Thermal effects on the growth and fatty acid composition of four harmful algal bloom species: Possible implications for ichthyotoxicity

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• 作者：Bonggil Hyun ; Se-Jong Ju ; Ah-Ra Ko ; Keun-Hyung Choi…
• 关键词：Key wordsharmful algal bloom species (HABs) ; polyunsaturated fatty acids (PUFAs) ; growth rates ; cell volume ; toxicity
• 刊名：Ocean Science Journal
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：51
• 期：3
• 页码：333-342
• 全文大小：414 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Geosciences
  Oceanography
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  
• 出版者：Korean Ocean Research and Development Institute (KORDI) and the Korean Society of Oceanography, co-p
• ISSN：2005-7172
• 卷排序：51

文摘

Little is known regarding how harmful algal bloom species respond to different temperatures in terms of fatty acid production. This study examined the effects of temperature on the growth rates, cell volumes, and fatty acid concentrations and compositions of four harmful algal bloom species (HABs), Akashiwo sanguinea, Alexandrium tamarense, Chattonella ovata, and Prorocentrum minimum. The HABs species were cultured at 15, 20, 25, and 30°C in a nutrient-enriched medium. Three of the species maintained optimal growth rates over a wide range of temperatures, but A. tamarense did not. The cell volumes of each species showed little change over the temperature range. The total fatty acid concentrations in A. sanguinea, A. tamarense and C. ovata decreased as the temperature increased, but P. minimum showed no trend in this respect. Polyunsaturated fatty acids (PUFAs), the key biochemical components that maintain cell membrane fluidity and which are associated with toxicity, decreased in both concentration and proportion of total fatty acids as temperature increased, except in A. sanguinea, in which the proportion of PUFAs to the total fatty acids increased. These reductions in PUFA concentration and proportion could reduce cell membrane fluidity and toxicity in HABs; however, enhanced growth and/or ruptured cells, which are considered more toxic than intact cells, could compensate for the reduced per-cell toxicity. This phenomenon might impact on the marine ecosystem and aquaculture industry.