The terrestrial invader hemlock woolly adelgid (Adelges tsugae) decimates eastern hemlock (Tsuga canadensis) stands that dominate riparian zones of Appalachian forest streams. However, the ecological consequences for linked aquatic-terrestrial ecosystems remain unknown. We measured stream-riparian trophic linkages at 21 sites of Ohio, West Virginia, and Virginia representing a chronosequence of T. canadensis decline. We measured reciprocal fluxes of basal resources (periphyton, terrestrial detritus), emerging aquatic insect flux rate and community composition, riparian orb-weaving spider density, and estimated spider trophic position and reliance on aquatically-derived energy using stable isotopes (¹³C, ¹⁵N, ²H) and Bayesian mixing models. Stream periphyton biomass was greater at uninvaded reference sites than at invaded sites and composition of the terrestrial-to-stream detritus flux changed with T. canadensis decline. Emergent aquatic insect community composition was partly explained by hemlock decline status, but the relative abundance of functional feeding groups was not. Riparian orb-weaving spider densities were highest at sites with severe hemlock decline (F = 4.27, p = 0.022), but were not linked to insect emergence flux rates (p > 0.10). Both trophic position (\({\overline{x}}\) = 2.4) and relative reliance on aquatically-derived energy (\({\overline{x}}\) = 83%) were comparable among spider families (Tetragnathidae, Araneidae, Pisauridae) and site decline status. Although spider δ¹³C signatures were unrelated to those of the most numerous emergent insect families, δ¹⁵N signatures of Araneidae and Pisauridae tracked emergent insect δ¹⁵N (r² = 0.42 and 0.78, respectively), suggesting a trophic linkage. Overall, the ecological consequences of this invader were clearest at lower trophic levels, with more nuanced impacts on riparian spiders.

陆地入侵者铁杉羊毛阿德吉德（Adelges tsugae）消灭了东部铁杉（Tsuga canadensis）林分，该林分占据了阿巴拉契亚森林溪流的河​​岸带。但是，对联系的水陆生态系统的生态后果仍然未知。我们在俄亥俄州，西维吉尼亚州和维吉尼亚州的21个站点上测量了河岸营养连接，代表了加拿大山毛榉下降的时间序列。我们测量了基础资源的倒数通量（附生植物，陆生碎屑），新兴水生昆虫通量率和群落组成，河岸球编织蜘蛛的密度，并使用稳定同位素估算了蜘蛛的营养位置和对水生能源的依赖（¹³ C，¹⁵N，² H）和贝叶斯混合模型。在未入侵的参考点，河流周生植物生物量要比在入侵的地点要大，并且陆地—河流碎屑通量的组成随加拿大锥虫的减少而改变。铁杉下降状态可以部分解释出现的水生昆虫群落组成，但功能性摄食组的相对丰度却不能。河岸球编织蜘蛛的密度在铁杉重度下降严重的地方最高（F  = 4.27，p  = 0.022），但与昆虫出苗通量率无关（p  > 0.10）。营养位置（\（{\ overline {x}} \）  = 2.4）和对水生能量的相对依赖（\（{\ overline {x}} \） = 83％）在蜘蛛科（四翅目科，蜘蛛科，鹦鹉科）和位点下降状态之间具有可比性。虽然蜘蛛δ ^13个Ç签名是无关的那些最大量紧急昆虫家族，δ ^15个Araneidae和Pisauridae N个签名跟踪射昆虫δ ¹⁵ N（- [R ²  = 0.42和0.78，），提示营养联动。总体而言，在较低的营养水平下，这种入侵者的生态后果最为明显，对河岸蜘蛛的影响则更为细微。