[蓝藻华期间优势种演替模式、后果及其影响因素]。

Tian Ouyang, Lu Zhao, Lu-Lu Ji, Song-Qi Yang, Bao-Hai Zheng, Yu-Xin Du, Jia-Xin Li, Yu-Xin Li, Jun-Qiong Shi, Zhong-Xing Wu
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引用次数: 0

摘要

优势种的演替总是发生在蓝藻华期间,因为不同的蓝藻形成的蓝藻华有一定的条件;这导致更多的不确定和复杂的影响,在蓝藻华。然而,在蓝藻繁殖过程中,优势种的演替模式、后果及其驱动因素并没有得到足够的重视。本研究于2018年4 - 9月对重庆市饮用水源地南鹏水库浮游植物群落特征及水环境因子进行了监测分析。结果表明:①南鹏水库共鉴定出浮游植物108种,隶属于8门59属。其中,4门13种被鉴定为优势种,其中,raciborskii柱状精子藻的优势度指数最高,其次是Pseudoanabaena sp.②5月和7月的蓝藻以Pseudoanabaena和柱状精子藻最具优势,蓝藻密度最高,而Shannon-Weiner多样性和Pielou均匀度显著低于其他月份。③NMDS结果显示,柱spermopsis和Pseudoanabaena与周围浮游植物群落的相关系数分别为0.58和0.48。此外,VPA结果表明,47.51%的群落组成变异可由环境因子解释,而由筒形植物和伪水藻解释的群落组成变异分别仅占12.04%和12.74%。④WT、pH和RUEN显著正影响筒形精子的丰度,SD和RUEP负影响筒形精子的丰度。然而,高锰酸盐指数显著正影响Pseudoanabaena丰度,EC和DO负影响Pseudoanabaena丰度。这些结果表明,这两种优势蓝藻对周围浮游植物群落都有显著影响。然而,相对于Pseudoanabaena,圆柱形精子对水生生态系统的影响更为明显。此外,限氮和水体变暖的协同效应可能导致了Pseudoanabaena被圆柱形精子藻取代,形成优势种群。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
[Succession Pattern and Consequences of the Dominant Species During Cyanobacterial Bloom and Its Influencing Factors].

The succession of dominant species always occurs during cyanobacterial blooms because there are certain conditions for cyanobacterial blooms formed by different cyanobacteria; this results in more uncertain and complex effects in cyanobacterial blooms. However, the succession pattern and consequences of dominant species and its driving factors have not received enough attention during cyanobacteria blooms. In this study, the phytoplankton community characteristics and water environment factors of Nanpeng Reservoir, a drinking water source in Chongqing, were monitored and analyzed from April to September 2018. The results showed that:① a total of 108 species of phytoplankton belonging to 59 genera and 8 phyla were identified in Nanpeng Reservoir. Of this, 13 species of 4 phyla were identified as dominant species, among which the dominance index of Cylindrospermopsis raciborskii was the highest, followed by that of Pseudoanabaena sp. ② The most dominant cyanobacteria were Pseudoanabaena and Cylindrospermopsis in May and July, respectively, in which cyanobacteria density peaked, whereas the Shannon-Weiner diversity and Pielou evenness were significantly lower than those in the other months. ③ NMDS results showed that the correlation between Cylindrospermopsis or Pseudoanabaena and the ambient phytoplankton community was 0.58 and 0.48, respectively. Moreover, the VPA results showed that 47.51% of the community variation could be explained by environmental factors, and only 12.04% and 12.74% of variation in community composition could be explained by Cylindrospermopsis and Pseudoanabaena, respectively. ④ The abundance of Cylindrospermopsis was significantly positively affected by WT, pH, and RUEN and negatively affected by SD and RUEP. However, the abundance of Pseudoanabaena was significantly positively affected by permanganate index and negatively affected by EC and DO. These results suggested that both dominating cyanobacteria had significant effects on the surrounding phytoplankton community. Relative to that of Pseudoanabaena, however, Cylindrospermopsis had a more obvious impact on the aquatic ecosystem. Moreover, the synergistic effect of N limitation and warming of the water column may have caused the replacement of Pseudoanabaena with Cylindrospermopsis to form a dominant population.

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