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首页> 外文期刊>Limnologica >Evaluation of aquatic ecological systems through dynamics of ichthyofaunal diversity in a Himalayan torrential river, Murti
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Evaluation of aquatic ecological systems through dynamics of ichthyofaunal diversity in a Himalayan torrential river, Murti

机译：通过在喜马拉雅洪水河，Murti的ICHThyofaunal多样性动态评估水生生态系统

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The biodiversity hotspot region of the Eastern Himalayas consists of a vast freshwater network enriched with species diversity. Many small-scale torrential rivers and water reaches contribute to the species pool of all the major rivers by converging downstream. These reaches are most likely to be degraded at a faster rate as compared to the large-scale rivers following an increased rate of urbanization, habitat alterations, and changing climatic conditions. Therefore, this study aims to explore River Murti, which is a representative small scale river system characterized by a large altitudinal gradient and a diverse watershed area. Ichthyofaunal diversity (i.e., diversity, evenness & richness) and 21 environmental variables are measured through a tri-seasonal sampling effort conducted along 14 selected locations. A total of 41 fish species (including species belonging to 4 Near Threatened, 8 Vulnerable, and 1 Endangered) are found inhabiting this river. Ichthyofaunal assemblage is found to be primarily modulated by habitat diversity and landscape variables. Three Aquatic Ecological Systems (AES) have been identified along this river in a top-down approach based on recorded environmental variables. We have calculated an observed/expected ratio for each diversity indices along 14 locations based on predicted temporal variability using boosted regression (BRT) models. The evaluation of diversity status has been kept at 0.5 to account for a 50% loss or deviation from observed (O/E50). This evaluation has been successfully used to delineate AES1 with majorly "Impaired" status and thus ensures its importance in terms of species conservation. Our study indicates the contribution of 11 major environmental drivers modulating the species assemblage patterns in these AES. Amongst them, altitude, substrate coarseness, river morphology, and shelter availability are strongly associated with species diversity as per the BRT models. These underlying factors are also correlated with "basin pressure," suggesting that anthropogenic disturbances, as well as the changing climate, might play an important role in the gradual change in environmental conditions, which in turn could cause a shift in species assemblage structure.
机译：大喜马拉雅山的生物多样性热点地区由富含物种多样性丰富的巨大淡水网络组成。许多小规模的暴颤河流和水达到所有主要河流的物种池通过在下游聚会。与城市化，栖息地改变率升高，栖息地改变和变化气候条件增加，这些达到最有可能以更快的速率降低。因此，本研究旨在探索Murti的河流，这是一个具有大型高度梯度和各种流域区域的代表性小型河流系统。通过沿14个选定地点进行的三季季节性采样努力来衡量ICHTHYOFAUNAL多样性（即多样性，均匀性和丰富度）和21个环境变量。共有41种鱼类（包括属于威胁的4种威胁，8个脆弱的物种，8个弱势和1个濒危）被发现居住在这条河上。发现ICHTHYOFAALALAL汇编主要由栖息地多样性和景观变量调制。基于记录的环境变量的自上而下的方法，已经沿着这条河流识别了三种水生生态系统（AES）。根据预测的回归（BRT）模型，我们已经基于预测的时间变异性计算了每个分集指数的观察/预期比率。多样性状态的评估已保持在0.5以占观察到50％的损失或偏差（O / E50）。该评估已成功地用来用大大“受损”的地位描绘AES1，从而确保其在物种保护方面的重要性。我们的研究表明，11个主要环境司机在这些AES中调制物种组合模式的贡献。其中，海拔，衬底粗糙度，河流和避难所可用性与BRT模型相比，与物种多样性密切相关。这些潜在因素也与“盆地压力”相关，表明人为紊乱以及变化的气候可能在环境条件的逐步变化中发挥重要作用，这反过来可能导致物种组合结构的转变。

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