title: Stream habitat structure influences macroinvertebrate response to pesticides.
abstract: Agricultural pesticides continue to impair surface water ecosystems, although there are few assessments of interactions with other modifications such as fine sediment and physical alteration for flood drainage. We, therefore, surveyed pesticide contamination and macroinvertebrates in 14 streams along a gradient of expected pesticide exposure using a paired-reach approach to differentiate effects between physically modified and less modified sites. Apparent pesticides effects on the relative abundance of SPEcies At Risk (SPEAR) were increased at sites with degraded habitats primarily due to the absence of species with specific preferences for hard substrates. Our findings highlight the importance of physical habitat degradation in the assessment and mitigation of pesticide risk in agricultural streams.
authors.affiliation: Aarhus University, Department of Bioscience, Vejlsøvej 25, 8600 Silkeborg, Denmark. jr@dmu.dk
authors.forename: Jes Jessen
authors.initials: JJ
authors.lastname: Rasmussen
authors.forename: Peter
authors.initials: P
authors.lastname: Wiberg-Larsen
authors.forename: Annette
authors.initials: A
authors.lastname: Baattrup-Pedersen
authors.forename: Nikolai
authors.initials: N
authors.lastname: Friberg
authors.forename: Brian
authors.initials: B
authors.lastname: Kronvang
mesh_terms: D000818:Animals; D044822:Biodiversity; D017753:Ecosystem; D004784:Environmental Monitoring; D007448:Invertebrates / Q000145:classification / Q000187:drug effects* / Q000254:growth & development; D010575:Pesticides / Q000032:analysis / Q000633:toxicity*; D045483:Rivers / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity*
chemical_list: D010575:Pesticides; D014874:Water Pollutants, Chemical