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http://dx.doi.org/10.11614/KSL.2020.53.4.365

A Comparative Study on the Information of Zooplankton Community Based on Towing Type and Depth in the Lake Ecosystems  

OH, Hye-Ji (Department of Environmental Science and Engineering, Kyung Hee University)
Chae, Yeon-Ji (Department of Environmental Science and Engineering, Kyung Hee University)
Ku, Doyeong (Department of Environmental Science and Engineering, Kyung Hee University)
Kim, Yu-Jin (Department of Environmental Science and Engineering, Kyung Hee University)
Wang, Jeong-Hyeon (Department of Environmental Science and Engineering, Kyung Hee University)
Choi, Bohyung (Fisheries Science Institute, Chonnam National University)
Ji, Chang Woo (Fisheries Science Institute, Chonnam National University)
Kwak, Ihn-Sil (Fisheries Science Institute, Chonnam National University)
Park, Young-Seuk (Department of Biology, Kyung Hee University)
Nam, Gui-Sook (Rural Research Institute, Korea Rural Community Corporation)
Kim, Yong-Jae (Department of Life Science, Daejin University)
Chang, Kwang-Hyeon (Department of Environmental Science and Engineering, Kyung Hee University)
Publication Information
Abstract
Biomonitoring Survey and Assessment Manual for lake ecosystem suggest zooplankton collection methods to compare relatively the number of species, population density, and community indices, taking into account the convenience of the field sampling according to the sites' water depth. In this study, the oblique towing and 20 m vertical towing methods presented in the manual were respectively compared with the whole water column-vertical towing and we analyzed the differences and characteristics of zooplankton community information gathered by each collection method. For community indices, there was no difference in the comparison of oblique/vertical towing methods in the shallow lake, but in the deep lake, the diversity and richness indices increased when vertically towing through whole water column rather than when limiting the towing depth to 20 m. In addition, the total zooplankton density collected by the oblique/20 m vertical towing methods was about three times higher than the whole water column-vertical towing method, which means that the density of zooplankton community can be overestimated depending on the collection methods. It appears to be results of differences in the zooplankton density by water layer arising from their vertical distribution and in filtered raw water quantity according to the towing depth/distance. Hence, for zooplankton community information to be used as a functional quantitative indicator representing the entire lake, it would be more appropriate to apply the whole water column-vertical towing method with considering the distribution of zooplankton density by depth and contribution rate of each water layer when converting total zooplankton density.
Keywords
zooplankton community; lake ecosystems; quantitative index; oblique/vertical towing methods; towing depth;
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