Effets combinés de l'arsenic et de la stoechiométrie du milieu sur la plante aquatique Myriophyllum spicatum

Abstract : The current contamination of aquatic systems poses a lot of problems for organisms and subsequently ecosystem functioning. Our study uses Myriophyllum spicatum, an aquatic plant which produces a large quantity of polyphenols known to interfere with the growth of competitors and herbivores. In this study, plants were exposed to two concentrations of arsenate As(V) Na2HAsO4 : 0,047 and 0,468 mg/L (within the range of normal or peak environmental contamination), and three levels of N:P stoichiometry in the culture medium, namely ratios of 10:1, 25:1, and 40:1, and each combination was fivefold replicated. Morphometric (length, biomass) and physiologic (pigments, total polyphenol content, and plant stoichiometry) measures were carried out. Our results show that media stoichiometry has a significant impact on plant length and stoichiometry, and that As(V) significantly increases anthocyanin content and total polyphenols depending on medium stoichiometry. Hence, stoichiometry is important to take into account in futures studies. On the other hand, polyphenols can be used as a new good biomarker, and M. spicatum is a good test organism, which allows the quantitative estimation of the implications of the contaminants at the ecosystem scale, via the effect of polyphenols on competitors and herbivores.
Document type :
Master thesis
File URL :
http://docnum.univ-lorraine.fr/prive/BUS_M_2013_COLLET_HILLARY.pdf
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https://hal.univ-lorraine.fr/hal-01778158
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Submitted on : Wednesday, April 25, 2018 - 2:33:27 PM
Last modification on : Friday, September 14, 2018 - 1:10:26 AM

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Hillary Collet. Effets combinés de l'arsenic et de la stoechiométrie du milieu sur la plante aquatique Myriophyllum spicatum. Sciences de l'environnement. 2013. ⟨hal-01778158⟩

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