2014年春季东海现生颗石藻群落分布及环境影响

DISTRIBUTION PATTERN OF MODERN COCCOLITHOPHORES IN THE EAST CHINA SEA IN SPRING,2014 AND THEIR RESPONSES TO ENVIRONMENT

通过对2014年5月东海89个水样进行颗石藻扫描电子显微镜分析,得到本海域春季现生颗石藻群落组成及空间分布,并分析了环境因子对现生颗石藻分布的影响。结果表明:春季优势种为Emiliania huxleyi、Gephyrocapsa oceanica、Syracosphaeraspp.、Gephyrocapsa ericsoni等。现生颗石藻总量为0~356.40cells/mL,颗石片为0~2 062.38/mL。现生颗石藻多分布于0~50m水层中,颗石片在底层多有分布。无论在表层水体还是垂直水体中,现生颗石藻的分布均呈现近岸到外海、由西北到东南,丰度升高、多样性增多的趋势,这与东海复杂水团系统导致的温盐、营养盐等环境因子变化有关。

The community of coccolithophores in the East China Sea during the spring（18th May to 13 th June）of 2014 are studied in this research.The community composition and spatial distribution of living coccolithophores（LCs）in the survey area are revealed and the influence of environmental factors discussed.89 plankton samples are analyzed by scanning electronic microscope with Emiliania huxleyi,Gephyrocapsa oceanica,Syracosphaera spp.,Gephyrocapsa ericsoni as dominant species.The cell abundance of coccolithophores ranges in 0~356.40cells/mL and the abundance of coccoliths is in the range of 0~2 062.38/mL.LCs are mainly distributed in 0to 50 m water depth.Coccoliths increase rapidly in the deepest water layer.No matter in surface water or vertical water,the LCs cell abundance and diversity index demonstrate a rising tendency both from costal to ocean and from northwest to southeast.Temperature,salt and nutrient concentrations are suggested as the major environmental factors controlling the distribution of LCs in the ECS.