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단보 : 울산 지역 주요 호소(사연호, 대암호, 선암저수지, 회야호)의 수질 및 저서성대형무척추동물 군집구조 분석
이미진 ( Mi Jin Lee ),권혁영 ( Hyeok Young Kwon ),이혜진 ( Hae Jin Lee ),서정관 ( Jung Kwan Seo ),이재관 ( Jaek Wan Lee ),이종은 ( Jong Eun Lee ) 한국하천호수학회(구 한국육수학회) 2011 생태와 환경 Vol.44 No.4
To analyze between water quality and community structure of benthic macroinvertebrates, we selected four reservoirs (Lake Sayeon, Lake Daeam, Seonam reservoir and Lake Hoeya) in Ulsan-si and studied them from February 2010 to October 2010. The annual mean BOD (Biochemical Oxygen Demand) in the four lakes was 14.2 mg L-1, and Seonam reservoir had the highest deviation in BOD. The maximum BOD for every lake was in February and their minimum in May, except for Lake Hoeya whose minimum was in July. The means of various nutrients were as follows: TN 0.05 1 mg L-1, TP 0.100mg L-1, NH3-N 0.606mg L-1, and N03-N 0.014mg L-1. The maximum TN was measured in June and the maximum and minimum TP were measured in March and in May respectively in the four lakes. Benthic macroinvertebrates were surveyed in April and October 2010. The number of benthic macroinvertebrates species was in the range of 16~36 and the average number of individuals were 58~208 inds. m-2. Seonam reservoir, which has the highest mean TN (0.082 mg L-1) and NO3-N (0.023 mg L1), had the largest number of species (36 species, 208 inds. m-2). Pearson`s correlation between the number of macro invertebrates species and TN was 0.962 (P<0.05), and between the species and NO3-N was 0.999 (P<0.05). These results show that the number of benthic macroinvertebrates species of the four lakes in Ulsan-si is significantly correlated with TN and NO3-N.
여름철 얕은 저수지의 중앙과 연안에서 동물플랑크톤 군집의 서식지 선택
정현기 ( Hyun Gi Jeong ),서정관 ( Jung Kwan Seo ),이혜진 ( Hae Jin Lee ),이원철 ( Won Choel Lee ),이재관 ( Jaek Wan Lee ) 한국환경생물학회 2010 환경생물 : 환경생물학회지 Vol.28 No.4
The Abundance of zooplankton was studied in the pelagic and the littoral zone in four shallow reservoirs along with the Nakdong river basin of S. Korea. In the pelagic zone, there was a higher zooplankton density (477.5±312.4 ind. L-1) than in the littoral zone during our study period (t=2.337, p?0.05). Overall, Rotifers were the most abundant group in the studied reservoirs. However, there are no significant correlations between the pelagic and the littoral zone in physical and chemical parameters. In the pelagic and the littoral zone, zooplankton density usually increased with increasing density of aquatic plants in the littoral zone. However, this study showed different trends. Although macrophyte abundance was higher in the littoral zone than in the pelagic zone, zooplankton abundance was higher in pelagic zone. Moreover, when macrophytes (Trapa japonica and Spirodela plyrhiza) covered the complete water surface of the reservoir, zooplankton abundance was higher. It appears that comparisons between the pelagic and the littoral zone give important cues on the selection of habitats by zooplankton. It is assumed that a higher density of aquatic plants does not always imply a higher density of zooplankton in the littoral zone. Furthermore, when the water surface was covered with aquatic plants, the zooplankton communities showed the highest density in the pelagic zone. These results imply that habitat selection of the zooplankton community (Rotifers) is influenced by aquatic plant density with an associated decrease in predation pressure during summer.