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首页> 外文期刊>Estuarine Coastal and Shelf Science >Short-term variations of phytoplankton communities in response to anthropogenic stressors in a highly altered temperate estuary
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Short-term variations of phytoplankton communities in response to anthropogenic stressors in a highly altered temperate estuary

机译：在高度变化的温带河口，浮游植物群落对人为压力的响应的短期变化

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Data for phytoplankton size classes, taxonomy, and water properties were collected through an episodic freshwater discharge event (4 days) in the temperate Youngsan River estuary, which is highly disturbed by manually regulated inputs of freshwater from a sea dike, to investigate the effects of an acute change in anthropogenic stressors on the short-term dynamics of phytoplankton and their surrounding environments. The salinity of the well-mixed saline water (33.2-33.5) decreased to as low as 4.0 and water temperature increased to 24.0 C during the freshwater discharge, resulting in a stratified water column in the upper region of the estuary. During the discharge, chlorophyll a (chi a) concentrations increased to as much as 15.66n L-1 with micro-sized phytoplankton being dominant due to the presence of microsized freshwater phytoplankton, mostly Aulacoseira ambigua (98% in cell abundance), transported from the reservoir. Primary production decreased to as little as 87.9 mg C m(-2) d(-1), although nutrients such as NO2- + NO3- were supplied by the freshwater inputs of the discharge. Following the discharge, dinoflagellate blooms, dominated by Heterocapsa sp. (>88%), a nano-sized red tide species, developed in the upper regions of the estuary with peaks in chi a concentrations reaching as high as 30.33 mu g L-1. Another red tide species, Prorocentrum micans, was also dominant in the estuary, suggesting that harmful algal blooms (HABs) are associated with anthropogenic stressors related to the freshwater inputs. The Shannon diversity index decreased to 0.18 while the Simpson dominance index increased to 0.94 during the discharge, but the diversity increased again following the discharge. The phytoplankton communities and diversity changed along the salinity gradient, corresponding to an "ecocline" pattern. The results of multivariate statistical analysis suggested that phytoplankton species and size structure were controlled mainly by salinity, water temperature, turbidity, and PO43-, which were affected by the regulated freshwater discharge. This study indicates that rapid changes in anthropogenic stressors related to the operation of an engineered structure may impact the eutrophication and biotic integrity of an estuarine system by generating short-term variations in phytoplankton biomass, size, and species composition, especially of harmful algae. (C) 2014 Elsevier Ltd. All rights reserved.
机译：浮游植物大小等级，分类学和水性质的数据是通过在温带的扬山河河口发生的偶发淡水排放事件（4天）收集的，该事件受到人工调节的海堤淡水输入的严重干扰，以调查浮游生物的影响。人为压力源对浮游植物及其周围环境短期动态的急剧变化。在淡水排放期间，充分混合的盐水的盐度（33.2-33.5）降低至4.0，水温升至24.0 C，在河口上部形成分层的水柱。在排放过程中，叶绿素a（chi a）浓度增加至高达15.66n L-1，其中微小尺寸的浮游植物占主导地位，这是由于存在微小尺寸的淡水浮游植物，主要​​是淡水浮游生物（占98％）。水库。初级生产减少到87.9 mg C m（-2）d（-1），尽管排放的淡水输入提供了诸如NO2- + NO3-的养分。放电后，鞭毛藻大量繁殖，由杂种藻占主导。 （> 88％）是一种纳米大小的赤潮物种，在河口的上部形成，其最高峰浓度高达30.33μg L-1。在河口，另一种赤潮物种-原球藻也占主导地位，这表明有害的藻华（HAB）与与淡水输入有关的人为压力有关。在放电过程中，香农多样性指数降低到0.18，而辛普森优势指数增加到0.94，但是放电后多样性再次增加。浮游植物群落和多样性沿盐度梯度变化，对应于“ ecocline”模式。多元统计分析结果表明，浮游植物的种类和大小结构主要受盐度，水温，浊度和PO43-的控制，并受淡水排放量的调节。这项研究表明，与人为设计的结构相关的人为应激源的快速变化可能通过产生浮游植物生物量，大小和物种组成（尤其是有害藻类）的短期变化来影响河口系统的富营养化和生物完整性。 （C）2014 Elsevier Ltd.保留所有权利。

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