Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 132, Issue -, Pages 18-25Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2016.05.019
Keywords
Yeast; Toxicity; Groundwater; Risk assessment; Metals
Categories
Funding
- Macquarie University, Australia New Staff Grant [9201201042]
- New South Wales Environmental Trust [2010/RDS/0046]
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The recent inclusion of yeasts in environmental monitoring recognizes their ecological significance and sensitivity to toxicants. Here we present a robust and simple two-step toxicity assay and demonstrate the sensitivity of an ubiquitous groundwater yeast, Rhadotorula minuta, to a range of metals and metalloids. The test species was sensitive to copper with a 24 h EC50 of 35 mu g Cu/L, followed in order of decreasing sensitivity by zinc, chromium (VI) and arsenic (EC50 4.40 mg As (III)/L.). The strain demonstrated an unexpected tolerance to chromium (VI), having an EC50 value (3.45 mg Cr (VI)/L) similar to that of arsenic. The inclusion of a unicellular, microbial test -species into the suite of existing multicellular test species for toxicity evaluation is a key step towards strengthening the assessment of risk for groundwater ecosystems. (C) 2016 Elsevier Inc. All rights reserved.
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