Homogenization of lake cyanobacterial communities over a century of climate change and eutrophication

Nature Ecology & Evolution
Marie-Eve MonchampFrancesco Pomati

Abstract

Human impacts on biodiversity are well recognized, but uncertainties remain regarding patterns of diversity change at different spatial and temporal scales. Changes in microbial assemblages are, in particular, not well understood, partly due to the lack of community composition data over relevant scales of space and time. Here, we investigate biodiversity patterns in cyanobacterial assemblages over one century of eutrophication and climate change by sequencing DNA preserved in the sediments of ten European peri-Alpine lakes. We found species losses and gains at the lake scale, while species richness increased at the regional scale over approximately the past 100 years. Our data show a clear signal for beta diversity loss, with the composition and phylogenetic structure of assemblages becoming more similar across sites in the most recent decades, as have the general environmental conditions in and around the lakes. We attribute patterns of change in community composition to raised temperatures affecting the strength of the thermal stratification and, as a consequence, nutrient fluctuations, which favoured cyanobacterial taxa able to regulate buoyancy. Our results reinforce previous reports of human-induced homogenization of natu...Continue Reading

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Citations

Apr 9, 2020·Communications Biology·Marianne EllegaardN John Anderson
Apr 17, 2019·Oecologia·Michael F ChislockAlan E Wilson
Jan 30, 2019·Frontiers in Microbiology·Marie-Eve MonchampFrancesco Pomati
Oct 10, 2020·Scientific Reports·Katharina FrindteClaudia Knief
Feb 16, 2021·Environmental Science & Technology·Hanxiao ZhangFengchang Wu
Sep 10, 2021·Molecular Ecology·Jan PawlowskiFlorian Altermatt

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Datasets Mentioned

BETA
PRJEB21329

Methods Mentioned

BETA
PCR
PCRs

Software Mentioned

CIMminer
lme4
UPARSE
PyNAST
phyloseq
vegan
Bioconductor
FastTree
R
pbkrtest

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