Small urban fragments maintain complex food webs of litter-dwelling arthropods in a subtropical city in China

营养水平 公会 生态学 优势(遗传学) 生态系统 食物链 城市化 城市生态系统 栖息地 食物网 植物凋落物 城市生态学 树上运动 碎屑岩 地理 城市森林 生物 环境科学 生物化学 基因
作者
Bin Wang,Saichao Zhang,Zhihong Qiao,Qibao Yan,Stefan Scheu,Xun Sun
出处
期刊:Soil Biology & Biochemistry [Elsevier]
卷期号:: 109150-109150
标识
DOI:10.1016/j.soilbio.2023.109150
摘要

Urbanization-induced environmental changes such as habitat fragmentation impact arthropod assemblages and food web-related ecosystem functions, such as nutrient cycling and energy fluxes. Yet, we lack insight into how arthropod food webs are structured along urban fragmentation gradients. Here, we investigated the community composition and food web structure of litter-dwelling arthropods along fragmentation gradients (green median strip, i.e. green fragments in the middle of roads, urban park, urban forest and natural forest) in Xiamen City, southeast China. We found the density of litter-dwelling arthropods in median strips and urban parks to be two to four times higher than in urban and natural forests, with, as indicated by literature-based stable isotope values, 67%–68% of the individuals comprising primary consumers (trophic level I). Consequently, more complex food webs were found in small urban fragments (i.e., green median strip and urban park) than in the other fragments studied, including higher linkage density and higher energy flux. The biomass of litter on the floor was significantly correlated with the density of arthropods of trophic levels I, III and IV, and each trophic guild positively correlated with each other pointing to the dominance of bottom-up forces. Overall, our results suggest that small urban fragments maintain a high density of arthropods forming complex food webs and thereby may contribute to maintaining high energy fluxes and providing important ecosystem functions in urban areas.
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