1990 red tide at Banban Bay, Zambales, Philippines: variations in Pyrodinium bahamense cells
1993
Corrales, R.A. | Quimpang, V.T. (Philippines Univ., Diliman, Quezon City (Philippines). Marine Science Inst.)
Pyrodinium bahamense (var. compressum) has been identified as the organism causing red tides and paralytic shellfish poisoning (PSP) in many coastal waters in the Philippines since 1983. This toxic variety has also been named as the causative organism of red tides in other areas of the Indo-west Pacific while the non-toxic variety (bahamense) has been reported only from the Atlantic. Light and scanning electron microscopic analysis of fresh and preserved plankton samples from the 1990 (April to July) bloom in Banban Bay, Masinloc, Zambales, Philippines revealed variations in cell size and structure of P. bahamense representatives. Results suggest 1) both the non-toxic bahamense and the toxic compressum could have been present in the site during the bloom, or 2) the variations are individual differences within the toxic (var. compressum) population. Present findings should be verified particularly by isolating and culturing the representatives of both the bahamense-types and the compressum types to gather also information on their physiology and test their toxicity
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