Aquatic Sciences Meeting, Albuquerque 2001

PC01 Harmful Algal Blooms

Date: Tuesday, February 13, 2001

Location: Southwest Hall

Yih, W, , Kunsan National University, Kunsan, Republic Of Korea, ywonho@kunsan.ac.kr

Jeong, H, J, Kunsan National University, Kunsan, Republic Of Korea,

Park, J, K, Inje University, Kimhae, Republic Of Korea,

Shim, J, H, Seoul National University, Seoul, Republic Of Korea,

Lee, K, H, Kunsan National University, Kunsan, Republic Of Korea,

THE OUTBREAK OF RED TIDES IN THE COASTAL WATERS OFF KOHUNG, KOREA. 1. THE TEMPORAL AND SPATIAL VARIATIONS IN THE PHYTOPLANKTONIC COMMUNITY IN 1997

We investigated the phytoplankton community from June to September 1997 off Kohung where red tides have frequently occurred. We took water samples five times from 5 depths at 6 or less stations. A huge red tide dominated by Gyrodinium impudicum outbroke on August 24. On August 21 the abundance of G. impudicum at the inner bay station (IBS) was higher than that at the outer bay station (OBS). However, on August 27 its abundance at IBS did not increase, whereas that at OBS increased rapidly and reached to the maximum of 30,000 cells/ml. Instead, diatoms (Skeletonema, Chaetoceros, Pseudonitzschia) rapidly increased at IBS where fresh water from lands has reached. The high abundance of diatoms might have inhibited the growth of red tide dinoflagellates at IBS. The aggregation of scattered cells driven by physical forces and/or competition between diatom and dinoflagellates might be responsible for this appearance of dense red tide patches at OBS.

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Aquatic Sciences Meeting, Albuquerque 2001

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