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Effects of Mississippi River water on phytoplankton growth and composition in the upper Barataria estuary, Louisiana
Hydrobiologia ( IF 2.6 ) Pub Date : 2020-03-03 , DOI: 10.1007/s10750-020-04214-0
Ling Ren , Nancy N. Rabalais , R. Eugene Turner

Diversion of river waters to adjacent estuaries may occur during wetland restoration, navigation channel development, or storms. We proposed that diversions of nitrogen- and phosphorus-enriched waters from the river to estuarine waters would result in increased phytoplankton biomass and shifts to noxious or harmful algal blooms. We tested this hypothesis by conducting four seasonal microcosm experiments in which Mississippi River water was mixed at different volume ratios with ambient estuarine waters of three lakes in the upper Barataria Basin, Louisiana, USA. These lakes included two brackish lakes that were in the path of diverted Mississippi River water, and a freshwater lake that was not. The results from the 3- to 8-day experiments yielded a predictable increase in phytoplankton biomass related to nutrient additions from Mississippi River water. The subsequent decreases in the dissolved nitrate + nitrite, soluble reactive phosphorus, and silicate concentrations explained 76 to 86% of the increase in chlorophyll a concentrations in the microcosms. Our experiments showed that cyanobacteria can successfully compete with diatoms for N and P resources even under non-limiting Si conditions and that toxic cyanobacteria densities can increase to bloom levels with increased Mississippi River water inputs to ambient waters in the microcosms. Diversions of Mississippi River into adjacent estuarine waters should be considered in relation to expected and, possibly, unexpected changes in phytoplankton communities to the receiving waters and coastal ecosystems.

中文翻译:

密西西比河水对路易斯安那州 Barataria 河口上游浮游植物生长和组成的影响

在湿地恢复、航道开发或风暴期间,河水可能会转移到邻近的河口。我们提出,将富含氮和磷的水域从河流转移到河口水域将导致浮游植物生物量增加,并转向有害或有害的藻华。我们通过进行四个季节性缩影实验来检验这一假设,其中密西西比河的水以不同的体积比与美国路易斯安那州巴拉塔里亚盆地上游三个湖泊的周围河口水混合。这些湖泊包括位于密西西比河分流路径上的两个咸水湖,以及一个不在分流路径上的淡水湖。3 到 8 天的实验结果表明,与来自密西西比河水的养分添加相关的浮游植物生物量的增加是可预测的。随后溶解的硝酸盐 + 亚硝酸盐、可溶性活性磷和硅酸盐浓度的降低解释了微观世界中叶绿素 a 浓度增加的 76% 到 86%。我们的实验表明,即使在非限制性 Si 条件下,蓝藻也可以成功地与硅藻竞争 N 和 P 资源,并且随着密西西比河向周围水域的水输入增加,有毒蓝藻密度可以增加到水华水平。应考虑将密西西比河改道至邻近的河口水域
更新日期:2020-03-03
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