title: Physiological stress response in white suckers from agricultural drain waters containing pesticides and selenium.
abstract: To assess the effect of agriculture drain water, a complex mixture containing pesticides and selenium (Se), on the physiological stress response, white suckers were collected from irrigation return flows in the summer and the fall and subjected to a stress challenge. Water (0.40-26.71microg/L) and muscle Se (0.37-1.52microg/g ww) levels were elevated at two sites and plasma acetylcholinesterase (AChE) activity (a marker of pesticide exposure) was lower in the fall (5.97+/-0.45micromol/min/mL) than the summer (10.73+/-0.73micromol/min/mL). Fish raised plasma cortisol levels in response to the stress challenge 11.8 times above basal levels (12.8+/-4.9ng/mL). Multivariate statistics linked Se exposure to elevated plasma glucose levels, and pesticide exposure to elevated liver glycogen levels generating hypotheses for further testing. This study showed that white suckers accumulated Se from agricultural drain water and the complex mixtures present in the drain water influenced the physiological stress response.
authors.affiliation: Department of Biological Sciences, University of Lethbridge, 4401 University Drive, Lethbridge, Alberta, Canada T1K 3M4. lana.miller@uleth.ca
authors.forename: L L
authors.initials: LL
authors.lastname: Miller
authors.forename: J B
authors.initials: JB
authors.lastname: Rasmussen
authors.forename: V P
authors.initials: VP
authors.lastname: Palace
authors.forename: A
authors.initials: A
authors.lastname: Hontela
mesh_terms: D000110:Acetylcholinesterase / Q000097:blood; D000383:Agriculture; D000416:Alberta; D000818:Animals; D001786:Blood Glucose / Q000378:metabolism; D003531:Cypriniformes / Q000502:physiology*; D005618:Fresh Water / Q000032:analysis; D006854:Hydrocortisone / Q000097:blood; D008112:Liver Glycogen / Q000378:metabolism; D018482:Muscle, Skeletal / Q000737:chemistry / Q000378:metabolism; D010575:Pesticides / Q000032:analysis / Q000633:toxicity*; D015203:Reproducibility of Results; D012621:Seasons; D012643:Selenium / Q000032:analysis / Q000493:pharmacokinetics / Q000633:toxicity*; D000254:Sodium-Potassium-Exchanging ATPase / Q000097:blood; D013312:Stress, Physiological / Q000502:physiology*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity*
chemical_list: D001786:Blood Glucose; D008112:Liver Glycogen; D010575:Pesticides; D014874:Water Pollutants, Chemical; D000110:Acetylcholinesterase; D000254:Sodium-Potassium-Exchanging ATPase; D012643:Selenium; D006854:Hydrocortisone