia and Typha angustifolia were determined at the lower Nakdong River from Nov. 1998 to Sept. 1999. The relationship between leaf litter breakdown of three and abundance of aquatic invertebrates was investigated. Aquatic invertebrates collected in the litterbags were 11 family, 11 species(mean density: 222 ind./㎡, n=792), and Chironomidae was dominant. Mean density of Chironomidae in the litterbags were different according to the aquatic plant species: Z. latifolia(180 ind./㎡, n=264) T. angustifolia(187 ind./㎡, n=264) P. australis(95 ind./㎡, n=264). The breakdown of Z. latifolia was the shortest, and that of T. angustifolia was shorter than P. australis. Overall, the breakdown rate at floating layer was faster than that of submerged layer in all of three species and differences of the breakdown rate between open bags and closed bags were not found.
부산·경상남도의 상류하천의 물리·화학적 특성과 부착조류 생체량의 분포
하경,박성배,김현우,김진수,주기재 ( Kyong Ha,Sung Bae Park,Hyun Woo Kim,Jin Soo Kim,Gea Jae Joo ) 한국하천호수학회 1997 생태와 환경 Vol.30 No.4
Physicochemical characteristics and chlorophyll-a distribution of the epilithon at the 12 sites of 6 headwater streams in Pusan and Kyongsangnam-do province studied bimonthly from April 1994 to March 1995. Even though all study sites shawed softwater nature, the basic limnological parameters showed wide ranges of variation (alkalinity. 6∼16 mgCaCO_3/l; conductivity, 30∼76μS/cm: pH, 6.4∼7.3: TN, 0.5∼2.1 mg/l; TP. 64∼312㎍/l, n=12). Generally, low chlorophyll-a (4.8±1. 1 mg/m^2) was observed from 1st and 2nd order streams, whereas higher chlorophyll-a (22. 1 ±11.5 mg/m^2) was observed from larger streams. The chlorophyll-a in the summer (7.4±5.1 mg/m^2) was lower than that of the winter (14.2±14.5 mg/m^2) due to precipitation and riparian vegetation. Larger streams with high light input tended to have higher chlorophyll-a.
우포늪의 미소갑각류 군집 동태강우량 및 이화학적 요인이 미소갑각류 군집 분포에 미치는 영향
최종윤 ( Choi Jong Yun ),김성기 ( Kim Seong Ki ),나긍환 ( La Geung Hwan ),정광석 ( Jeong Kwang Seuk ),김현우 ( Kim Hyun Woo ),김태규 ( Kim Tae Kyu ),주기재 ( Joo Gea Jae ) 한국하천호수학회 2012 생태와 환경 Vol.45 No.3
The relationships between environmental factors and the dynamics of the microcrus-tacean community, including planktonic or epiphytic or epiphytic cladocerans and copepods, were studied at Upo Wetlands from 2001 to 2010.Among 10 identified cladoceran taxon, epiphytic cladocerans (Alona, Camptocercus, Simocephalus, Diaphanosoma, Sida)and planktonic claadocerans (Bosmina, Ceriodaphnia, Daphnia, Moina, Scapho-leberis) showed distinctive patterns in appearance throughout the year. Overall,epi-phytic cladocerans were more abundant during the aquatic plant development season (May to Nov.),planktonic cladocerans were similarly distributed throughout the sea-sons,but showed a lower density than epiphytic cladocerrans. The seasonal changes in copepods abundance showed a similar seasonal pattern when compared to epiphytic cladocerans. Planktonic cladocerans showed no significant relationship to rainfall and physic-chemical factors, while epiphytic cladocerans exhibited a distinct relationship with rainfall and water temperature(n=120,p<0.01),and a negative relationship with pH and conductivity (n=120,p<0.05).Among the epiphytic cladocerans, the Alona and Diaphanosoma showed a distinctive correlation with environmental factors, and their density was affected by rainfall and water temperature(n=120,p<0.01).Copepods had a positive relationship with rainfall(n=120,p<0.01)and water temperature(n=120,p<0.05).In conclusion, changes in rainfall and water temperature can affect the seasonal changes of microcrustacean community and abundance in Upo Wetlands.