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首页> 外文期刊>Southeastern naturalist >Macroinvertebrate Community Responses to Gravel Addition in a Southeastern Regulated River
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Macroinvertebrate Community Responses to Gravel Addition in a Southeastern Regulated River

机译：东南调节河中大型无脊椎动物群落对砾石添加的响应

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摘要

Sediment transport, one of the key processes of river systems, is altered or stopped by dams, leaving lower river reaches barren of sand and gravel, both of which are essential habitat for fish and macroinvertebrates. One way to compensate for losses in sediment is to supplement gravel to river reaches below impoundments. Because gravel addition has become a widespread practice, it is essential to evaluate the biotic response to restoration projects in order to improve the efficacy of future applications. The purpose of our study was to evaluate the response of the macroinvertebrate community to gravel addition in a high-gradient, regulated river in western North Carolina. We collected benthic macroinvertebrate samples from gravel-enhanced areas and unenhanced areas for 1 season before gravel addition, and for 4 seasons afterwards. Repeated measures multivariate analysis of variance indicated that the responses of macroinvertebrates to gravel addition were generally specific to individual taxa or particular functional feeding groups and did not lead to consistent patterns in overall family richness, diversity, density, or evenness. Non-metric multi-dimensional scaling showed that shifts in macroinvertebrate community composition were temporary and dependent upon site conditions and season. Correlations between macroinvertebrate response variables and substrate microhabitat variables existed with or without the inclusion of data from enhanced areas, which suggests that substrate-biotic relationships were present before gravel addition. A review of the current literature suggests that the responses of benthic macroinvertebrates to substrate restoration are inconsistent and dependent upon site conditions and the degree habitat improvement of pre-restoration site conditions.
机译：沉积物的运输是河流系统的关键过程之一，被水坝改变或阻止，使下游河流到达贫瘠的沙子和砾石，这两个都是鱼类和大型无脊椎动物的重要栖息地。补偿沉积物损失的一种方法是将砾石添加到蓄水量以下的河段。由于添加砾石已成为一种普遍的做法，因此必须评估生物对修复项目的反应，以提高未来应用的功效。我们研究的目的是评估北卡罗来纳州西部一条高梯度，受管制的河流中大型无脊椎动物群落对砾石添加的响应。我们在添加砾石之前的1个季节，从添加砾石的地区和未增强的地区收集底栖大型无脊椎动物样本，之后又收集了4个季节。重复测量的方差多元分析表明，大型无脊椎动物对砾石添加的响应通常特定于单个分类群或特定的功能性进食组，并且没有导致总体家庭富裕度，多样性，密度或均匀性的一致模式。非度量多维标度显示，大型无脊椎动物群落组成的变化是暂时的，取决于地点条件和季节。大型无脊椎动物反应变量和基质微生境变量之间存在相关性，无论是否包含增强区域的数据，这表明在添加砾石之前存在基质与生物的关系。对当前文献的回顾表明，底栖大型无脊椎动物对基质恢复的反应是不一致的，并且取决于场地条件和恢复前场地条件的栖息地改善程度。

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