Samples of phytoplankton groups Benthic Dinoflagellate. The samples were collected in the water with Screen sampling method and sampling of what the island include natural track algae and sponges. Reef In Chonburi four times, including Koh Rin two times (January and June 2557) found phytoplankton groups Benthic Dinoflagellate 2 species Prorocentrum sp. And Ostreopsis sp. By Prorocentrum sp. Was found in density, mass and 32.7 ± 18.6 cells /. m2, algae, 7.15 ± 0.0 cells / kg. Sponge vase 10.76 ± 25.13 cells / kg. The Ostreopsis sp. was found in density, mass and 272.3 ± 306.5 cells / m2, algae 96.57 ± 136.57 cells / kg. Sponge vase 13.61 ± 16.12 cells. / kg. island dish sampling two times (in December 2557 and May 2558) found phytoplankton groups Benthic Dinoflagellate 3 species Prorocentrum sp., Ostreopsis sp. and Gambierdiscus sp. by Prorocentrum sp. found the density of the water. 36.29 ± 0.63 cells / m2 and algae 0 - 0.89 cells / kg. The Ostreopsis sp. was found in the mass density of water. 12,512.55 ± 276.14 cells / m2 and algae 0-3.91 cells / kg. And Gambierdiscus sp. Was found in the water density 41.69 ± 0.91 cells / m2 and algae 0-1.98 cells / kg. The results of this study were found in mass. Water phytoplankton groups Benthic Dinoflagellate. Higher density algae and sponges.
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