Effects of atrazine and nicosulfuron on freshwater microalgae

Environment International
C LeboulangerA Bérard

Abstract

Growth modifications caused by various concentrations of atrazine and nicosulfuron were monitored in closed and continuous culture of Chlorella vulgaris (chlorophyta), Navicula accommoda (diatomophyta), and Oscillatoria limnetica (cyanophyta). The concentration at which algal growth rate was reduced twofold (EC50) was determined in the three species for both herbicides. Comparatively, the two toxicants were applied at 10 microg/l level in microcosms inoculated with natural phytoplankton from Lake Geneva. The relative abundances of major phytoplanktonic species were measured by algal cell count at the beginning and at the end of each experiment. Atrazine and nicosulfuron have different targets in plant metabolism, respectively, photosystem II (PSII) and acetolactate synthase (ALS), and the expected effects were different. Generally, the cultured phytoplankton exhibited various sensitivities, depending on species or herbicide. In the microcosms, the major taxa of natural phytoplanktonic samples exhibited various patterns, from acute toxicity to growth enhancement. For example, the diatoms inside the community were not affected by atrazine and nicosulfuron, except for Stephanodiscus minutulus that was sensitive to both, and Asteri...Continue Reading

Citations

Jul 3, 2002·Water Research·Bo NyströmChristophe Leboulanger
Apr 1, 2014·Aquatic Toxicology·Paulo de MoraisM Teresa S D Vasconcelos
Oct 9, 2008·Archives of Environmental Contamination and Toxicology·Alexandrine PannardFrançoise Binet
Dec 1, 2009·Aquatic Toxicology·Chloé BonnineauSergi Sabater
Feb 28, 2016·Applied Microbiology and Biotechnology·Ánxela Fernández-NaveiraChristian Kennes
Sep 4, 2015·Environmental Science and Pollution Research International·Floriane LarrasAgnès Bouchez
Sep 17, 2014·Environmental Science and Pollution Research International·S MoissetP Gonzalez
Aug 15, 2009·Aquatic Toxicology·Carmen RiobooAngeles Cid
Jul 19, 2019·AMB Express·Ánxela Fernández-NaveiraChristian Kennes

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