Influence of seasonal variations in environmental parameters on fish assemblage and species diversity patterns was studied in a tropical reservoir of Central India during March 2021 to February 2022. A total of 41 species belonging to 7 orders, 15 families and 29 genera were recorded with highest diversity during post-monsoon season compared to the pre-monsoon season and monsoon season. The fish abundance similarity between the monsoon and post-monsoon reached a maximum of 89%. Seasonal variations in the mean species abundance, Simpson dominance index, Shannon diversity index, Pielou's evenness index and Margalef's richness index were determined. One-way ANOVA revealed a significant difference (P < 0.05) at the temporal scale. There was a significant seasonal difference in species abundance (P = 0.0006) and evenness index (P = 0.02) among the diversity indices. During the study period, three ‘vulnerable’ species, three ‘near threatened’ species and two ‘endangered’ species were caught. Carnivore dominance was evident throughout the year in the trophic guild of fishes. The Pearson correlation test revealed that water pH, dissolved oxygen, sediment organic carbon and clay percentage were positively correlated to all four diversity indices. Simpson and Margalef species richness diversity indices were positively correlated to sediment pH. Fish abundance was positively associated with sediment pH, silt, phosphorus and nitrogen content. Canonical correspondence analysis was used to investigate the relationships between fish assemblages and environmental conditions. Among the 19 physicochemical parameters, nine (dissolved oxygen, total dissolved solids, conductivity, transparency, hardness, phosphate and chlorophyll-a, sediment nitrogen and phosphorus) characteristics were shown to be statistically significant (P < 0.05) in determining fish diversity. Dissolved oxygen, total dissolved solids, conductivity, transparency, hardness, phosphate and chlorophyll-a of water and sediment nitrogen and phosphorus qualities were the key factors for the species abundance. The reservoir boasts a diverse fish population that allows multi-species fishing and generates revenue for numerous local fishers. Fish habitats should be protected in order to maintain diversity and long-term ecological benefits.

中文翻译：

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蒙格拉水库时间尺度上环境驱动因素对鱼类组合和多样性模式的影响：以印度中部马哈纳迪盆地支流之一为例

2021年3月至2022年2月，研究了印度中部热带水库环境参数季节变化对鱼类组合和物种多样性格局的影响。共记录到7目15科29属41种，多样性最高。季风后季节与季风前季节和季风季节相比。季风期和季风后鱼类丰度相似度最高达到89%。确定了平均物种丰度、辛普森优势指数、香农多样性指数、Pielou 均匀度指数和 Margalef 丰富度指数的季节变化。单向方差分析显示 时间尺度上存在显着差异（ P < 0.05）。 多样性指数中物种丰富度（ P  =0.0006）和均匀度指数（P =0.02）存在显着的季节差异。在研究期间，捕获了三种“脆弱”物种、三种“近危”物种和两种“濒危”物种。在营养性鱼类中，食肉动物的主导地位全年都很明显。Pearson相关性检验显示水体pH值、溶解氧、沉积物有机碳和粘土百分比与所有四个多样性指数均呈正相关。Simpson 和 Margalef 物种丰富度多样性指数与沉积物 pH 值呈正相关。鱼类丰度与沉积物 pH 值、淤泥、磷和氮含量呈正相关。典型对应分析用于研究鱼类组合与环境条件之间的关系。在19个理化参数中，9个（溶解氧、总溶解固体、电导率、透明度、硬度、磷酸盐和叶绿素-a、沉积物氮和磷）特征在确定鱼类多样性方面显示出统计学显着性（P < 0.05 ）  。水体和沉积物的溶解氧、总溶解固体、电导率、透明度、硬度、磷酸盐和叶绿素a以及沉积物的氮磷质量是物种丰度的关键因素。该水库拥有多样化的鱼类种群，可以进行多种鱼类捕捞，并为众多当地渔民带来收入。应保护鱼类栖息地，以保持多样性和长期生态效益。