Effect of sequential isoproturon pulse exposure on Scenedesmus vacuolatus

Archives of Environmental Contamination and Toxicology
Nathalie VallottonNathalie Chèvre

Abstract

Aquatic organisms are typically exposed to fluctuating concentrations of herbicides in streams. To assess the effects on algae of repeated peak exposure to the herbicide isoproturon, we subjected the alga Scenedesmus vacuolatus to two sequential pulse exposure scenarios. Effects on growth and on the inhibition of the effective quantum yield of photosystem II (PSII) were measured. In the first scenario, algae were exposed to short, 5-h pulses at high isoproturon concentrations (400 and 1000 microg/l), each followed by a recovery period of 18 h, while the second scenario consisted of 22.5-h pulses at lower concentrations (60 and 120 microg/l), alternating with short recovery periods (1.5 h). In addition, any changes in the sensitivity of the algae to isoproturon following sequential pulses were examined by determining the growth rate-EC(50) prior to and following exposure. In both exposure scenarios, we found that algal growth and its effective quantum yield were systematically inhibited during the exposures and that these effects were reversible. Sequential pulses to isoproturon could be considered a sequence of independent events. Nevertheless, a consequence of inhibited growth during the repeated exposures is the cumulative de...Continue Reading

References

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Citations

Jan 11, 2012·Environmental Science and Pollution Research International·Lu LiangHong Yang
Dec 15, 2012·Toxicology·Hans LøkkeMartin Holmstrup
Jan 2, 2013·Ecotoxicology and Environmental Safety·Rikke T RosenkrantzK Ole Kusk
Nov 8, 2012·Journal of Hazardous Materials·Yan Fang BiHong Yang
Mar 15, 2011·The Science of the Total Environment·Ahmed TliliAgnès Bouchez
May 27, 2015·Chemosphere·Pierre-Jean Copin, Nathalie Chèvre
Dec 17, 2014·Ecotoxicology and Environmental Safety·Pierre-Jean CopinNathalie Chèvre
Apr 9, 2013·Integrated Environmental Assessment and Management·Roman Ashauer, Colin D Brown
Dec 14, 2017·Ecotoxicology·Pierre-Jean Copin, Nathalie Chèvre

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