Algae. 2004; 19(3): 227-234.
Dynamics of Phytoplankton Community and the Physico-chemical Environmental Factors in Youngchun Dam
ook Chan Kim* and Han Soon Kim1
Institute of Public Health & Environment, Kyungsangbook Do, Taegu 702-702 and 1Department of Biology, Kyungpook National University, Taegu 702-701, Korea
A study on the dynamics of phytoplankton community and the physico-chemical environmental factors was performed biweekly from April 1998 to March 1999 in Youngchun Dam. A total 72 phytoplankton taxa was identified and dominant taxa were blue-green algae and diatoms. The highest value of phytoplankton standing crop (24,826cells·ml) was observed in September 7, 1998, the blooming period of blue-green algae Phormidium sp., while the lowest (318cells·ml) was measured in June 18, 1999. The phytoplankton communities were dominated by blue-green algae of Anabaena planktonica, Microcystis aeruginosa and Phormidium sp. during the summer and autumn periods and were dominated by diatoms of Synedra acus and Aulacoseira spp. during the spring and winter periods. Secchi disc transparency, chlorophyll-a, total nitrogen, total phosphorus and silicate concentration were varied in the ranges of 0.4-2.5 m, 2.4-32.2mg·m, 0.845-2.352mg·l, 0.005-0.093mg·l, 0.2-15.7mg·l, respectively. The trophic status of Youngchun Dam were estimated eutrophic according to Lake Trophic States Index (LTSI).
Keywords : Lake Trophic Status Index(LTSI); phytoplankton community; standing crop; Youngchun Dam