0000000000464321
AUTHOR
Christelle Margoum
Utilisation des mécanismes d'adaptation microbienne pour caractériser les conséquences écologiques de l'interdiction d'utilisation du diuron en zone viticole
National audience
Array of microbial indicators, a promise for a better monitoring of pesticide effects on stream biological quality
Visioconférence; National audience; Freshwater contamination by pesticide residues is a major and growing threat to aquatic communities, ecosystem functioning and ultimately human health worldwide. Typical pesticide contamination in agricultural landscapes is characterized by a cocktail of a large number of active compounds and their main transformation products, each of them found at very low and temporally fluctuating concentrations. This makes the quantification of pesticide residues in streams highly challenging and costly by means of grab chemical sampling. Accordingly, it makes also difficult to characterize the chronic exposure of aquatic communities in pesticide-contaminated streams…
Adaptation des communautés microbiennes autotrophes et hétérotrophes aux changements spatio-temporels d'exposition aux pesticides en cours d'eau
National audience
Freshwater sediment pesticide biodegradation potential as an ecological indicator of microbial recovery following a decrease in chronic pesticide exposure
International audience; Water resources and aquatic ecosystems are an essential concern of any policy for sustainable development. In the context of the European Water Framework Directive, which aims to achieve good chemical and ecological status of waters, the herbicide diuron was banned in France in December 2008. In lotic ecosystems, benthic microbial assemblages are considered as useful potential indicators of ecological status because they integrate the effects of multiple anthropogenic disturbances and have strong capacities to adapt to novel environmental conditions. Field studies have thus revealed that in situ diuron exposure can induce microbial adaptation leading to an increase i…
Development and dissemination to operational stakeholders of integrative tools for chemical and biological measurements in watercourses to monitor the impact of pesticides according to agricultural practices and their evolution
The results of the Impact-CE project highlight the specific contribution of various integrative tools to have a more complete vision of the chemical and biological impact of pesticides on watercourses. In addition to grabe sampling, which gives a quantitative and instantaneous view of contamination, these tools provide more representative information over time, which makes them better tools for prioritising basins that contribute to contamination. They are also more robust for reporting interannual changes in agricultural practices, even if it may remain difficult to dissociate the effect of limited changes in practices from that of significant climatic variations. The results also confirm …