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Environ Res
Title: | Changes in thyroid function of nestling tree swallows (Tachycineta bicolor) in relation to polycyclic aromatic compounds and other environmental stressors in the Athabasca Oil Sands Region |
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Author(s): | Fernie KJ; Marteinson SC; Chen D; Palace V; Peters L; Soos C; Smits JEG; |
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Address: | "Ecotoxicology & Wildlife Health Division, Science & Technology Branch, Environment and Climate Change Canada, Burlington, Ontario, Canada L7R 1A2. Electronic address: kim.fernie@canada.ca. Ecotoxicology & Wildlife Health Division, Science & Technology Branch, Environment and Climate Change Canada, Burlington, Ontario, Canada L7R 1A2. School of Environment, Guangzhou Key Laboratory of Environmental Exposure and Health, and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou, Guangdong 510632, China. International Institute for Sustainable Development - Experimental Lakes Area, 111 Lombard Avenue, Suite 325, Winnipeg, Manitoba, Canada R3B 0T4. Riddell Faculty of Earth Environment and Resources, University of Manitoba, 125 Dysart Road, Winnipeg, Manitoba, Canada R3T 2N2. Ecotoxicology & Wildlife Health Division, Science & Technology Branch, Environment and Climate Change Canada, 115 Perimeter Rd, Saskatoon, Saskatchewan, Canada S7N 0X4. Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, 3280 Hospital Drive NW, Calgary, Alberta, Canada T2N 4Z6" |
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Journal Title: | Environ Res |
Year: | 2019 |
Volume: | 20181122 |
Issue: | |
Page Number: | 464 - 475 |
DOI: | 10.1016/j.envres.2018.11.031 |
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ISSN/ISBN: | 1096-0953 (Electronic) 0013-9351 (Linking) |
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Abstract: | "In the Canadian Athabasca Oil Sands Region (AOSR), nestling tree swallows (Tachycineta bicolor) raised near mining-related activities accumulated greater concentrations of polycyclic aromatic compounds (PACs) that contributed to their poorer condition, growth, and reproductive success. Here, we report changes in thyroid function of the same 14?ª+day old (do) nestlings (N?ª+=?ª+68) at these mining-related sites (OS1, OS2) compared to reference nestlings (REF1), and in relation to multiple environmental stressors that influence avian thyroid function. Thyroid function was compromised for OS1 nestlings but generally comparable between OS2 and REF1 chicks. In 2012, circulating total triiodothyronine (TT3) and thyroxine (TT4) were similar among all nestlings. The OS1 chicks had more active thyroid glands based on histological endpoints. Hepatic T4 outer-ring deiodinase (T4-ORD) activity was suppressed in OS1 and OS2 chicks. Despite inter-annual differences, OS1 chicks continued experiencing compromised thyroid function with significantly higher circulating TT4 and more active thyroid glands in 2013. The OS2 chicks had less active thyroid glands, which conceivably contributed to their suppressed growth (previously reported) relative to the heavier OS1 nestlings with more active thyroid glands. Thyroid gland activity was more influenced by the chicks' accumulation of (muscle), than exposure (feces) to naphthalene, C2-naphthalenes, and C1-fluorenes. Of four major volatile organic contaminants, sulfur dioxide (SO(2)) primarily influenced thyroid gland activity and structure, supporting previous findings with captive birds. When collectively considering environmental-thyroidal stressors, chicks had a greater thyroidal response when they experienced colder temperatures, accumulated more C2-naphthalenes, and consumed aquatic-emerging insects with higher PAC burdens than terrestrial insects (carbon (delta(13)C)). We hypothesize that the more active thyroid glands and higher circulating TT4 of the OS1 chicks supported their growth and survival despite having the highest PAC burdens, whereas the lack of thyroid response in the OS2 chicks combined with high PAC burdens, contributed to their smaller size, poorer condition and poorer survival" |
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Keywords: | Animals Canada *Environmental Monitoring Environmental Pollutants/*toxicity Oil and Gas Fields Polycyclic Compounds/*toxicity Sand Swallows/*physiology Thyroid Gland/*physiology Trees Air pollution Athabasca Oil Sands Region Bird Multiple stressors PACs T; |
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Notes: | "MedlineFernie, K J Marteinson, S C Chen, D Palace, V Peters, L Soos, C Smits, J E G eng Research Support, Non-U.S. Gov't Netherlands 2018/12/12 Environ Res. 2019 Feb; 169:464-475. doi: 10.1016/j.envres.2018.11.031. Epub 2018 Nov 22" |
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Citation: El-Sayed AM 2024. The Pherobase: Database of Pheromones and Semiochemicals. <http://www.pherobase.com>.
© 2003-2024 The Pherobase - Extensive Database of Pheromones and Semiochemicals. Ashraf M. El-Sayed.
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