We analyzed the influence of land use and water physical-chemical characteristics on the trait composition of benthic macroinvertebrates in arid-land streams of North-East Algeria. Macroinvertebrates were sampled in the spring season of 2015, 2017 and 2018 at 36 sampling sites distributed along 5 streams of the Belezma biosphere reserve. Samples were taken from the various substratum types using a Surber net. Most of the variability of the trait-environment relationship was explained by increasing temperature and conductivity along the downstream gradient. Whilst agriculture at higher elevations did not have a great influence on the functional trait composition of macroinvertebrate communities, agriculture and urbanization at lower elevations generated significant deviations from predictable functional structures. Owing to the natural downstream decrease in community diversity in streams of the study region, entire taxa and/or functional groups were more likely to be wiped out in response to anthropogenic perturbations at lower elevations. Despite human activities, climate-related variables in arid lands play a major role on hydrological regimes that effect instream habitats, water chemistry, and macroinvertebrate communities. Given the environmental constraints in arid-land streams of North Africa, even slight increases in anthropogenic pressure can have negative effects on the taxonomic and functional composition of macroinvertebrate communities.

我们分析了土地利用和水体物理化学特征对阿尔及利亚东北部干旱地区河流底栖大型无脊椎动物性状组成的影响。大型无脊椎动物于 2015 年、2017 年和 2018 年春季在分布于贝列兹马生物圈保护区 5 条河流的 36 个采样点进行了采样。使用 Surber 网从各种基质类型中取样。性状-环境关系的大部分可变性可以通过沿下游梯度增加的温度和电导率来解释。虽然较高海拔的农业对大型无脊椎动物群落的功能性状组成没有很大影响，但较低海拔的农业和城市化与可预测的功能结构产生了显着偏差。由于研究区域河流下游群落多样性的自然减少，整个分类群和/或功能群更有可能因低海拔处的人为扰动而被消灭。尽管有人类活动，干旱土地中与气候相关的变量在影响河流栖息地、水化学和大型无脊椎动物群落的水文状况方面发挥着重要作用。鉴于北非干旱地区河流的环境限制，即使人为压力的轻微增加也会对大型无脊椎动物群落的分类和功能组成产生负面影响。尽管有人类活动，干旱土地中与气候相关的变量在影响河流栖息地、水化学和大型无脊椎动物群落的水文状况方面发挥着重要作用。鉴于北非干旱地区河流的环境限制，即使人为压力的轻微增加也会对大型无脊椎动物群落的分类和功能组成产生负面影响。尽管有人类活动，干旱土地中与气候相关的变量在影响河流栖息地、水化学和大型无脊椎动物群落的水文状况方面发挥着重要作用。鉴于北非干旱地区河流的环境限制，即使人为压力的轻微增加也会对大型无脊椎动物群落的分类和功能组成产生负面影响。