HR: 09:00h
AN: NB51A-03    [Abstracts]
TI: Feeding Inhibition: the Ups and Downs of Sublethal Effects on Grazers and Detritivores
AU: * Alexander, A
EM: c091m@unb.ca
AF: Canadian Rivers Institute, Dept Biology @ the University of New Brunswick, 10 Bailey Drive, Fredericton, NB E3B 6E1 Canada
AU: Culp, J
EM: Joseph.Culp@ec.gc.ca
AF: National Water Research Institute, Environment Canada, 10 Bailey Drive, Fredericton, NB E3B 6E1 Canada
AU: Liber, K
AF: Toxicology Center @ the University of Saskatchewan (Saskatoon), 44 Campus Drive, Saskatoon, SK S7N 5B3 Canada
AU: Baird, D
AF: National Water Research Institute, Environment Canada, 10 Bailey Drive, Fredericton, NB E3B 6E1 Canada
AB: Sublethal impacts are likely the primary mechanism of exposure for the aquatic community in the case of soluble agricultural pesticides. This study examines the effects of pulsed exposures of the common insecticide, imidacloprid, on the feeding and growth of the mayfly Epeorus longimanus, and the oligochaete, Lumbriculus variegatus. Examining the effects of pulsed exposures of imidacloprid is particularly relevant due to the soluble (0.51g/L) nature of this compound. Recovery experiments were conducted by exposing mayflies and oligochaetes to an environmentally realistic range (0, 0.1, 0.5, 1, 5, 10 ppb) of concentrations for a short period. Effects on feeding were measured by quantifying the foodstuffs consumed by mayflies and egested by oligochaetes. In tandem with the feeding experiments, a series of artificial stream experiments were undertaken that demonstrate the changes in growth and abundance of adult mayflies in response to this common insecticide stressor.
DE: 1803 Anthropogenic effects
DE: 1860 Runoff and streamflow
DE: 9902 NABS Student Award Applied Research
SC: North American Benthological Society [NB]
MN: 2005 Joint Assembly