The relative effects of upwelling and river flow on the phytoplankton diversity patterns in the ria of A Coruña (NW Spain).
The relative effects of upwelling and river flow on the phytoplankton diversity patterns in the ria of A Coruña (NW Spain).
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DOI：
10.1007/s00227-017-3126-9
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发表时间：
2017
期刊：
影响因子：
2.4
通讯作者：
Santos MD
中科院分区：
文献类型：
--
作者：
Bode A;Varela M;Prego R;Rozada F;Santos MD
河口浮游植物物种组合与河流和海洋环境中的浮游植物物种组合通过当地水动力学联系起来，从而导致类群的连续流动。这项研究揭示了上升流和河流对浮游植物群落的不同影响，该研究于2011年沿着一个盐度梯度进行观察，该盐度梯度来自通过拉科鲁尼亚（西班牙西北部，43° 16-21′ N，8° 16-22′ W）的里亚-海洋海湾系统与海洋相连的河流水库。与130浮游植物类群确定，组合占主导地位的一般硅藻，特别是丰富的海湾和河口，但也由绿藻和蓝藻在水库。从整个季节周期来看，当地的组合主要以隐藻和硅藻、小型甲藻和一些淡水绿藻的变化为特征。盐度、硝酸盐和有机质变量是影响浮游植物群落变化的主要环境因子，而磷酸盐和亚硝酸盐对河口和海湾的浮游植物群落也有重要影响。相应的本地浮游植物组合显示出中等水平的连接。河口社区共享一个变量数量的类群与邻近地区，取决于相对强度的上升流（主要影响海湾）和河流流量（主要影响水库），但平均有35%的独特类群。因此，当地和地带性多样性模式随季节变化，并不简单地与河流流量驱动的盐度梯度。本文的在线版本（doi：10.1007/s 00227 -017-3126-9）包含补充材料，可供授权用户使用。
Phytoplankton species assemblages in estuaries are connected to those in rivers and marine environments by local hydrodynamics leading to a continuous flow of taxa. This study revealed differential effects of upwelling and river flow on phytoplankton communities observed in 2011 along a salinity gradient from a river reservoir connected to the sea through a ria-marine bay system in A Coruña (NW Spain, 43° 16–21′ N, 8° 16–22′ W). With 130 phytoplankton taxa identified, the assemblages were dominated in general by diatoms, particularly abundant in the bay and in the estuary, but also by chlorophycea and cyanobacteria in the reservoir. Considering the entire seasonal cycle, the local assemblages were mainly characterized by changes in cryptophytes and diatoms, small dinoflagellates and some freshwater chlorophycea. Salinity, nitrate, and organic matter variables, were the main environmental factors related to the changes in the phytoplankton communities through the system, while phosphate and nitrite were also important for local communities in the estuary and the bay, respectively. The corresponding local phytoplankton assemblages showed moderate levels of connectivity. The estuarine community shared a variable number of taxa with the adjacent zones, depending on the relative strength of upwelling (major influence from the bay) and river flow (major influence of the reservoir) but had on average 35% of unique taxa. Consequently, local and zonal diversity patterns varied seasonally and were not simply related to the salinity gradient driven by the river flow. The online version of this article (doi:10.1007/s00227-017-3126-9) contains supplementary material, which is available to authorized users.