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首页> 外文期刊>Acta Oceanologica Sinica >Dynamics of picoplankton in the Nansha Islands area of the South China Sea
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Dynamics of picoplankton in the Nansha Islands area of the South China Sea

机译：南海南沙群岛地区浮游鱼类的动态

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摘要

Dynamics of major picoplankton groups, Synechococcus (Syn), Prochlorococcus (Pro), picoeukaryotes (Euk) and heterotrophic bacteria (Bact) was investigated by flow cytometry for the first time in the Nansha Islands area in the South China Sea. Averaged over the whole investigation area, depth-weighted integrated cell abundance (DWA) of Syn, Pro, Euk and Bact was 1.6 (0.4～5.7)x10~3, 5.4 (0.1～7.3)x10~4, 0.7 (0.2～2.2)x10~3, and 2.3 (1.4～3.2)10~5 cells/mL respectively. Picoautotrophic cell abundance was low in the northwest part of the Nansha Islands where surface water temperature was low and the upper mixed layer was shallow. Concurrently, a surface maximum vertical distribution pattern was observed in this area. While in the southeast and east zones where temperatures were relatively higher and nitraclines were deeper, picoplankton is abundant and a subsurface maximum around 50～75 m is observed. Coupling of horizontal and vertical distribution patterns of picoplankton abundance and hydrological status was found, suggesting a strong influence of currents and water column structure on picoplankton distribution in the investigation area. Contrary to that in the shelf water in the East China Sea, the relationship between Pro and Bact in the Nansha Islands area in the South China Sea was not significantly negative but weakly positive. Moreover, a similar distribution pattern of Syn and Pro was observed. Possible reasons for these differences in the two marine regimes were discussed.
机译：通过流式细胞术首次在南海南沙群岛地区对主要的微微浮游生物群，Synechococcus（Syn），Prochlorococcus（Pro），picoeukaryotes（Euk）和异养细菌（Bact）进行了动力学研究。在整个调查区域平均，Syn，Pro，Euk和Bact的深度加权综合细胞丰度（DWA）为1.6（0.4〜5.7）x10〜3、5.4（0.1〜7.3）x10〜4、0.7（0.2〜2.2） ）x10〜3和2.3（1.4〜3.2）10〜5细胞/ mL。南沙群岛西北部的微自养细胞丰度低，那里的地表水温度低，上层混合层较浅。同时，在该区域观察到表面最大垂直分布图案。而在东南和东部地区，温度相对较高，而硝酸盐则较深，而微微浮游生物丰富，并且在50〜75 m处发现了地下​​最大值。研究发现了浮游生物丰度水平和垂直分布格局与水文状况的耦合，这表明洋流和水柱结构对研究区的浮游生物分布产生了强烈影响。与东海的陆架水相反，南海南沙群岛地区的Pro和Bact之间的关系不是显着的负相关，而是弱的正相关。此外，观察到相似的Syn和Pro分布模式。讨论了两种海洋制度中这些差异的可能原因。

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