[Changes in Phytoplankton Community Structure in Qingcaosha Reservoir Based on Time Series Analysis].

Q2 Environmental Science Huanjing Kexue/Environmental Science Pub Date : 2024-10-08 DOI:10.13227/j.hjkx.202310038
Xin-Lan Wang, Yin Guo, Feng Li, Wen-Ting Wang, Li-Ya Sheng, Li-Jing Chen
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Abstract

Qingcaosha Reservoir is one among the important reservoirs and drinking water sources in Shanghai. Samples were collected from the reservoir every month from 2014 to 2021 to analyze phytoplankton community structure and water environmental factors to provide a reasonable reference for urban reservoir operation management, water resource protection, and development and utilization. The results showed that 561 species of phytoplankton were identified from eight phyla in 8a, mainly diatomata, chlorophyta, and cyanophyta, accounting for 34.94%, 34.58%, and 17.65% of the total species, respectively. A total of 26 dominant species were present in four phyla, and cyanobacteria accounted for 50%. Diatoms and green algae were the dominant species, cyanobacteria was the absolute dominant species, and other phyla accounted for a low proportion in the community structure. The Qingcaosha reservoir had the tendency of transforming into a cyanobacteria-type reservoir. The major dominant genera of chlorophyta were Scenedesmus, Ankistrodesmusc, and Chlorellaceae. The dominant genera of the phylum cyanobacteria were Merismopediaceae, Microcystaceae, Aphanocapsa, and Pseudanabaenaceae. The major dominant genera of the diatoms were Cyclotella, Melosira, and Aulacoseira. The dominant genus of xanthophyta was Tribonemataceae. Phytoplankton abundance ranged from 8.391×105 to 2.115×107 cells·L-1, with an average of 6.345×106 cells·L-1. The biomass of phytoplankton varied from 0.113 to 11.903 mg·L-1, with an average of 1.538 mg·L-1. The maximum abundance occurred in summer, and the maximum biomass occurred in spring. In spatial distribution, the maximum biomass and abundance appeared in the reservoir. Redundancy analysis (RDA) of phytoplankton community structure and water environmental factors showed that water temperature (WT), dissolved oxygen (DO), and nutrient salts (TN, TP) were important environmental factors affecting phytoplankton community structure, and significant changes occurred in 2014-2017 and 2018-2021. From 2018 to 2021, cyanobacteria disappeared and cyanobacteria dominated the reservoir and even changed to cyanobacteria-type reservoirs. From 2016 to 2021, half of the dominant species were cyanobacteria, and the cyanobacteria abundance accounted for the highest proportion during this period. The reasons for the extinction of xanthophyta were speculated to be the increase in phosphorus concentration and water temperature, and the reasons for the dominant position of cyanophyta, to be the rise of water level, water temperature, and alkaline water. Reservoirs use filter-feeding fish to control algal overgrowth; however, filter-feeding fish do not filter all algae and not all of their filter-feeding algae is easily digestible. In this study, it was observed that the size of digestible algae biomass in the four seasons was in the order of spring > summer > autumn > winter. RDA analysis of silver carp, bighead carp, and digestible algae showed that the biomass of digestible algae was positively correlated with that of silver carp and bighead carp in spring, autumn, and winter. These results suggest that the digestibility of algae changed the resource use efficiency of filter-feeding fish and led to changes in phytoplankton community structure. The phytoplankton community structure was directly affected by the descending effect of fish and indirectly affected by the digestibility of algae.

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[基于时间序列分析的青草沙水库浮游植物群落结构变化]。
青草沙水库是上海市重要的水库和饮用水源之一。从2014年至2021年,每月从水库采集样品,分析浮游植物群落结构和水环境因子,为城市水库运行管理、水资源保护和开发利用提供合理参考。结果表明,在8a中发现了8个门类的561种浮游植物,主要为硅藻门、叶绿体门和蓝藻门,分别占总种数的34.94%、34.58%和17.65%。4 个门类共有 26 个优势种,其中蓝藻占 50%。硅藻和绿藻为优势种,蓝藻为绝对优势种,其他门类在群落结构中所占比例较低。青草沙水库有向蓝藻型水库转变的趋势。叶绿体的主要优势种属为 Scenedesmus、Ankistrodesmusc 和 Chlorellaceae。蓝藻门的主要优势种属是 Merismopediaceae、Microcystaceae、Aphanocapsa 和 Pseudanabaenaceae。硅藻的主要优势种属是旋藻属、 Melosira 和 Aulacoseira。主要的黄藻属是三尖杉科(Tribonemataceae)。浮游植物丰度范围为 8.391×105 至 2.115×107 cells-L-1,平均为 6.345×106 cells-L-1。浮游植物生物量在 0.113 至 11.903 mg-L-1 之间变化,平均为 1.538 mg-L-1。最大丰度出现在夏季,最大生物量出现在春季。在空间分布上,最大生物量和丰度出现在水库。浮游植物群落的冗余分析(RDA)表明,水温(WT)、溶解氧(DO)和营养盐(TN、TP)是影响浮游植物群落结构的重要环境因子。是影响浮游植物群落结构的重要环境因子,并在 2014-2017 年和 2018-2021 年发生了显著变化。从 2018 年到 2021 年,蓝藻消失,蓝藻在水库中占主导地位,甚至变为蓝藻型水库。2016-2021 年,优势种的一半为蓝藻,这一时期蓝藻丰度占比最高。据推测,黄藻灭绝的原因是磷浓度和水温升高,蓝藻占优势的原因是水位上升、水温升高和水质偏碱。水库利用滤食性鱼类来控制藻类的过度生长;然而,滤食性鱼类并不能过滤所有的藻类,其滤食性藻类也并非都易于消化。本研究观察到,四季中可消化藻类生物量的大小依次为春、夏、秋、冬。对鲢鱼、鳙鱼和可消化藻类的RDA分析表明,在春季、秋季和冬季,可消化藻类的生物量与鲢鱼和鳙鱼的生物量呈正相关。这些结果表明,藻类的可消化性改变了滤食性鱼类的资源利用效率,并导致浮游植物群落结构的变化。浮游植物群落结构直接受鱼类下降效应的影响,间接受藻类消化率的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Huanjing Kexue/Environmental Science
Huanjing Kexue/Environmental Science Environmental Science-Environmental Science (all)
CiteScore
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