title: Isonychia spp. and macroinvertebrate community responses to stressors in streams utilizing the benthic in situ toxicity identification evaluation (BiTIE) method.
abstract: Exposures of caged organisms in situ have proven to be a useful way to improve exposure realism and link to stressor effects in aquatic assessments of hazard or risk. A novel cage system, the benthic in situ toxicity identification evaluation (BiTIE), was developed for benthic macroinvertebrates (surrogate species, resident populations and communities) to separate low and high flow effects, and major chemical classes of stressors in streams. Three resin types were used to separate the chemical stressors in the streams Honey Creek and Little Beavercreek, Ohio, USA: Dowex Optipore (non-polar organics), zeolite (ammonia), and polywool (control). Isonychia spp. sensitivity was compared to Chironomus tentans, and no significant differences were found (p>0.05). Isonychia spp. growth (length) showed a stressor response in the zeolite treatments, and community testing revealed improved metric responses in the Dowex treatments. The BiTIE chamber system demonstrated stressor-response relationships using sublethal and multimetric endpoints.
authors.affiliation: Department of Earth and Environmental Sciences, Wright State University, 127 Allyn Hall, 3640 Colonel Glenn Highway, Dayton, OH 45435, USA. custer.4@wright.edu
authors.forename: Kevin W
authors.initials: KW
authors.lastname: Custer
authors.forename: G Allen
authors.initials: GA
authors.lastname: Burton
mesh_terms: D000818:Animals; D044822:Biodiversity; D004781:Environmental Exposure; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods*; D004787:Environmental Pollution / Q000009:adverse effects* / Q000032:analysis; D019015:Geologic Sediments / Q000737:chemistry; D007313:Insecta / Q000187:drug effects* / Q000254:growth & development; D009820:Ohio; D045483:Rivers; D018675:Toxicity Tests / Q000295:instrumentation / Q000379:methods; D014874:Water Pollutants, Chemical / Q000633:toxicity
chemical_list: D014874:Water Pollutants, Chemical