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Algae 2000;15(2): 99-110. |
| The Ecology of Phytoplankton in the Naktong Estuary
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| Ik Kyo Chung, Young Jak Kang, O-Seob Kwon, Jung Kwan Seo
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| ABSTRACT |
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The ecology of phytoplankton has been studied in the vicinity of Naktong Estuary in 1999. The temperature ranged between 7.7 and 25.3℃ and salinity varied from 3.89 to 33.62‰. The depth profiles of temperature and salinity have been significantly affected by the Naktong River barrage operations. The outflow of freshwater after the opening of barrage gate significantly influenced the water quality, the composition and biomass of phytoplankton community. The general pattern of phytoplankton community was similar to those found in the coast and embayment of Korea. The chlorophyll a biomass varied from 0.27μg·l supper(-1). The contribution of picoplankton was not important except in the winter and early spring season (up to 25.0%), and showed the year-round average of 6.8%. The nano-and microplankton showed 45.2% and 48.0% contribution. They showed the strong reverse relationship between the contribution of nano-and microplanakton in terms of chlorophyll a biomass. The changes in nanoplankton biomass showed significant positive correlations with temperature and negative correlations with salinity at St. 2. The patterns of changes in the cell counts were similar to those of chlorophyll a contents except in the winter and early spring. The spring bloom was dominated by several diatom species such as Aulacoseira granulata var. angustissima, Synedra acus and Chaetoceros sp. Ceratium fusus and C. furca was dominant only in summer season. Skeletonema costatum began to increase in late summer and became a dominant species in fall bloom with Chaetoceros sp
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