Small freshwater ecosystems with dissimilar microbial communities exhibit similar temporal patterns

Despite small freshwater ecosystems being biodiversity reservoirs and contributing significantly to greenhouse fluxes, their microbial communities remain largely understudied. Yet, microorganisms intervene in biogeochemical cycling and impact water quality. Because of their small size, these ecosyst...

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Bibliographic Details
Published in:Molecular ecology Vol. 30; no. 9; pp. 2162 - 2177
Main Authors: David, Gwendoline M., López‐García, Purificación, Moreira, David, Alric, Benjamin, Deschamps, Philippe, Bertolino, Paola, Restoux, Gwendal, Rochelle‐Newall, Emma, Thébault, Elisa, Simon, Marianne, Jardillier, Ludwig
Format: Journal Article
Language:English
Published: England Blackwell Publishing Ltd 01.05.2021
Wiley
Subjects:
Aquatic ecosystems
Archaea
Bacteria
bacterial communities
Biodiversity
Biodiversity and Ecology
Biogeochemical cycles
Climate change
Community composition
Community structure
Composition
dynamics
Ecological monitoring
Ecology, environment
Ecosystems
Environmental conditions
Environmental Sciences
Eukaryotes
eukaryotic cells
Fluxes
France
freshwater
Freshwater ecosystems
Gene sequencing
genes
greenhouses
Life Sciences
Microbial activity
microbial eukaryotes
Microbiomes
Microorganisms
plankton
rRNA 16S
seasonal variation
Seasonal variations
surveys
Water quality
France
dynamics
plankton
freshwater
bacteria
microbial eukaryotes
archaea
ISSN:0962-1083, 1365-294X, 1365-294X
Online Access:Get full text
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Summary:Despite small freshwater ecosystems being biodiversity reservoirs and contributing significantly to greenhouse fluxes, their microbial communities remain largely understudied. Yet, microorganisms intervene in biogeochemical cycling and impact water quality. Because of their small size, these ecosystems are in principle more sensitive to disturbances, seasonal variation and pluri‐annual climate change. However, how microbial community composition varies over space and time, and whether archaeal, bacterial and microbial eukaryote communities behave similarly remain unanswered. Here, we aim to unravel the composition and intra/interannual temporal dynamic patterns for archaea, bacteria and microbial eukaryotes in a set of small freshwater ecosystems. We monitored archaeal and bacterial community composition during 24 consecutive months in four ponds and one brook from northwestern France by 16S rRNA gene amplicon sequencing (microbial eukaryotes were previously investigated for the same systems). Unexpectedly for oxic environments, bacterial Candidate Phyla Radiation (CPR) were highly diverse and locally abundant. Our results suggest that microbial community structure is mainly driven by environmental conditions acting over space (ecosystems) and time (seasons). A low proportion of operational taxonomic units (OTUs) (<1%) was shared by the five ecosystems despite their geographical proximity (2–9 km away), making microbial communities almost unique in each ecosystem and highlighting the strong selective influence of local environmental conditions. Marked and similar seasonality patterns were observed for archaea, bacteria and microbial eukaryotes in all ecosystems despite strong turnovers of rare OTUs. Over the 2‐year survey, microbial community composition varied despite relatively stable environmental parameters. This suggests that biotic associations play an important role in interannual community assembly.
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ISSN:0962-1083
1365-294X
1365-294X
DOI:10.1111/mec.15864