Euxinic Freshwater Hypolimnia Promote Bacterial Endemicity in Continental Areas

  title={Euxinic Freshwater Hypolimnia Promote Bacterial Endemicity in Continental Areas},
  author={Albert Barber{\'a}n and Emilio O. Casamayor},
  journal={Microbial Ecology},
Bacteria and archaea represent the vast majority of biodiversity on Earth. The ways that dynamic ecological and evolutionary processes interact in the microbial world are, however, poorly known. Here, we have explored community patterns of planktonic freshwater bacteria inhabiting stratified lakes with oxic/anoxic interfaces and euxinic (anoxic and sulfurous) water masses. The interface separates a well-oxygenated upper water mass (epilimnion) from a lower anoxic water compartment (hypolimnion… 

Contrasting taxonomic stratification of microbial communities in two hypersaline meromictic lakes

The analyses showed that the lakes harbored multiple and diverse prokaryotic communities whose distribution mirrored the water stratification patterns and indicated the presence of a yet-undescribed methanogenic group in the lakes’ hypersaline monimolimnion.

Bacterial Communities of Three Saline Meromictic Lakes in Central Asia

In conclusion, based on highly variable bacterial composition in water layers or lakes, it is inferred that the meromictic ecosystem was characterized by high diversity and heterogenous niches.

Distribution and identity of bacteria in subarctic permafrost thaw ponds.

The separation of surface waters of different ponds showed that bacterial communities could differ between superficially similar environments, and thus, the potentially complex response of thaw pond systems to climate change.

Heterogeneous vertical structure of the bacterioplankton community in a non-stratified Antarctic lake

A strong influence of external factors on the microbial ecology of this model Antarctic lake illustrates the existence of this biological heterogeneity through the water column, although the lake does not show physical-chemical stratification in summer.

Surprising Prokaryotic and Eukaryotic Diversity, Community Structure and Biogeography of Ethiopian Soda Lakes

A surprisingly high biodiversity in all of the studied lakes, similar to that of freshwater lakes, is revealed, Interestingly, diversity appeared uncorrelated or positively correlated to pH and salinity, with the most “extreme” lakes showing the highest richness.

Microbial diversity under extreme euxinia: Mahoney Lake, Canada

Distributions of 16S rRNA genes are profiled using gene clone libraries and PhyloChip microarrays to suggest zonation of sulfur cycle processes in this stratified system of Mahoney Lake.

Biogeography of bacterial communities exposed to progressive long-term environmental change

The response of microbial communities to long-term environmental change is poorly understood. Here, we study bacterioplankton communities in a unique system of coastal Antarctic lakes that were

Microbial biodiversity in saline shallow lakes of the Monegros Desert, Spain.

Bacteria, archaea, and microbial eukaryotes from 11 saline lakes in winter and spring were analyzed by rRNA gene fingerprinting and sequencing covering large salinity and temperature ranges, finding the highest ecological diversity (Shannon-Weaver index) was found in protists and the lowest in Archaea.

Distinct and diverse anaerobic bacterial communities in boreal lakes dominated by candidate division OD1

Stable isotope data and taxonomic classification point to methane oxidation and autotrophic denitrification as important processes in the suboxic zone of boreal lakes.

Towards a Microbial Conservation Perspective in High Mountain Lakes

Microorganisms are fundamental components to maintain the ecological integrity of any ecosystem. Microscopic organisms have been, however, mostly excluded in conservation studies and microbiology has




A consistent positive association is found between bacterial OTU richness and lake area and the slope of this relationship was similar to slopes obtained for organisms with high dispersion rates.

An endangered oasis of aquatic microbial biodiversity in the Chihuahuan desert.

Water samples and geological data suggest that the aquatic ecosystems of Cuatro Cienegas are hydrologically interconnected with adjacent valleys recently targeted for agricultural intensification, and underscore the conservation value of desert aquatic ecosystems and the urgent need for study and preservation of freshwater microbial communities.


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Clone library analysis reveals an unusual composition and strong habitat partitioning of pelagic bacterial communities in Lake Tanganyika

The phylogenetic composition of bacterioplankton communities in Lake Tanganyika was studied by sequencing 16S rRNA gene clones and found few representatives of the Actino- bacteria, Bacteroidetes, Cyanobacteria, and Alpha- and Betaproteobacteria commonly found in freshwater environments in temperate and cold regions, but observed a remarkably high number of clones belonging to Chloroflexi and Gammaproteinobacteria.

High archaeal richness in the water column of a freshwater sulfurous karstic lake along an interannual study.

The largest fraction of phylotypes from the two archaeal kingdoms was retrieved from the anoxic hypolimnion, indicating that these cold and sulfide-rich waters constitute an unexplored source of Archaeal richness.

Unusual bacterioplankton community structure in ultra‐oligotrophic Crater Lake

Comparison of Crater Lake to other lakes studied by rRNA methods suggests that selective factors structuringCrater Lake bacterioplankton populations may include low concentrations of available trace metals and dissolved organic matter, chemistry of infiltrating hydrothermal waters, and irradiation by high levels of ultraviolet light.

Depth Distribution of Microbial Diversity in Mono Lake, a Meromictic Soda Lake in California

Elevated diversity in anoxic bottom water samples relative to oxic surface water samples suggests a greater opportunity for niche differentiation in bottom versus surface waters of this lake.

Global phylogenetic community structure and β-diversity patterns in surface bacterioplankton metacommunities

Overall, the analyses indicated differ- ences among phylogenetic groups and reflected pat- terns upon which further exploration of community assembly theory could be based.

Global ecological patterns in uncultured Archaea

A global analytical approach to uncultured Archaea that for the first time reveals well-defined community patterns along broad environmental gradients and habitat types provided ecological support for the often arbitrary nomenclature within unculturing Archaea, as well as phylogeographical clues on key ecological and evolutionary aspects of archaeal biology.

Viability and potential for immigration of airborne bacteria from Africa that reach high mountain lakes in Europe.

Generation of atmospheric aerosols and remote dust deposition is a global process, largely enhanced by perturbations linked to the global change, and high mountain lakes are very convenient worldwide model systems for monitoring global-scale bacterial dispersion and pathogens entries in remote pristine environments.