Effects of copper on periphyton communities assessed in situ using chemical-diffusing substrates |
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Authors: | Arnegard Matthew E McCormick Paul V Cairns John |
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Institution: | (1) 19376 Peter Roy Court, Burke, VA, 22015, U.S.A;(2) 2South Florida Water Management District, 3301 Gun Club Road, West Palm Beach, FL, 33416, U.S.A;(3) 3Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, U.S.A |
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Abstract: | Chemical-diffusing substrates were designed to allow delivery of toxicants to mature periphyton communities under natural
conditions without contaminating the surrounding environment. Artificial stream validation studies were conducted in which
the effects of substrate-released copper (Cu) on periphyton communities were compared to those generated in a more conventional
manner (via water column additions). Effects of copper on the following community parameters were assessed: total community
biomass (measured as ash-free dry mass), relative chlorophyll a (chl a and adenosine triphosphate contents, and relative biomass of heterotrophic bacteria. Exposure of more laboratory periphyton
communities to substrate-released Cu generated dose-response relationships and recovery models that were indistinguishable
from those generated by the conventional route of exposure. The results of this study demonstrate the utility of chemical-diffusing
substrates in field validations of laboratory toxicity tests and in investigations of the effects of stress history on periphyton
tolerance to toxicants.
This revised version was published online in September 2006 with corrections to the Cover Date. |
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Keywords: | periphyton copper toxicity diffusion substrate validation |
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