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Toxicity of Epoxiconazole to the Marine Diatom Chaetoceros calcitrans: Influence of Growth Conditions and Algal Development Stage
2013
Amara, Anis | Quiniou, Francoise | Durand, Gael | El Bour, Monia | Boudabous, Abdellatif | Hourmant, Annick
The triazole fungicide epoxiconazole is extensively used to control fungi on crops and may present some potential risk from runoff on coastal ecosystems located close to agricultural areas. Phytotoxicity assessments were conducted on the marine diatom Chaetoceros calcitrans using both the active ingredient and its formulated product (Opus). The 3-day EC50 using cell count was 2.31 mg/L for epoxiconazole active ingredient and 2.9 mu g/L for epoxiconazole-formulated. The fungicide produced an increase of cellular volume, pigment (chlorophylls a, c, and carotenoids) content, ATP synthesis, and rates of photosynthesis and respiration. Progressive algal cell recovery from epoxiconazole effects occurred after 3 days, with the increasing cell density. Differences in cell age, light, and nutrient composition induced changes in epoxiconazole sensitivity. Since these parameters affect cellular division rates, the cellular density is an important parameter in toxicity tests.
Show more [+] Less [-]Biochemical assessment of cellular energy allocation in Daphnia magna exposed to toxic stress as an alternative to the conventionnal "Scope for growth" methodology
1995
De Coen, W.M. (University of Ghent (Belgique). Laboratory of Biological Research in Aquatic Pollution) | Janssen, C.R. | Persoone, G.
Polysaccharide and xenobiotic-metabolizing enzymes as biomarkers of contamination of Lymnaea palustris (Mollusca, Gastropoda) by atrazine and hexachlorobenzene in freshwater mesocoms
1995
Baturo, W. (Universite de Paris 11, Orsay (France). Laboratoire d'Ecologie et de Zoologie) | Lagadic, L. | Caquet, T.
