Different aquatic organisms have different reactions to environmental variations due to their different ways of reaction traits. Understanding the effect of hydrological disturbance on lake from the perspective of multiple aquatic organisms is important for lake management. Poyang Lake (PYL) experiences severe hydrological disturbance under the effects of flood pulse during the rainy season. In this study, we analyzed the responses of phytoplankton, zooplankton, and macroinvertebrates to hydrological disturbance during the rainy season in PYL. Flood pulse determined the spatial variation in turbidity (Turb), transparency (Trans), dissolved oxygen (DO), total phosphorus (TP), and soluble reactive phosphorus. Physical factors (Turb, Trans, conductivity) explained phytoplankton (9.6%) and zooplankton (15%) community variation, and the combination of physical and nutrient factors explained macroinvertebrate (3.8%) community variation. Cyclotella sp., Attheya zachariasi, and Melosira ambigua were the keystone taxa of phytoplankton, and these taxa were driven by Turb and Trans. Brachionus angularia, Polyarthra vulgaris, Filinia longiseta, and Diffugia globulosa were the keystone taxa of zooplankton and entire aquatic organisms, which contributed a lot to maintain the biological community stability possibly through the food web. These keystone taxa were stimulated by high Trans, DO, dissolved organic carbon (DOC) and nitrate (NO₃⁻). We found habitat conditions (Turb, Trans and DO) were the prominent factors influencing the aquatic organism structure in strong hydrological disturbance environment. For the keystone taxa, both habitat conditions (i.e., DO) and exogenous nutrient inputs (i.e., DOC and NO₃⁻) caused significant effect. This study provides new insights into the holistic response of multiple aquatic communities to flood pulse as well as the role of keystone species in maintaining community stability, which could guide the conservation and management of seasonal lake ecosystems.

不同的水生生物因其不同的反应性状而对环境变化有不同的反应。从多种水生生物的角度了解水文扰动对湖泊的影响对于湖泊管理很重要。the阳湖（PYL）在雨季受到洪水脉冲的影响而遭受严重的水文干扰。在这项研究中，我们分析了PYL雨季期间浮游植物，浮游动物和大型无脊椎动物对水文干扰的响应。洪水脉冲确定了浊度（Turb），透明度（Trans），溶解氧（DO），总磷（TP）和可溶性反应性磷的空间变化。物理因素（涡轮，反渗透，电导率）解释了浮游植物（9.6％）和浮游动物（15％）的群落变化，Cyclotella sp。，Attheya zachariasi和Melosira ambigua是浮游植物的主要分类群，这些分类群是由Turb和Trans驱动的。臂状鞭毛虫，寻常型多虫，长发丝状lin虫和球状浮游杆菌是浮游动物和整个水生生物的基石分类群，它们可能通过食物网为维持生物群落的稳定做出了很大贡献。这些梯形类群是由高反式，DO，溶解的有机碳（DOC）和硝酸盐（NO的刺激₃ ^-）。我们发现在强水文扰动环境中，生境条件（Turb，Trans和DO）是影响水生生物结构的主要因素。对于梯形类群，无论生境条件（即，DO）和外源性养分输入（即，DOC和NO ₃ ^- ）引起的显著效果。这项研究提供了新的见解，以了解多个水生社区对洪灾脉动的整体反应以及基石物种在维持社区稳定中的作用，这可以指导季节性湖泊生态系统的保护和管理。