Journal
ENVIRONMENTAL POLLUTION
Volume 190, Issue -, Pages 1-9Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2014.03.008
Keywords
Co-tolerance; Pollution induced community tolerance; PICT; Soil ecotoxicology
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Funding
- New Zealand Ministry of Science and Innovation [C08X0802]
- New Zealand Ministry of Business, Innovation & Employment (MBIE) [C08X0802] Funding Source: New Zealand Ministry of Business, Innovation & Employment (MBIE)
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Pollution induced community tolerance (PICT) to Cu2+, and co-tolerance to nanoparticulate Cu, ionic silver (Ag+), and vancomycin were measured in field soils treated with Cu2+ 15 years previously. EC50 values were determined using substrate induced respiration and correlations made against soil physicochemical properties, microbial community structure, physiological status (qCO(2); metabolic quotient), and abundances of genes associated with metal and antibiotic resistance. Previous level of exposure to copper was directly (P < 0.05) associated with tolerance to addition of new Cu2+, and also of nanoparticle Cu. However, Cu-exposed communities had no co-tolerance to Ag+ and had increased susceptibly to vancomycin. Increased tolerance to both Cu correlated (P < 0.05) with increased metabolic quotient, potentially indicating that the community directed more energy towards cellular maintenance rather than biomass production. Neither bacterial or fungal community composition nor changes in the abundance of genes involved with metal resistance were related to PICT or co-tolerance mechanisms. (C) 2014 Elsevier Ltd. All rights reserved.
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