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首页> 外文期刊>Estuarine Coastal and Shelf Science >Picophytoplankton community in a tropical estuary: Detection of Prochlorococcus-like populations
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Picophytoplankton community in a tropical estuary: Detection of Prochlorococcus-like populations

机译：热带河口的浮游植物群落：类丙球菌种群的检测

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摘要

The influence of hydrography on the picophytoplankton (PP) abundance in estuaries was studied by sampling along a salinity gradient for the first time in an Indian estuary. Prochlorococcus-like cells were detected at salinities ranging from 0.06 to 35, which otherwise is reported from offshore regions, thereby showing that this group is capable of surviving in estuarine waters. PP also comprised picoeukaryotes and two groups of Synechococcus, one rich in phycoerythrin (SYN-PE) and other in phycocyanin (SYN-PC). Salinity played an important role in the picophytoplankton distribution. SYN-PE was represented by two sub-groups, one which was found only in saline waters (SYN-PEII) and the other throughout the salinity gradient (SYN-PEI). SYN-PEI and SYN-PC dominated downstream and upstream, respectively but were present throughout the salinity gradient unlike in other estuarine regions. Picoeukaryotes abundance showed an increasing trend from saline to brackish water and decreased in freshwater. The entry of seawater into the estuary regulated SYN-PE and Prochlorococcus-Wke cells downstream whereas their higher abundance in freshwater could be due to different strains of freshwater origin. The average contribution of PP to the total photosynthetic biomass during spring and neap tides was 43% and 29% respectively, which highlights the importance of PP in estuaries.
机译：通过在印度河口首次沿盐度梯度采样，研究了水文学对河口浮游植物（PP）丰度的影响。在盐度为0.06至35的范围内检测到了原球菌样细胞，否则从近海地区报道，从而表明该类细胞能够在河口水域中生存。 PP还包括皮核生物和两组Synechococcus，一组富含藻红蛋白（SYN-PE），另一组富含藻蓝蛋白（SYN-PC）。盐度在浮游植物的分布中起着重要作用。 SYN-PE由两个亚组代表，一个仅在盐水中发现（SYN-PEII），另一个在整个盐度梯度中都存在（SYN-PEI）。 SYN-PEI和SYN-PC分别在下游和上游占主导地位，但与其他河口区域不同，它们在整个盐度梯度中均存在。微型真核生物的丰度从盐水到微咸水呈增加趋势，而淡水则呈下降趋势。海水进入下游受河口调节的SYN-PE和Prochlorococcus-Wke细胞，而它们在淡水中的丰度较高可能是由于淡水来源的菌株不同。在春季和春季潮汐期间，PP对总光合生物量的平均贡献分别为43％和29％，这突显了PP在河口中的重要性。

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