The ecology of headwater streams is tightly linked to the riparian zone through organic matter subsidies which are highly susceptible to alteration due to biological invasion. Lonicera maackii is a non-native shrub that is a highly successful invader of headwater stream riparian zones in the American Midwest. We assessed effects on benthic macroinvertebrates across a gradient of invasion intensity from references sites with minimal invasion to a site that had a very heavy invasion. Benthic macroinvertebrates were sampled throughout the year and compositional differences were assessed using Non-metric Multidimensional Scaling ordination, and by comparing the prevalence of sensitive (Ephemeroptera, Plectoptera, and Trichoptera: EPT) and tolerant (Chironomidae) macroinvertebrate taxa. We found strong evidence of variation among macroinvertebrate communities across the invasion gradient (ANOSIM R = 0.215, P = 0.004) and particularly strong separation between one of our reference sites with minimal invasion and the site with the heaviest invasion. Analysis of EPT taxa indicated a significant overall effect and pairwise comparisons indicated that the site with the heaviest invasion had the lowest percentage of sensitive taxa (P < 0.05). Our analysis of chironomids did not yield a statistically discernable effect, although the pattern of the data suggest higher dominance in the site with the heaviest invasion. These stream-scale results bolster prior laboratory and field experiments and provide evidence that terrestrial invasion of L. maackii impacts the benthic community present in headwater streams. These results provide impetus to re-focus stream management recommendations to include practices that control invasive plants in riparian forests.

水源流的生态通过有机物补贴与河岸带紧密相连，有机物补贴由于生物入侵而极易发生变化。忍冬忍冬是一种非本地灌木，是美国中西部上游水源河岸带地区非常成功的入侵者。我们评估了从入侵程度最小的参考位点到入侵非常严重的位点，整个入侵强度梯度对底栖大型无脊椎动物的影响。全年采样底栖大型无脊椎动物，并使用非度量多维标度排序，通过比较敏感（（翅目，翼翅目和蝶翅目：EPT）和宽容（Chironomidae）大型无脊椎动物类群的患病率，评估成分差异。我们找到了强有力的证据来证明整个无脊椎动物种群在整个入侵梯度上都有变化（ANOSIM R = 0.215，P = 0.004），并且我们的参考位置之一（入侵最小）和入侵最大的位置之间的分离特别强烈。EPT分类单元的分析显示出显着的总体效果，成对比较表明，入侵最严重的部位的敏感分类单元百分比最低（P  <0.05）。尽管数据模式表明入侵最重的部位具有较高的优势，但我们对手足类动物的分析并未产生统计学上可辨别的效果。这些溪流规模的结果加强了先前的实验室和野外实验，并提供了证据表明陆地入侵马氏乳杆菌影响源头溪流中的底栖生物群落。这些结果为重新调整溪流管理建议提供了动力，以包括控制沿岸森林中入侵植物的措施。