DISTRIBUTION PATTERN OF MODERN COCCOLITHOPHORES IN THE EAST CHINA SEA IN SPRING, 2014 AND THEIR RESPONSES TO ENVIRONMENT
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摘要:
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、Syracosphaera spp.、Gephyrocapsa ericsoni等。现生颗石藻总量为0~356.40 cells/mL，颗石片为0~2 062.38/mL。现生颗石藻多分布于0~50 m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。
Abstract:The community of coccolithophores in the East China Sea during the spring (18th May to 13th 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 0~356.40 cells/mL and the abundance of coccoliths is in the range of 0~2 062.38/mL. LCs are mainly distributed in 0 to 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.
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表 1 2014年春季东海现生颗石藻常见属种
Table 1. Common living coccolithophores of the East China Sea in spring 2014
属种 出现频率 优势度 (f/%) Y Emiliania huxleyi 62.921 0.304 043 Gephyrocapsa oceanica 56.180 0.146 316 Umbellosphaera tenuis 2.247 0.000 037 Helicosphaera carteri 3.371 0.000 110 Umbilicosphaera siboge 1.124 0.000 009 Calcidiscus leptoporus 4.494 0.000 294 Syracosphaera pulchra 25.843 0.022 647 Gephyrocapsa ericsoni 30.337 0.031 555 Calciosolenia murray 5.618 0.000 736 Syracosphaera spp* 11.236 0.003 589 Oolithotus fragilis 4.494 0.000 221 Calciosolenia brasiliensis 2.247 0.000 037 Calciosolenia caudatus 1.124 0.000 009 Florisphaera profunda 1.124 0.000 009 
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表 2 2014年春季东海颗石片常见属种
Table 2. Common coccoliths of the East China Sea in spring 2014
属种 出现频率 优势度 (f/%) Y Emiliania huxleyi 85.393 0.467 106 Gephyrocapsa oceanica 82.022 0.321 324 Umbellosphaera tenuis 14.607 0.000 264 Helicosphaera carteri 13.483 0.000 168 Umbilicosphaera siboge 26.966 0.001 356 Calcidiscus leptoporus 24.719 0.001 397 Syracosphaera rotula 1.124 0.000 005 Syracosphaera pulchra 53.933 0.017 246 Discophaera tubifera 1.124 0.000 001 Gephyrocapsa ericsoni 14.607 0.000 685 Calciosolenia murray 6.742 0.000 240 Syracosphaera spp* 13.483 0.000 747 Oolithotus fragilis 6.742 0.000 038 Calciosolenia brasiliensis 1.124 0.000 005 Calciosolenia caudatus 1.124 0.000 003 注：Syracosphaera spp*包括Syracosphaera pirus、Syracosphaera ampliora、Syracosphaera borealis、Syracosphaera nodosa
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