Comparative responses of target and nontarget species to exposures of a copper based algaecide

In order for water resource managers to make informed, risk-based decisions for algaecide applications, data are needed regarding the relative sensitivities of targeted algal species and nontarget animal species. The objective of this research was to measure responses of eight target algal species (...

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Bibliographic Details
Published in:Journal of aquatic plant management 2014, Vol.52, p.65-70
Main Authors: BISHOP, WEST M, Johnson, B M, RODGERS, J H
Format: Article
Language:English
Subjects:
Azteca
Ceriodaphnia dubia
Cymbella tumida
Daphnia magna
Desmidium
Eudorina elegans
Lepomis macrochirus
Microcystis aeruginosa
Nostoc punctiforme
Pandorina charkowiensis
Pimephales promelas
Pluvialis
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Summary:In order for water resource managers to make informed, risk-based decisions for algaecide applications, data are needed regarding the relative sensitivities of targeted algal species and nontarget animal species. The objective of this research was to measure responses of eight target algal species (Anki stro desmus falcatus Corda, Cymbella tumida Brebisson, Desmidium sp., Eudorina elegans Ehrenberg, Haematococcuspluvialis Flotow, Microcystis aeruginosa Kutzing, Nostoc punctiforme Kutzing, and Pandorina charkowiensis Korschikov) and five nontarget animal species (Ceriodaphnia dubia Richard, Daphnia magna Straus, Hyallela azteca Saussure, Lepomis macrochirus Rafinesque, Pimephales promelas Rafinesque) to exposures of a copper-based algaecide (a.i. copper 5%) in 96-h laboratory toxicity tests. The copper concentrations required to achieve control (i.e. 96-h EC sub(90)) of the targeted algae were 110, 120, 180, 200, 620, 630, 720, and 730 mu g/L for C. tumida, A. falcatus, H. pluvialis, P. charkowiensis, E. elegans, N. punctiforme, M. aeruginosa, and Desmidium sp., respectively. For the animal species, the copper concentrations that elicited a 96-h LC sub(50) were 4.6, 48, 250, 390, and 67,000 mu g/L for D, magna, C. dubia, P. promelas, H. azteca, and E macrochirus, respectively. These results indicate a range of sensitivities to copper exposures within and between algal and animal species. Based on the sensitivities of specific target algae at a site, the risks to nontarget species could be significant (i.e. low margin of safety).
ISSN:0146-6623