Current Velocity: a Driving Factor for Structuring Zoobenthos Community in a Fluvial System of Indian Himalaya

IF 0.8 4区生物学 Q4 MARINE & FRESHWATER BIOLOGY

Inland Water Biology Pub Date : 2024-08-30 DOI:10.1134/s1995082924700469

Asheesh Shivam Mishra

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Abstract

Study was conducted to determine the impact of current velocity on density and abundance of benthic macroinvertebrate fauna in an Indian Himalayan River, the Ramganga. The samples were collected at 8 different stations from headwater to mouth (S1 to S8) during October 2014 to March 2015. One-time intensive sampling (20 quadrates per station) was performed in the dry-period. The benthic macroinvertebrate samples were collected to all possible current velocities at each station from 7 cm to 55 cm depth. and they were categorized in to 5 categories of current velocity; extreme low (type I, 0–15 cm s^–1), low (type II, 15–30 cm s^–1), mild (type III, 30–45 cm s^–1), moderate (type IV, 45–60 cm s^–1) and high (type V, >60 cm s^–1). The standard methods were used to collect invertebrate samples and identify at family level. The total mean density of invertebrate fauna decreased from type I (616 ind. × m^–2) to type II (358.87 ind. × m^–2), and increased to type III (925.25 ind. × m^–2), but again decreased to type IV (539.37 ind. × m^–2) and type V (85.25 ind. × m^–2). The mild velocity (type III) was most important for providing maximum density and richness. The total density (ind. × m^–2) between every two current velocity types was not found significantly different except current velocity type V-I. Total 34 taxa were observed among all the stations, maximum number (22) taxa were found in type III, while lowest number (8) in type IV. However, out of 34 taxa, Glossoscolecidae was most abundant in type I velocity, Simulidae in type II, Leptoceridae in type III and V, while Psephenidae in type IV. Similarly, PCA also suggested the characteristics taxa at each velocity type.

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流速：印度喜马拉雅冲积系统底栖动物群落结构的驱动因素

摘要研究旨在确定水流速度对印度喜马拉雅山脉河流拉姆甘加河底栖大型无脊椎动物密度和丰度的影响。样本于 2014 年 10 月至 2015 年 3 月期间在从上游到河口（S1 至 S8）的 8 个不同站点采集。在枯水期进行了一次性密集采样（每个站点 20 个四分点）。底栖大型无脊椎动物样本在每个站点从 7 厘米到 55 厘米深度的所有可能流速下采集，并按流速分为 5 类：极低（I 类，0-15 厘米 s-1）、低（II 类，15-30 厘米 s-1）、轻（III 类，30-45 厘米 s-1）、中（IV 类，45-60 厘米 s-1）和高（V 类，60 厘米 s-1）。采用标准方法采集无脊椎动物样本并进行科级鉴定。无脊椎动物总平均密度从 I 型（616 ind. × m-2）下降到 II 型（358.87 ind. × m-2），然后上升到 III 型（925.25 ind. × m-2），但又下降到 IV 型（539.37 ind. × m-2）和 V 型（85.25 ind. × m-2）。轻度速度（III 型）对提供最大密度和丰富度最为重要。除 V-I 型流速外，每两种流速之间的总密度（指数×米-2）均无显著差异。各站共观察到 34 个分类群，其中类型 III 的分类群数量最多（22 个），类型 IV 的分类群数量最少（8 个）。然而，在 34 个分类群中，I 型流速下的 Glossoscolecidae 种类最多，II 型流速下的 Simulidae 种类最多，III 型和 V 型流速下的 Leptoceridae 种类最多，而 IV 型流速下的 Psephenidae 种类最少。同样，PCA 也显示了各速度类型的特征类群。

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来源期刊

Inland Water Biology 生物-海洋与淡水生物学

CiteScore

1.30

自引率

55.60%

发文量

审稿时长

6-12 weeks

期刊介绍： Inland Water Biology publishes thematic reviews and original papers devoted to flora and fauna in waterbodies, biodiversity of hydrobionts, biology, morphology, systematics, ecology, ethology, ecological physiology and biochemistry of aquatic organisms, patterns of biological cycle, structure and functioning of aquatic ecosystems, anthropogenic and uncontrolled natural impacts on aquatic organisms and ecosystems, invasion of nonindigenous species into ecosystems and their ecology, methods of hydrobiological and ichthyological studies.