期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 71, 期 1, 页码 209-218出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2007.08.007
关键词
multiple stressors; pH; zooplankton; triclopyr; amphibian
资金
- NIEHS NIH HHS [P42 ES007373, P42 ES007373-15] Funding Source: Medline
- PHS HHS [P42 ESO7373-7] Funding Source: Medline
Interactions of herbicides and natural environmental stressors such as pH and food availability are poorly understood. We tested a chemical formulation of triclopyr (Release (R)) at environmentally relevant test concentrations (0.25 and 0.50 mg L-1) in combination with two levels of pH (pH 5.5 and 7.5), and two levels of food availability (high and low). Population level effects of each stressor alone and in combination with the others were investigated using Simocephalurs vetulus, a zooplankton species, and Rana pipiens tadpoles (Gosner stage 25), both common to forest ponds and wetlands. Herbicide treatments resulted in significant decreases in survival of both test species as well as reproduction and development time for S. vetulus at levels 5-10 x below predicted worst case environmental concentrations (2.6 mg L-1). This laboratory study demonstrates a probable risk of toxic effects of Release (R) herbicide which may be significantly increased by low food availability and by low pH at environmentally relevant concentrations. (C) 2007 Elsevier Inc. All rights reserved.
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