Short term recovery of periphyton photosynthesis after pulse exposition to the photosystem II inhibitors atrazine and isoproturon | Recupération à court terme des capacités photosynthétiques du périphyton après une exposition en pulse aux inhibiteurs du PS II atrazine et isoproturon
2011
Laviale, M. | Morin, Soizic | Créach, A. | Université de Lille | Centre National de la Recherche Scientifique (CNRS) | Réseaux épuration et qualité des eaux (UR REBX) ; Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF)
[Departement_IRSTEA]Eaux [TR1_IRSTEA]BELCA
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Afficher plus [+] Moins [-]anglais. Aquatic organisms are exposed to fluctuating concentrations of herbicides which contaminate rivers following their use for agricultural or domestic purposes. The development of sensitive bioanalytical tests enabling us not only to detect the effects of those pollutants but to take into account this pattern of exposure should improve the ecological relevance of river toxicity assessment. In this respect, the use of chlorophyll fluorescence measurements is a convenient way to probe the effect of photosystem II (PSII) inhibitors on primary producers. This study was devoted to validate the combined use of two fluorescence parameters, the effective and the optimal quantum yields of PSII photochemistry (UPSII and Fv/Fm), as reliable biomarkers of initial isoproturon (IPU) or atrazine (ATZ) toxicity to natural periphyton in a pulse exposition scenario. UPSII and Fv/Fm were regularly estimated during a 7 h-exposure to each pollutant (0100 lM) and also later after being transferred in herbicide-free water (up to 36 h). Our results showed that IPU was more toxic than ATZ, but with effects reversible within 12 h. Moreover, these two similarly acting herbicides (i.e. same target site) presented contrasted short term recovery patterns, regarding the previous exposure duration.
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