| Title: | "Detoxification, endocrine, and immune responses of tree swallow nestlings naturally exposed to air contaminants from the Alberta oil sands" |
| Author(s): | Cruz-Martinez L; Fernie KJ; Soos C; Harner T; Getachew F; Smits JE; |
| Address: | "Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, 3280 Hospital Drive NW Calgary, Alberta T2N 4Z6, Canada. Electronic address: luis.cruzmartinez@ucalgary.ca. Ecotoxicology & Wildlife Health Division, Science & Technology Branch, Environment Canada, 867 Lakeshore Rd., Burlington, Ontario L7R 4A6, Canada. Electronic address: kim.fernie@ec.gc.ca. Ecotoxicology & Wildlife Health Division, Science & Technology Branch, Environment Canada, 115 Perimeter Road, Saskatoon, Saskatchewan S7N 0X4, Canada. Electronic address: catherine.soos@ec.gc.ca. Air Quality Processes Research Section, Environment Canada, 4905 Dufferin Street, Toronto, Ontario M3H 5T4, Canada. Electronic address: tom.harner@ec.gc.ca. Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, 3280 Hospital Drive NW Calgary, Alberta T2N 4Z6, Canada. Electronic address: fgetache@ucalgary.ca. Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, 3280 Hospital Drive NW Calgary, Alberta T2N 4Z6, Canada. Electronic address: judit.smits@ucalgary.ca" |
| DOI: | 10.1016/j.scitotenv.2014.09.008 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "Changes in environmental and wildlife health from contaminants in tailings water on the Canadian oil sands have been well-studied; however, effects of air contaminants on wildlife health have not. A field study was conducted to assess biological costs of natural exposure to oil sands-related air emissions on birds. Nest boxes for tree swallows (Tachycineta bicolor) were erected at two sites; within 5 km of active oil sands mining and extraction, and >/= 60 km south, at one reference site. Passive air monitors were deployed at the nest boxes to measure nitrogen dioxide, sulfur dioxide, ozone, volatile organic compounds, and polycyclic aromatic hydrocarbons (PAHs). Nestlings were examined at day 9 post hatching to assess T cell function and morphometry. At day 14 post hatching, a subset of nestlings was euthanized to measure detoxification enzymes, endocrine changes, and histological alterations of immune organs. Except for ozone, all air contaminants were higher at the two oil sands sites than the reference site (up to 5-fold). Adult birds had similar reproductive performance among sites (p>0.05). Nestlings from industrial sites showed higher hepatic ethoxyresorufin O-dealkylase (EROD) induction (p<0.0001) with lower relative hepatic mass (p=0.0001), a smaller T cell response to the phytohemagglutinin skin test (p=0.007), and smaller bursae of Fabricius (p<0.02); a low sample size for one site indicating lower body condition scores (p=0.01) at day 14 warrants cautious interpretation. There were no differences among nestlings for feather corticosterone (p>0.6), and no histological alterations in the spleen or bursa of Fabricius (p>0.05). This is the first report examining toxicological responses in wild birds exposed to air contaminants from industrial activity in the oil sands. It is also the first time that small, individual air contaminant monitors have been used to determine local contaminant levels in ambient air around nest boxes of wild birds" |
| Keywords: | Air Pollutants/analysis/*metabolism/toxicity Alberta Animals Corticosterone/metabolism Endocrine System/drug effects Environmental Monitoring Feathers/metabolism Industrial Waste/analysis/statistics & numerical data Oil and Gas Fields Polycyclic Aromatic; |
| Notes: | "MedlineCruz-Martinez, Luis Fernie, Kim J Soos, Catherine Harner, Tom Getachew, Fitsum Smits, Judit E G eng Research Support, Non-U.S. Gov't Netherlands 2014/09/23 Sci Total Environ. 2015 Jan 1; 502:8-15. doi: 10.1016/j.scitotenv.2014.09.008. Epub 2014 Sep 19" |
