Plant invasions in coastal ecosystems may substantially alter benthic community composition and food web structure. We combined analyses of stable isotopes and fatty acids (FA) to examine the effects of two non-indigenous plants (Spartina alterniflora and Kandelia candel) on the food sources of three deposit feeders (Assiminea brevicula, Cerithidea cingulata and Uca arcuata) and a carnivorous opportunistic predator (Periophthalmus modestus) in Yueqing Bay, China. A wide range of differences was found in δ¹³C and δ¹⁵N among the macrobenthos. The deposit feeders in K. candel mangrove forest (KC) were markedly more ¹³C-depleted than those in S. alterniflora marsh (SA) and unvegetated tidal flat (TF), unlike the carnivorous feeder. PERMANOVA showed that FA composition significantly differed among the macrobenthos. Diatom FA markers were higher in tissues of the deposit feeders than in the carnivorous feeder, and slightly lower in macrobenthos from the KC and SA habitats as compared with the TF. In contrast, vascular plant FA markers of macrobenthos were higher in the KC and SA than in the TF, indicating the contribution of mangrove and Spartina detritus to the consumers. The findings show that the food sources of macrobenthos were markedly affected by non-indigenous plants, through the addition of organic detritus derived from vascular plants in the diets together with a decreased contribution of diatoms, although the impacts may differ among different functional feeding groups of macrobenthos.

沿海生态系统中的植物入侵可能会大大改变底栖生物群落组成和食物网结构。我们结合稳定同位素和脂肪酸（FA）的分析来检验两种非本土植物（互花米草和坎德里亚candel）对三种存款饲养者（Assiminea brevicula，Cerithidea cingulata和Uca arcuata）和食肉动物的食物来源的影响乐清湾的机会性捕食者（Periophthalmusmodetus）。宽范围的差异δ发现¹³ C和δ ¹⁵ n中的底栖之间。K中的存款支线。坎德尔红树林（KC）均显着更多¹³比在C-耗尽小号。与食肉食肉动物不同，互花米草沼泽（SA）和无植被的潮滩（TF）。PERMANOVA表明，大底栖动物之间的FA组成明显不同。与TF相比，沉积物饲养者的组织中硅藻FA标志物高于肉食饲养者，而来自KC和SA栖息地的大型底栖动物中的硅藻FA标志物则略低。相比之下，大底栖动物的维管束植物FA标记在KC和SA中比在TF中更高，表明红树林和Spartina的贡献对消费者有害。研究结果表明，通过在日粮中添加源自维管植物的有机碎屑以及降低硅藻的贡献，大底栖动物的食物来源受到非本地植物的显着影响，尽管不同功能性摄食组之间的影响可能有所不同。大型底栖动物。