title: Organochlorine pesticides and polychlorinated biphenyls (PCBs) in eggs of red-legged frogs (Rana aurora) and northwestern salamanders (Ambystoma gracile) in an agricultural landscape.
abstract: Organochlorine pesticides were widely used in the past in Sumas Prairie, British Columbia, Canada. In the 1990s, the hatching success of amphibians from agricultural sites was significantly depressed in the Sumas Prairie compared to reference sites. Therefore, in this study, organochlorine pesticides and polychlorinated biphenyls (PCBs) were measured in eggs of red-legged frogs (Rana aurora) and northwestern salamanders (Ambystoma gracile) from the Sumas Prairie. Egg masses were sampled from three agricultural sites that were exposed to agricultural runoff, and three reference sites that had lower agricultural runoff exposures. Not only was there little difference in contamination between agricultural and reference sites, but the levels of pesticides and PCBs found were lower than the concentrations reported to cause developmental or behavioural problems in amphibians.
authors: Canadian Wildlife Service, Environment Canada, Delta, BC.
authors: Shane R
authors: SR
authors: de Solla
authors: Christine A
authors: CA
authors: Bishop
authors: Karen E
authors: KE
authors: Pettit
authors: John E
authors: JE
authors: Elliott
mesh_terms: D000383:Agriculture; D000557:Ambystoma; D000818:Animals; D004531:Eggs; D004781:Environmental Exposure; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis / Q000493:pharmacokinetics*; D007306:Insecticides / Q000032:analysis / Q000493:pharmacokinetics*; D011078:Polychlorinated Biphenyls / Q000032:analysis / Q000493:pharmacokinetics*; D011898:Ranidae; D018570:Risk Assessment; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000493:pharmacokinetics*
chemical_list: D004785:Environmental Pollutants; D007306:Insecticides; D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls