Aquatic Sciences Meeting, Albuquerque 2001

CS40 Nutrients, Primary Production, and Aquatic Ecosystems

Date: Wednesday, February 14, 2001, Time: 4:30:00 PM

Location: La Cienega

Leee, H, Y, Chonnam National University, Kwangju, Republic Of Korea, haklee@chonnam.ac.kr

Cho, I, S, Institute of Kumho Life and Environment, Kwangju, Republic Of Korea, ischo65@hanmail.net

PHYTOPLANKTON ABUNDANCE AND COMMUNITY STRUCTURE IN RELATION TO THE TYPHOON

Phytoplankton abundance and community structure were studied in relation to physical processes of water column by a typhoon in a branch of Lake Chuam, Korea. Physical processes by the typhoon (Prapiroon; 12th typhoon of 2000), with maximum wind speed up to 40m/sec, were great enough to cause the broke down of the thermal stratification, and resulted in temporal mixing of bottom waters with surface waters. During the mixing period of surface and bottom waters, phytoplankton crop levels decreased slightly and the compositions of the species changed completely. The thermal stratification re-established after 3 days of the typhoon and phytoplankton crop levels increased more than the levels of prior to the typhoon. The community structure of phytoplankton also shifted during the process of restratification. Diatoms were the most diverse and abundant group before the typhoon. Two days after the typhoon, during the mixing period, chlorophycean group appeared, and became the most diverse group after re-establishment of thermal stratification. The chlorophycean dominance was replaced by cyanophycean dominance (especially Microcystis aeruginosa) after the decline of surface water temperature.

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Aquatic Sciences Meeting, Albuquerque 2001

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