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Distribution Pattern of Zooplankton in the Han River Estuary with respect to Tidal Cycle  

Youn, Seok-Hyun (Environment Research Division, East Sea Fisheries Research Institute, NFRDI)
Choi, Joong-Ki (Department of Oceanography, Inha University)
Publication Information
Ocean Science Journal / v.43, no.3, 2008 , pp. 135-146 More about this Journal
Abstract
The monthly distribution of zooplankton communities in Han River estuary was investigated at two stations from July 1998 to June 1999. Monthly mean abundance of total zooplankton varied remarkably, with the range from 20 $indiv.{\cdot}m^{-3}$ to 19,600 $indiv.{\cdot}m^{-3}$. During the study period, dominant species of zooplankton community were dinoflagellate Noctiluca scintillans, copepods Paracalanus indicus, Paracaanus crassirostris, Acartia hongi, Acartia ohtsukai, and meroplanton cirriped larvae. According to tidal states, relative high abundance occurred at high tide without regard to season. The temporal distribution of abundance implied that the reduced salinity probably limited the zooplankton populations and the fluctuations of salinity were an important factor in the variation of abundance. However, the results of salinity tolerance test shows that the variations in salinity do not directly influence the decrease of abundance. This study shows that the relatively high abundance of zooplankton near high tide seems to be related with the expansion of abundant zooplankton inhabiting Incheon coastal waters through tidal currents.
Keywords
zooplankton; Han River estuary; tidal cycle; salinity;
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