Community Responses of Testate Amoebae (arcellinida and Euglyphida) to Ecological Disturbance Explained by Contrasting Assembly Mechanisms in Two Subtropical Reservoirs

Jean Claude Ndayishimiye,Pascaline Nyirabuhoro,Xiaofei Gao,Huihuang Chen,Wenping Wang,Yuri Mazei,Jun Yang

Science of the Total Environment（2024）SCI 2区SCI 1区

Cited 0|Views7

Abstract

Mechanisms underlying the effects of ecological disturbance on aquatic ecosystems remain uncertain in subtropical regions. Here, we used a proxy-based approach to explore the community dynamics of testate amoebae (Arcellinida and Euglyphida) in two subtropical deep reservoirs (Tingxi and Shidou) in Xiamen, southeastern China, over a three-year period. Specifically, we employed drought and typhoon events recorded by weather station as proxies for ecological disturbance and chlorophyll-a estimated through fluorometry as a proxy for testate amoeba food. We addressed three questions: (1) Does typhoon-induced ecological disturbance affect the distribution patterns of testate amoebae in subtropical reservoirs? (2) Do typhoon- and drought-induced ecological disturbances affect the testate amoeba community across different water layers of subtropical reservoirs similarly? (3) Do stochastic or deterministic processes shaping the testate amoeba community over time exhibit similar patterns in different water layers of subtropical reservoirs? The typhoon-induced ecological disturbance resulted in pronounced shifts in the distribution patterns of testate amoebae, characterized by lower shell influx in surface waters (11-12 ind. mL(-1) d(-1)) and higher shell influx in middle and bottom waters (12-22 ind. mL(-1) d(-1)). The impact of typhoon-and drought-induced ecological disturbance was more pronounced in surface waters, and its pure explanation accounted for 29.5-35.5 % community variation in a variation partitioning analysis. The effect of stochastic processes revealed by the neutral model increased with water depths, accounting for 63.3-76.5 % of the community variation in the surface, 77.4-82.6 % in the middle, and 82.8-88.1 % in the bottom water. The effect of deterministic processes shown by the null model decreased with water depth and remained relatively low across all water layers. These results suggest contrasting patterns of assembly mechanisms underlying the testate amoeba community responses to ecological disturbance, with the balance perhaps shaped by water depth and the average water residence time in a reservoir.

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Key words

Typhoon,Drought,Deep reservoir,Testate amoeba community,Stochastic processes,Deterministic processes

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【要点】：研究探讨了干旱和台风导致的生态干扰对两个亚热带水库中甲壳虫阿米巴（Arcellinida和Euglyphida）群落动态的影响，揭示了不同水层中群落组装机制的差异。

【方法】：通过使用干旱和台风事件作为生态干扰的代理指标，以及通过荧光测量法估计的叶绿素a作为食物资源的代理指标，研究了甲壳虫阿米巴群落的分布模式。

【实验】：研究在厦门的汀溪和石兜两个亚热带深水库进行了三年，发现台风导致的生态干扰显著改变了甲壳虫阿米巴的分布模式，表层水中壳体输入量降低（11-12 ind. mL(-1) d(-1)），而中层和底层水中壳体输入量增加（12-22 ind. mL(-1) d(-1)）。使用中性模型和零模型分析表明，表层、中层和底层水中随机过程对群落变化的影响逐渐增加，确定性过程的影响则逐渐降低。