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| Dupraz, Valentin; Coquille, Nathalie; Menard, Dominique; Sussarellu, Rossana; Haugarreau, Larissa; Stachowski-haberkorn, Sabine. |
| A wild strain of Chaetoceros calcitrans and wild and diuron-resistant strains of Tetraselmis suecica, were exposed to the PSII inhibitor herbicides diuron and irgarol, individually and in mixtures. The effects of three concentrations of diuron and irgarol and four binary mixtures were evaluated on doubling time, relative reactive oxygen species and lipid content by flow cytometry, and on photosynthetic efficiency by pulse amplitude modulated fluorescence. In both wild strains, significant effects were observed for each molecule at the highest concentration tested: at irgarol 0.5 μg L−1, C. calcitrans was shown to be more sensitive than T. suecica (+52% and +19% in doubling time, respectively), whereas at diuron 5 μg L−1, T. suecica was more affected... |
| Tipo: Text |
Palavras-chave: Microalgae; Herbicides; Antifouling; Irgarol; Diuron; Diuron resistance. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00319/43047/42658.pdf |
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| Coquille, Nathalie; Maurer, Daniele; Auby, Isabelle; Budzinski, Helene; Stachowski-haberkorn, Sabine; Morin, Soizick; Parlanti, Edith; Vedrenne, J.; Jan, G.; Menard, Dominique; Dupraz, Valentin; Rigouin, Loic; Gouriou, Laure; D'Amico, Florence; Tournaire, Marie-pierre; Meteigner, Claire; Perriere-rumebe, Myriam; Mounguengui, A.; Tapie, Nathalie; Chevance-demars, L.; Pardon, P.; Geneste, E.. |
| Tipo: Text |
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| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00276/38740/37283.pdf |
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| Coquille, Nathalie; Menard, Dominique; Rouxel, Julien; Dupraz, Valentin; Eon, Melissa; Pardon, Patrick; Budzinski, Helene; Morin, Soizic; Parlanti, Edith; Stachowski-haberkorn, Sabine. |
| Microalgae, which are the foundation of aquatic food webs, may be the indirect target of herbicides used for agricultural and urban applications. Microalgae also interact with other compounds from their environment, such as natural dissolved organic matter (DOM), which can itself interact with herbicides. This study aimed to evaluate the influence of natural DOM on the toxicity of three herbicides (diuron, irgarol and S-metolachlor), singly and in ternary mixtures, to two marine microalgae, Chaetoceros calcitrans and Tetraselmis suecica, in monospecific, non-axenic cultures. Effects on growth, photosynthetic efficiency (Ф’M) and relative lipid content were evaluated. The chemical environment (herbicide and nutrient concentrations, dissolved organic carbon... |
| Tipo: Text |
Palavras-chave: Microalgae; Herbicides; Natural dissolved organic matter; DOM; Toxicity; Interactions. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00428/53964/55113.pdf |
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| Coquille, Nathalie; Jan, Gwilherm; Moreira, Aurelie; Morin, Soizic. |
| Many recent ecotoxicological studies suggest a relationship between freshwater contamination and increasing abundances of motile diatoms (potentially able to move). The capacity to escape would present advantages to species in polluted environments. However, actual motility as a response to toxicants had not been described and required experimental validation. We designed a specific experiment to assess how a field-isolated diatom (Gomphonema gracile) distributes energy to in situ resistance (increased population growth or photosynthesis) and escape (behavioral changes), when exposed to increasing concentrations of the herbicide metolachlor. We report here the dose-time dependent responses of G. gracile populations. They coped with low contamination by... |
| Tipo: Text |
Palavras-chave: Diatoms; Physiology; Behavior; Pesticide exposure; Motility; CASA. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00254/36521/35081.pdf |
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