Microcystin production during algal bloom occurrence in Laguna de Bay, the Philippines
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The amount of microcystin in Microcystis aeruginosa bloom was investigated during the rainy season of 1999 in Laguna de Bay, the Philippines. Bloom samples taken from the West Bay and East Cove stations of the lake were studied in relation to the characteristics of environmental conditions. Four types of microcystins, microcystin-LR (MC-LR), microcystin-RR (MC-RR), 6(Z)-Adda-microcystin-RR, and 3-desmethylmicrocystin-LR were identified from the natural bloom samples among which MC-LR was the most dominant type of microcystin. Production of microcystin (88.6 µg/100 mg dried cells) was highest during the first sampling week that coincided with high water transparency and high conductivity. The occurrence of a strong typhoon during the second sampling week had changed the environment drastically, which was characterized by low water transparency, high turbidity, low water temperature, and with trace amounts of MC-LR detected at the East Cove station. Thus, toxin production over time as well as the relationship between Microcystis production and toxin concentration could not be fully evaluated.
CitationBaldia, S. F., Conaco, M. C. G., Nishijima, T., Imanishi, S., & Harada, K.-I. (2003). Microcystin production during algal bloom occurrence in Laguna de Bay, the Philippines.
PublisherJapanese Society of Fisheries Science
Part of this study was conducted in Japan under a research fellowship grant by the Association of International Education, Japan (AIEJ). The senior author greatly acknowledges the AIEJ for the research fellowship. Our deep appreciation is also extended to Dr Lourdes J Cruz of the UP Marine Science Institute for her valuable comments and suggestions. Thanks are also due to Mr Rene Arcilla (BFS, SEAFDEC AQD) for his technical assistance to the study.
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