Cécile Monard
University of Rennes
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Cécile Monard.
The ISME Journal | 2011
Cécile Monard; Philippe Vandenkoornhuyse; Barbara Le Bot; Françoise Binet
In soil, the way biotic parameters impact the relationship between bacterial diversity and function is still unknown. To understand these interactions better, we used RNA-based stable-isotope probing to study the diversity of active atrazine-degrading bacteria in relation to atrazine degradation and to explore the impact of earthworm-soil engineering with respect to this relationship. Bulk soil, burrow linings and earthworm casts were incubated with 13C-atrazine. The pollutant degradation was quantified by liquid chromatography–mass spectrometry for 8 days, whereas active atrazine degraders were identified at 2 and 8 days by sequencing the 16S ribosomal RNA in the 13C-RNA fractions from the three soil microsites. An original diversity of atrazine degraders was found. Earthworm soil engineering greatly modified the taxonomic composition of atrazine degraders with dominance of α-, β- and γ-proteobacteria in burrow linings and of Actinobacteria in casts. Earthworm soil bioturbation increased the γ-diversity of atrazine degraders over the soil microsites generated. Atrazine degradation was enhanced in burrow linings in which primary atrazine degraders, closely related to Pelomonas aquatica, were detected only 2 days after atrazine addition. Atrazine degradation efficiency was not linearly related to the species richness of degraders but likely relied on keystone species. By enhancing soil heterogeneity, earthworms sustained high phylogenetic bacterial diversity and exerted a biotic control on the bacterial diversity–function relationships. Our findings call for future investigations to assess the ecological significance of biotic controls on the relationships between diversity and function on ecosystem properties and services (for example, soil detoxification) at larger scales.
Molecular Ecology | 2010
Cécile Monard; Fabrice Martin-Laurent; Marion Devers-Lamrani; Oscar Lima; Philippe Vandenkoornhuyse; Françoise Binet
One of the various ecosystemic services sustained by soil is pollutant degradation mediated by adapted soil bacteria. The pathways of atrazine biodegradation have been elucidated but in situ expression of the genes involved in atrazine degradation has yet to be demonstrated in soil. Expression of the atzA and atzD genes involved in atrazine dechlorination and s‐triazine ring cleavage, respectively, was investigated during in situ degradation of atrazine in the soil drilosphere and bulked samples from two agricultural soils that differed in their ability to mineralize atrazine. Interestingly, expression of the atzA gene, although present in both soils, was not detected. Atrazine mineralization was greatest in Epoisses soil, where a larger pool of atzD mRNA was consistently measured 7 days after atrazine treatment, compared with Vezin soil (146 vs. 49 mRNA per 10 6 16S rRNA, respectively). Expression of the atzD gene varied along the degradation time course and was profoundly modified in soil bioturbated by earthworms. The atzD mRNA pool was the highest in the soil drilosphere (casts and burrow‐linings) and it was significantly different in burrow‐linings compared with bulk soil (e.g. 363 vs. 146 mRNA per 10 6 16S rRNA, 7 days after atrazine treatment in Epoisses soil). Thus, consistent differences in atrazine mineralization were demonstrated between the soil drilosphere and bulk soil. However, the impact of bioturbation on atrazine mineralization depended on soil type. Mineralization was enhanced in casts, compared with bulk soil, from Epoisses soil but in burrow‐linings from Vezin soil. This study is the first to report the effects of soil bioturbation by earthworms on s‐triazine ring cleavage and its spatial variability in soil.
Soil Biology & Biochemistry | 2008
Cécile Monard; Fabrice Martin-Laurent; C. Vecchiato; Andre-Jean Francez; Philippe Vandenkoornhuyse; Françoise Binet
Agriculture, Ecosystems & Environment | 2017
Kevin Potard; Cécile Monard; Jean-Luc Le Garrec; Jean-Pierre Caudal; Nathalie Le Bris; Françoise Binet
Agriculture, Ecosystems & Environment | 2017
Kevin Potard; Cécile Monard; Jean-Luc Le Garrec; Jean-Pierre Caudal; Nathalie Le Bris; Françoise Binet
Bageco | 2015
Kevin Potard; Cécile Monard; A Le Moigne; N Le Bris; Jean-Pierre Caudal; Jean-Luc Le Garrec; Françoise Binet
9. International Symposium on Earthworm Ecology | 2010
Cécile Monard; Philippe Vandenkoornhuyse; Fabrice Martin; Françoise Binet
ISEE8, 8th International Symposium on Earthworm Ecology | 2006
Cécile Monard; Fabrice Martin-Laurent; Philippe Vandenkoornhuyse; Françoise Binet
Colloque ‘Pesticide behaviour in soils, water and air' | 2006
Cécile Monard; Philippe Vandenkoornhuyse; Fabrice Martin-Laurent; Françoise Binet
11th International Symposium on microbial ecology (ISME 2006) | 2006
Cécile Monard; Philippe Vandenkoornhuyse; Françoise Binet