Journal
ENVIRONMENTAL POLLUTION
Volume 159, Issue 2, Pages 596-601Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2010.10.005
Keywords
Oil sand; Wetland; Metamorphosis; Wood frog; Thyroid hormone
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada
- Syncrude Canada Ltd.
- Suncor Energy Inc.
- Albian Sands Energy Inc.
- Canadian Natural Resources Ltd.
- Imperial Oil Ltd.
- Petro-Canada
- Total E and P Ltd
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The wet landscape approach to oil sands tailings reclamation in the Athabasca Oil Sands region involves creating wetlands from fluid tailings in mined-out pits. We measured time to metamorphosis, thyroid hormone status, and detoxification enzyme (EROD) induction in Wood frog (Lithobates sylvaticus) tadpoles raised on reclaimed oil sands wetlands of different ages [young (<= 7 yr) vs. old (>7 yr)] and compared data with tadpoles raised on reference (control) wetlands. Metamorphosis was delayed or never occurred in tadpoles raised in young tailings; those exposed to older tailings developed similarly to those in reference wetlands. Thyroid hormone disruption likely played an important role in the metamorphosis delay as the T3:T4 ratio was lowest in tadpoles raised in young, tailings-affected wetlands. Our findings suggest tailings wetlands become less toxic with age, and that these amphibians will be able to complete their life cycle in tailing wetlands that have sufficiently detoxified with age. (C) 2010 Elsevier Ltd. All rights reserved.
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