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首页> 外文期刊>Estuarine Coastal and Shelf Science >Nutrient stoichiometry and freshwater flow in shaping of phytoplankton population in a tropical monsoonal estuary (Kundalika Estuary)
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Nutrient stoichiometry and freshwater flow in shaping of phytoplankton population in a tropical monsoonal estuary (Kundalika Estuary)

机译：热带季风河口（昆达利卡河口）浮游植物种群形成过程中的营养化学计量和淡水流量

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摘要

The present study aimed to understand the role of freshwater flow and physico-chemical parameters in influencing the phytoplankton community shift and thereby helping in balancing the ecosystem. The Kundalika estuary (ME) is a semi-diurnal tropical monsoonal estuary. Strong upstream currents during monsoon as assessed through a 2D numerical model influenced the succession of marine, estuarine and freshwater phytoplankton species depending on the extent of freshwater influx and its distribution in the estuary. Nitrogen and phosphorus played a pivotal role in regulating the phytoplankton growth and their proliferation. Distribution of different phytoplankton species in accordance to salinity and nutrient content was clearly observed. Among the four major classes (Diatoms, Dinoflagellates, Chlorophytes and Phytoflagellates) occurring in the ME, diatoms occupied a wide salinity range. Large-scale shifts in phytoplankton biomass and composition were associated with river run-off during monsoon. Phytoflagellates and Chlorophytes restricted their abundance to relatively high nitrogen level zones. Canonical Correspondence Analysis (CCA) between environmental variables and dominant taxa of phytoplankton indicated the influence of salinity on phytoplankton distribution in the estuarine precinct. Thus the freshwater influx in the KE played a major role on phytoplankton species diversity and its bloom potential. (C) 2017 Published by Elsevier Ltd.
机译：本研究旨在了解淡水流量和理化参数在影响浮游植物群落迁移中的作用，从而帮助平衡生态系统。昆达利卡河口（ME）是半日热带季风河口。通过二维数值模型评估的季风期间强大的上游水流影响了海洋，河口和淡水浮游植物的演替，这取决于淡水的涌入程度及其在河口的分布。氮和磷在调节浮游植物的生长及其增殖中起着关键作用。清楚地观察到了根据盐度和养分含量不同的浮游植物种类的分布。在ME中出现的四个主要类别（硅藻，鞭毛藻，叶绿藻和植物鞭毛藻）中，硅藻占据了很大的盐度范围。季风期间浮游植物生物量和组成的大规模变化与河流径流有关。鞭毛藻和叶绿藻将其丰度限制在较高氮水平的区域。环境变量与浮游植物的优势类群之间的典型对应分析（CCA）表明，盐度对河口区浮游植物分布的影响。因此，KE中的淡水涌入对浮游植物的物种多样性及其开花潜力起着重要作用。 （C）2017由Elsevier Ltd.发布

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