Cytochrome P4501A biomarker indication of the timeline of chronic exposure of Barrow's goldeneyes to residual Exxon Valdez oil.
We examined hepatic EROD activity, as an indicator of CYP1A induction, in Barrow's goldeneyes captured in areas oiled during the 1989 Exxon Valdez spill and those from nearby unoiled areas. We found that average EROD activity differed between areas during 2005, although the magnitude of the difference was reduced relative to a previous study from 1996/1997, and we found that areas did not differ by 2009. Similarly, we found that the proportion of individuals captured from oiled areas with elevated EROD activity (≥ 2 times unoiled average) declined from 41% in winter 1996/1997 to 10% in 2005 and 15% in 2009. This work adds to a body of literature describing the timelines over which vertebrates were exposed to residual Exxon Valdez oil and indicates that, for Barrow's goldeneyes in Prince William Sound, exposure persisted for many years with evidence of substantially reduced exposure by 2 decades after the spill.
Centre for Wildlife Ecology, Simon Fraser University, 5421 Robertson Road, Delta, Canada. desler@sfu.ca
Daniel
D
Esler
Brenda E
BE
Ballachey
Kimberly A
KA
Trust
Samuel A
SA
Iverson
John A
JA
Reed
A Keith
AK
Miles
John D
JD
Henderson
Bruce R
BR
Woodin
John J
JJ
Stegeman
Malcolm
M
McAdie
Daniel M
DM
Mulcahy
Barry W
BW
Wilson
D000818:Animals; D015415:Biomarkers / Q000378:metabolism; D055884:Chemical Hazard Release; D019363:Cytochrome P-450 CYP1A1 / Q000378:metabolism*; D004372:Ducks / Q000378:metabolism*; D004781:Environmental Exposure / Q000032:analysis*; D005260:Female; D008099:Liver / Q000378:metabolism; D008297:Male; D010578:Petroleum / Q000378:metabolism* / Q000633:toxicity; D014874:Water Pollutants, Chemical / Q000378:metabolism* / Q000633:toxicity
D015415:Biomarkers; D010578:Petroleum; D014874:Water Pollutants, Chemical; D019363:Cytochrome P-450 CYP1A1