Assessing the response of micro-eukaryotic diversity to the Great Acceleration using lake sedimentary DNA
release_rev_2533e224-e368-451e-bace-a18f0d294887
by
François Keck, Laurent Millet, Didier Debroas, David Etienne, Didier Galop, Damien Rius, Isabelle Domaizon
2020 Volume 11, Issue 1, p3831
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.
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