title: Biological Impacts in Fathead Minnow Larvae Following a 7-Day Exposure to Agricultural Runoff: A Microcosm Study.
abstract: The objective of this study was to investigate the impact of agricultural runoff on growth and development in fathead minnow larvae. Identifying these impacts in the field is difficult due to the complexity of pulsatile events and the challenge of maintaining larval fish under environmental conditions. This paper presents evidence of sublethal impacts on minnow larvae, maintained in microcosms, following a 7-day exposure to agricultural runoff. Fathead minnow larvae (5-12 dph) were exposed to agricultural runoff in the Elkhorn River, NE, USA. At 28 dph, 16 days after the field exposure, river exposed larvae showed reductions in body mass and length compared to controls. Female larvae exposed to river water also showed a reduction in the expression of cyp19a compared to controls. Further research will be necessary to separate the impact of agrichemicals from that of other stressors, such as suspended sediment and daily oscillation in water temperature.
authors.affiliation: Department of Environmental, Agricultural and Occupational Health, University of Nebraska Medical Center, Omaha, NE, 68198, USA.
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: Ali
authors.affiliation: Department of Biology, University of Nebraska at Omaha, 6001 Dodge St, Omaha, NE, 68182-0040, USA.
authors.forename: Yasmine A
authors.initials: YA
authors.lastname: Farhat
authors.affiliation: Department of Environmental, Agricultural and Occupational Health, University of Nebraska Medical Center, Omaha, NE, 68198, USA. akolok@unomaha.edu.|Department of Biology, University of Nebraska at Omaha, 6001 Dodge St, Omaha, NE, 68182-0040, USA. akolok@unomaha.edu.
authors.forename: Alan S
authors.initials: AS
authors.lastname: Kolok
mesh_terms: D016573:Agrochemicals / Q000032:analysis / Q000633:toxicity*; D000818:Animals; D003530:Cyprinidae / Q000254:growth & development* / Q000378:metabolism; D004784:Environmental Monitoring / Q000379:methods*; D005260:Female; D007814:Larva / Q000254:growth & development / Q000378:metabolism; D009329:Nebraska; D045483:Rivers / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity*
chemical_list: D016573:Agrochemicals; D014874:Water Pollutants, Chemical
keywords: Agricultural runoff; Early-life stages; Gene expression; Herbicides; Microcosms; Pimphales promelas