Agricultural land use affects the heterogeneity of Odonata communities in the Brazilian Pampa

Farming expansion has negative impacts on freshwater biodiversity. However, the effects of agricultural land use are not similar across taxa and depend local context. For instance, understudied in Neotropics (one leading regions cropland expansion). Knowledge aquatic insects from South American subtropical grasslands (Pampa) is even more incipient. We tested whether landscape modification related to increased was associated with taxonomic homogenization odonate communities waterbodies Brazilian Pampa. Odonates were collected differing main land-use class their surroundings (cropland or grassland). Cropland grassland sites differed respect abiotic conditions (water chemistry) species composition Odonata. Additionally, we found higher variation Odonata (and suborders Anisoptera Zygoptera separately) than sites. an interplay between uses Specifically, by agriculture modified waterbodies, which may have favored able establish as larvae under harsher environmental conditions. suggest that maintenance mixed-grassland fields adjacent can limit encroachment biotic