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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Macrozoobenthos patterns along environmental gradients and hydrological connectivity of oxbow lakes
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Macrozoobenthos patterns along environmental gradients and hydrological connectivity of oxbow lakes

机译：牛弓湖沿环境梯度和水文连通性的大型动物

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摘要

Hydrological connectivity and the frequency and intensity of floods are the key factors determining the structure of macroinvertebrates inhabiting wetland ecosystems in river valleys. In 2007, water and macroinvertebrate samples were collected on four occasions in the middle course of the Stupia River and in five oxbow lakes (Northern Poland) to determine the hydrological relations in a regulated lowland river environment marked by a moderate climate. The water bodies selected for the study featured different types of connections with the main river valley: two of them were completely cut off from the valley, one was connected via a single branch, one featured a forced-flow connection through drainage pipes, and one was connected by a system of drainage channels. Macroinvertebrates, mostly Chirono-midae larvae, were predominant in the eutrophic waters of the river. The prevalent macroinvertebrates found in the eutrophicated oxbow lakes isolated from the river were Chironomidae larvae and Crustacea (mainly Asellus aquaticus). In unobstructed oxbow lakes, the main component of benthic fauna was Crustacea, while Ephemeroptera were found mostly in the water body connected to the river via a drainage channel. A canonical correspondence analysis (CCA) showed that hydrological connectivity was the main factor responsible for the structure of invertebrate populations, followed by the physical and chemical parameters of the local environment. A non-conformance analysis revealed that hydrological connectivity enhanced invertebrate abundance and biological diversity, while the overall abundance was marked by unimodal distribution. The developed general model indicates that in the group of measured environmental variables, nitrite concentrations were highly correlated with Shannon diversity and invertebrate composition, while sulphate levels were closely associated with invertebrate abundance in the waters of the analyzed ecosystems.
机译：水文连通性以及洪水的频率和强度是决定居住在河谷湿地生态系统中的大型无脊椎动物结构的关键因素。 2007年，在Stupia河的中游路线和五个oxbow湖（波兰北部）中，四次采集了水和大型无脊椎动物样品，以确定在气候适度的低地调节河流环境中的水文关系。研究中选择的水体与主要河谷的连接方式不同：其中两个完全从河谷中切断，一个通过单支连接，一个通过排水管强制流连接，另一个通过排水系统相连。河流的富营养化水域主要是大型无脊椎动物，主要是奇罗诺-科的幼虫。从河中分离出来的富营养化牛弓湖中普遍存在的大型无脊椎动物是Chironomidae幼虫和Crustacea（主要是Asellus aquaticus）。在通畅的牛弓湖中，底栖动物的主要成分是甲壳纲，而星翅目则主要存在于通过排水通道与河流相连的水体中。典范对应分析（CCA）表明，水文连通性是造成无脊椎动物种群结构的主要因素，其次是当地环境的物理和化学参数。不符合分析表明，水文连通性增强了无脊椎动物的丰度和生物多样性，而总体丰度则以单峰分布为特征。发达的一般模型表明，在所测量的环境变量组中，亚硝酸盐浓度与香农多样性和无脊椎动物组成高度相关，而硫酸盐水平与所分析生态系统水域中的无脊椎动物丰富度密切相关。

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