Seasonal variations in cell abundance of Noctiluca scintillans in the coastal waters off Chonburi Province, the upper Gulf of Thailand

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Seasonal variations in cell abundance of Noctiluca scintillans was studied from June 2003 to November 2004 in the coastal waters off Chonburi Province, the upper gulf of Thailand. Eight stations from Bangpakong River mouth to Angsila were designed to cover the area where red tides often occurred and were under the influence of Bangpakong River. Numerical abundance was analyzed in relation with some environmental parameters. A total of 9 N. scintillans red tides, 7 Ceratium furca red tides and 4 diatom red tides were found in this study. Noctiluca and Ceratium red tides were often found when salinity was in the range of 22 to 33psu. and 12 to 27psu., respectively. Those red tides were not associated with apparent negative effects to marine animals. N. scintillans cells could be observed almost all year round at offshore stations where the water depth was more than 10 meters except strong wind periods, suggesting that Noctiluca in coastal waters were supplied by cells from offshore stations. In contrast, no consistent pattern was observed in the distribution of N. scintillans in coastal waters, in particular near the river mouth. Only the relationship between phosphate concentrations and cell densities of Noctiluca has been found statistically significant. However, the high cell densities of both Noctiluca and Ceratium were often observed in the rainy season, especially on the calm day after heavy rain. These observations suggested that the red tides of those two species in coastal waters were growth response to the influence of freshwater run off from Bangpakong River.
2006-04-28

Seasonal variations in cell abundance of Noctiluca scintillans in the coastal waters off Chonburi Province, the upper Gulf of Thailand

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