Studies On The Characteristics Of Morphology And Distribution Of Red-tide Dinoflagellate Cysts In China

Spatial distribution of species and abundance of red-tide Dinoflagellate cysts in China Sea was studied in present paper, on the basis of surveys of surface sediments from 33 bays in Bohai Sea, Yellow Sea, East Sea and South China Sea, as well as from publicated papers. Studies on the temporal and spatial distribution of cysts in Changshan Archipelago were also conducted, to interpreate the relationship of community and distribution of cysts with environmental factors. The results were as follows:Interpretation were conducted on the spatial distribution of 40 common or representative species, included Gonyaulacales 4 familiers 5 genus and 12 species; Gymnodiniales 3 familiers 5 genus and 7 species; Peridiniales 3 familiers 6 genus and 21 species. And the dinoflagellate cysts belong to 6 group include Gonyaulacoid group, 11; Tuberculodinioid,1; Calcoidinellid group,3; Gymnodinioid group,6; Protoperidinioid group,16 and Diplopsalid group,3, which were favor to further researches on the monitor of shell toxin and red tide. The number of species and abundance of Dinoflagellate cysts were low in Bohai Sea, with high number of species and low abundance in East Sea. While cyst exhibited high number of species and abundance in parts of Yellow Sea and South China Sea, suggesting that there were risk of outbreak of red tide of Dinoflagellate in these sea area. Analysis of similarity coefficients among communities of Dinoflagellate cysts from 9 representative sea area displayed that the tested community were no more than median similarity level, showing obvious variation of the community constitution among above sea area, which suggested that the relationship of the tested community of cysts were far. Rich species and high abundance of Dinoflagellate cysts were exhibited in Changshan Archipelago, representing another concentralized area in China Sea except for Daya Bay and Shenzhen Bay. Abundant cysts concentrated on the culture zone located in the Island shadow region, due to the special sedimental enviroment caused by island effect, which may contribute to the shellfish toxins.