title: Land use effect on invertebrate assemblages in Pampasic streams (Buenos Aires, Argentina).
abstract: Agriculture and livestock may contribute to water quality degradation in adjacent waterbodies and produce changes in the resident invertebrate composition. The objective of the present study was to assess land use effects on the stream invertebrate assemblages in rural areas of the Argentine Pampa. The four sampling events were performed at six sites in four streams of the Pampa plain; two streams were sampled inside a biosphere reserve, and another one was surrounded by extensive livestock fields. The fourth stream was sampled at three sites; the upstream site was adjacent to agricultural plots, the following site was adjacent to an intensive livestock plot and the downstream site was adjacent to extensive breeding cattle plots. Higher pesticide concentrations were found at the site adjacent to agricultural plots and higher nutrient concentrations at the sites adjacent to agricultural and intensive breeding cattle plots. The invertebrate fauna were also different at these sites. Multivariate analysis showed a relationship between nutrient concentrations and taxonomic composition. Amphipoda (Hyalella curvispina) was the dominant group in the reserve and extensive breeding cattle sites, but was not present in the agricultural site. Also, Chironomidae were absent from the agricultural site while present at other sites. Gasteropoda (Biomphalaria peregrina), Zygoptera, and Hirudinea were dominant at the most impacted agricultural and intensive breeding cattle sites.
authors: ILPLA (CONICET-CCT La Plata)-UNLP Instituto de Limnología "Dr. Raúl A. Ringuelet", Boulevard 120 y 62. La Plata, 1900, Buenos Aires, Argentina.
authors: Marina
authors: M
authors: Solis
authors: ILPLA (CONICET-CCT La Plata)-UNLP Instituto de Limnología "Dr. Raúl A. Ringuelet", Boulevard 120 y 62. La Plata, 1900, Buenos Aires, Argentina. hernanmugni@gmail.com.
authors: Hernán
authors: H
authors: Mugni
authors: Department of Environmental Science, Policy & Management, University of California, Berkeley, CA, 94720-3114, USA.
authors: Lisa
authors: L
authors: Hunt
authors: ILPLA (CONICET-CCT La Plata)-UNLP Instituto de Limnología "Dr. Raúl A. Ringuelet", Boulevard 120 y 62. La Plata, 1900, Buenos Aires, Argentina.
authors: Natalia
authors: N
authors: Marrochi
authors: ILPLA (CONICET-CCT La Plata)-UNLP Instituto de Limnología "Dr. Raúl A. Ringuelet", Boulevard 120 y 62. La Plata, 1900, Buenos Aires, Argentina.
authors: Silvia
authors: S
authors: Fanelli
authors: ILPLA (CONICET-CCT La Plata)-UNLP Instituto de Limnología "Dr. Raúl A. Ringuelet", Boulevard 120 y 62. La Plata, 1900, Buenos Aires, Argentina.
authors: Carlos
authors: C
authors: Bonetto
mesh_terms: D000383:Agriculture; D033304:Amphipoda; D000818:Animals; D059001:Aquatic Organisms; D001118:Argentina; D002417:Cattle; D004784:Environmental Monitoring; D007448:Invertebrates; D058751:Livestock; D010575:Pesticides / Q000032:analysis; D045483:Rivers; D060753:Water Quality
chemical_list: D010575:Pesticides
keywords: Land use; Macroinvertebrate assemblages; Nutrients; Pampasic streams; Pesticides