Kim, S.H. & J.H. Lee. (1999). Environmental studies of the lower part of Han River, IV. Zooplankton dynamics. Korean Journal of Limnology. 32(1):16-23.

96892

Kim, S.H. & J.H. Lee

1999

32(1):16-23.

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Seasonal distribution of zooplankton was studied at seven selected stations in the lower part of the Han River during the period from June 1995 to June 1996 at two month intervals. Among 70 taxa of total zooplankton occurred, 60 taxa were identified to species, viz., three protozoans, 25 rotifers, 18 cladocerans, 13 copepods and one polycheat. In June 1995, a prosperity in species number was observed between 10~27 taxa through seven stations and became poor drastically just after a flood in July 1995. Spatially upper waters showed a prosperity in species number when compared with lower ones. Maximum abundance of 44,317 indiv./m 3 was recorded at station 7 in June 1996, while no zooplankters were observed at the same station in July 1995. Seasonal distribution showed the high abundance in June both in 1995 and 1996, and low abundance in July and January. Three cladoceran species (Daphnia galeata, D. pulex and Bosmina longirostris) and three copepod species (Canthocamptus carinatus, Cyclops vicinus and Thermocyclops hyalinus) dominanted zooplankton community with high abundance. Maximum population density of 16,964 indiv./m3 was recorded by the single species of D. galeata (station 2 in June 1996). D. pulex (9,375 indiv./ m3 ), B. longirostris (7,250 indiv./m3 ), T. hyalinus (6,714 indiv./m3 ) and C. vicinus (5,772 indiv./m3 ) also established dense populations, respectively. Spatial and temperal variation in the species diversity index indicated that the higher values of indices the upper stations except May and June 1996.

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