Trophic structure in response to land use in subtropical streams

• ? 13 C and 15 N of aquatic organisms in streams varied among land uses. Aquatic resources contributed much more regardless Land use failed to influence the niche width or trophic diversity consumers. uplands can substantially impact biological community stream ecosystems, but how structure communities within riverine food webs respond catchment changes their respective remains unclear. Here, we investigated on two subtropical China. We measured isotopic compositions basal resources, four macroinvertebrate functional feeding groups (scrapers, collectors, shredders, predators with 132 taxa), three fish (herbivores, omnivores, piscivores 26 species) uses (woodland, agricultural, urban). Isotopic values were used estimate dietary proportions consumers (macroinvertebrates fish) community-level metrics (niche diversity). found that macroinvertebrates, significantly sampling sites adjacent Dietary analysis showed terrestrial relatively less (~20%) than higher levels, especially urban sites. Compared woodland sites, had lower redundancy, agricultural length width. Trophic alterations response primarily resulted from availability variability upstream river channel riparian zone, also plasticity macroinvertebrates and/or fish. These empirical findings indicate importance across all levels management ecosystems landscapes.