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Community Structure of Benthic Macroinvertebrates and Water Quality in the Major Lakes (Lake Sayeon, Lake Daeam, Seonam Reservoir, Lake Hoeya) of Ulsansi  

Lee, Mi-Jin (Nakdong River Environment Center, National Institute of Environment Research)
Kwon, Hyeok-Young (Department of Biological Science, Andong National University)
Lee, Hae-Jin (Nakdong River Environment Center, National Institute of Environment Research)
Seo, Jung-Kwan (Environmental Health Research Department, National Institute of Environment Research)
Lee, Jae-Kwan (Nakdong River Environment Center, National Institute of Environment Research)
Lee, Jong-Eun (Department of Biological Science, Andong National University)
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Abstract
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 $14.2mg\;L^{-1}$, 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 $0.051mg\;L^{-1}$, TP $0.100mg\;L^{-1}$, $NH_3-N\;0.606mg\;L^{-1}$, and $NO_3-N\;0.014mg\;L^{-1}$. 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 ($0.082mg\;L^{-1}$) and $NO_3-N$($0.023mg\;L^{-1}$), 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 $NO_3-N$ 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 $NO_3-N$.
Keywords
Ulsan-si; Lake Sayeon; Lake Daeam; Seonam reservoir; Lake Hoeya; macroinvertebrates;
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