Effects of temperature on the germination of marine phytoflagellate cysts
2005
Shettapong Meksumpun(Kasetsart Univ., Bangkok (Thailand). Faculty of Fisheries. Dept. of Marine Science) | Charumas Meksumpun(Kasetsart Univ., Bangkok (Thailand). Faculty of Fisheries. Dept. of Fishery Biology) | Montani, Shigeru(Hokkaido University, Sapporo (Japan). Faculty of Fishery)
Effect of temperature on the germination of some phytoflagellate cysts was studied in two different temperature conditions, step-gradient temperature and constant temperature. The highest number of newly germinated cell of Scrippsiella spp., Alexandrium spp., Protoperidinium spp., Gyrodinium spp., Gymnodinium spp., and Diplopelta spp. Was observed after incubation 2 or 3 days when the initial temperatures were 13 and/or 19 deg C, but it took at least 5 days at the initial incubation temperature of 10 deg C. The germination rates of phytoflagellate cyst under optimum window should be faster than the other temperature ranges. The optimum temperature for cyst germination of Alexandrium spp., Protoperidinium pellucidum Bergh and Protoperidinum spp. Was considered to be at 16 deg C. For Scrippsiella spp., Gymnodinium spp. (small) and Gymnodinium spp., the optimum temperature for their cyst germination was considered to be 13 deg C, whereas that for Chattonella spp. could be as high as 25 deg C.
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