Land-use effects on aquatic macroinvertebrate diversity in subtropical highland grasslands streams

Knowledge of the frequency and occurrence macroinvertebrates throughout landscapes may clarify effects anthropic impacts on aquatic systems help guide conservation actions for watersheds. We evaluated macroinvertebrate α β diversity in streams four different subtropical phytophysiognomies: highland grasslands with arboreal riparian vegetation, without mixed ombrophilous forest silviculture. also how environmental factors influence diversity. sampled communities (by Surber sampler), litter input nets) physicochemical variables water multiparameter chemical analysis) at 10 sites zones a system. A total 2124 individuals were representing 41 taxa, high forest. The results indicate that heterogeneity increases food resource availability, as well Furthermore, was found to increase distance among unconnected streams. Areas silviculture had highest density values areas due organic material stock soil. Therefore, higher leaf decrease toxicity effect secondary compounds released by plant decomposition compared environments low systemic input, such grasslands. presence vegetation drives canopy openness, temperature, dissolved oxygen, orthophosphate streams, which control benthic macroinvertebrates. Homogeneous systems, naturally observed grasslands, plus openness richness density. although endemic species, be an important guideline legislation impacts, management, this specific zone.