Assessing the response of micro-eukaryotic diversity to the Great Acceleration using lake sedimentary DNA

François Keck, Laurent Millet, Didier Debroas, David Etienne, Didier Galop, Damien Rius and Isabelle Domaizon ()
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François Keck: INRAE, Université Savoie Mont Blanc, CARRTEL
Laurent Millet: CNRS, Chrono Environnement
Didier Debroas: Université Clermont Auvergne, CNRS, Laboratoire Microorganismes: Genome et Environnement
David Etienne: Pole R&D ECLA, CARRTEL
Didier Galop: GEODE UMR 5602 CNRS, Université de Toulouse
Damien Rius: CNRS, Chrono Environnement
Isabelle Domaizon: INRAE, Université Savoie Mont Blanc, CARRTEL

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-17682-8

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