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Daejeon, South Korea

Choi J.-W.,Chungnam National University | Han J.-H.,Chungnam National University | Han J.-H.,Research and Promotion Division | Park C.-S.,Chungnam National University | And 7 more authors.
Ecological Engineering | Year: 2015

The objectives of this study were to determine ecological stream health (ESH) and analyze trophic relations of nutrients (N, P) - chlorophyll and macroinvertebrate - fish, which is associated with stream morphology, land-use patterns, and water chemistry. We conducted physical, chemical, and biological surveys at 70 national streams and rivers, and at 40 reference streams. Water chemistry data indicated that ambient nutrient (N, P) levels were influenced by monsoon seasonality and were closely associated with land-use patterns and stream elevation. These factors, in turn, influenced trophic/tolerance guilds, community structures of fish, and the stream health. In the watershed, total phosphorus (TP) was a key determinant of sestonic CHL-a, and the mass ratio TN:TP was determined by phosphorus (R2=0.63, p<0.01) rather than nitrogen (R2=0.01, p>0.05). Proportions of tolerant and omnivorous fish increased with nutrient enrichment and organic matter pollution, while proportions of sensitive and insectivorous fish decreased. The neural network modeling of a self-organizing map (SOM) suggested that clustering of trained SOM units reflected stream morphology, land-use patterns, and water chemistry, which influenced community structures and tolerances of top trophic level fish species in the ecosystem. Lotic ecosystem health, based on a multi-metric approach (MF-IBI model), was clearly demonstrated by a multivariate analysis (PCA); important factors were watershed characteristics (land-use patterns), nutrient levels (N, P), organic matter (BOD, COD) regimes, and biological components (trophic and tolerance guilds). © 2015 Elsevier B.V. Source

Jung S.W.,Research and Promotion Division | Min H.K.,Research and Promotion Division | Kim Y.-H.,Research and Promotion Division | Choi H.A.,Research and Promotion Division | And 3 more authors.
Journal of Asia-Pacific Biodiversity | Year: 2016

Coleoptera is a group of insects that are most diverse among insect resources. Although used as indicator species and applied in developing new drugs, it is difficult to identify them quickly. Since the development of a method using mitochondrial DNA information for identification, studies have been conducted in Korea to swiftly and accurately identify species. The National Science Museum of Korea (NSMK) has been collecting and morphologically identifying domestic reference insects since 2013, and building a database of DNA barcodes with digital images. The NSMK completed construction of a database of digital images and DNA barcodes of 60 beetle species in the Korean National Research Information System. A total of 179 specimens and 60 species were used for the analysis, and the averages of intraspecific and interspecific variations were 0.70±0.45% and 26.34±6.01%, respectively, with variation rates ranging from 0% to 1.45% and 9.83% to 56.23%, respectively. Copyright © 2016, National Science Museum of Korea (NSMK) and Korea National Arboretum (KNA). Production and hosting by Elsevier. This is an open access article under the CC BY-NC-ND license. Source

Hwang H.,Research and Promotion Division | Han J.-H.,Research and Promotion Division | Lee S.,Research and Promotion Division | Ryu Y.M.,Research and Promotion Division | And 3 more authors.
Journal of Asia-Pacific Biodiversity | Year: 2015

Yubudo Island, which is located at the estuary of the Geumgang River, is known to have high biodiversity level. This study investigated the invertebrates fauna in the intertidal regions of Yubudo Island during May 2014 to December 2014. A total of 49 species from 32 families were observed. Among them, arthropods were the most abundant, accounting for 48% of the total with 24 species. A large number of Uca (Austruca) lactea, Endangered Wild Species Class II of Korea, were found on the mud flats in December 2014. Copyright © 2015 National Science Museum of Korea (NSMK) and Korea National Arboretum (KNA). Source

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