ScienceAsia 32 Supplement 1 (2006): 051-056 |doi: 10.2306/scienceasia1513-1874.2006.32(s1).051

Variation of Harmful Algal Blooms in Masan-Chinhae Bay

Changkyu Lee^* and Wolae Limand

 
ABSTRACT: The temporal variation of algal blooms and species succession were reviewed for Masan-Chinhae Bay since 1981. Thirty-two planktonic species of which 14 species were dinoflagellates and one was a protozoan were identified as the causative organisms responsible for the blooms in Masan-Chinhae Bay. Based on frequency and abundance, more than 90 % of algal blooms occurred from April to September. Spring blooms dominated by either the diatom, Skeletonema costatum or the dinoflagellate, Heterocapsa triquetra, and Alexandrium spp. and the euglenoid, Eutreptiella gymnastica were replaced by Heterosigma akashiwo, Prorocentrum spp., Cochlodinium polykrikoides and Akashiwo sanguinea. Following the blooms by these aestival flagellates, diatoms such as Skeletonema costatum and Thalassiosira spp. became predominant in autumn. Water temperature and salinity played a significant role in the species succession. A continuous supply of organic and inorganic nutrients from the stream waters caused by heavy rainfall gave rise to persistent algal blooms during the summer season.

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National Fisheries Research and Development Institute, 408-1 Gijang-up, Gijang-gun, Busan, 619-902, Korea.

* Corresponding author, E-mail: cklee@nfrdi.re.kr