Agrochemicals’ effects on functional feeding groups of macroinvertebrates in Pampas streams

•Nutrients and endosulfan concentrations were higher in streams adjacent to crops.•Total invertebrate abundance and taxonomic richness were lower in cropped sites.•Shredders were dominant at the reserve and livestock streams.•Scrapers and predators were dominant at the cultivated sites.•Land use is causing change in functional feeding groups’ composition.