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24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018




Centre Alpin sur les Réseaux Trophiques et Ecosystèmes Lacustre

A study on the sedimentary DNA of micro-eukaryotes in lakes reveals human influences on lake community composition in the Anthropocene

in Nature Communications, with Isabelle Domaizon & François Keck, UMR CARRTEL, INRAE, USMB, pôle ECLA

microorganisms in lakes heavily impacted for a century
Abstract : Long-term time series have provided evidence that anthropogenic pressures can threaten lakes. Yet it remains unclear how and the extent to which lake biodiversity has changed during the Anthropocene, in particular for microbes. Here, we used DNA preserved in sediments to compare modern micro-eukaryotic communities with those from the end of the 19th century, i.e., before acceleration of the human imprint on ecosystems. Our results obtained for 48 lakes indicate drastic changes in the composition of microbial communities, coupled with a homogenization of their diversity between lakes. Remote high elevation lakes were globally less impacted than lowland lakes affected by local human activity. All functional groups (micro-algae, parasites, saprotrophs and consumers) underwent significant changes in diversity. However, we show that the effects of anthropogenic changes have benefited in particular phototrophic and mixotrophic species, which is consistent with the hypothesis of a global increase of primary productivity in lakes.
Bourget lake I Domaizon 2019_2


Keck F, Millet L, Debroas D, Etienne D, Galop D, Rius D, Domaizon I., Assessing the response of micro-eukaryotic diversity to the Great Acceleration using lake sedimentary DNA, Nature Communications NCOMMS-20-07936, 31 juillet 2020 DOI : 10.1038\s41467-020-17682-8

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