A species of magnetotactic deltaproteobacterium was detected at the highest abundance during an algal bloom

Pan, Hongmiao; Dong, Yuan; Teng, Zhao-Jie; Li, Jinhua; Zhang, Wenyan; Xiao, Tian; Wu, Long-Fei

doi:10.1093/femsle/fnz253

Cited by 4 publications

(3 citation statements)

References 93 publications

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“…Finally, various rods to curved rods producing bullet‐shaped magnetosomes were observed and could be tentatively affiliated to the Deltaproteobacteria since their ultrastructure was similar to described magnetotactic species of the Desulfovibrio and Desulfamplus genera (Fig. 1L–O; Lefèvre et al ., 2016; Descamps et al ., 2017; Pan et al ., 2019).…”

Section: Resultsmentioning

confidence: 99%

Mass collection of magnetotactic bacteria from the permanently stratified ferruginous Lake Pavin, France

Busigny

Mathon

Jézéquel

et al. 2021

Environmental Microbiology

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Obtaining high biomass yields of specific microorganisms for culture-independent approaches is a challenge faced by scientists studying organisms recalcitrant to laboratory conditions and culture. This difficulty is highly decreased when studying magnetotactic bacteria (MTB) since their unique behavior allows their enrichment and purification from other microorganisms present in aquatic environments. Here, we use Lake Pavin, a permanently stratified lake in the French Massif Central, as a natural laboratory to optimize collection and concentration of MTB that thrive in the water column and sediments. A method is presented to separate MTB from highly abundant abiotic magnetic particles in the sediment of this crater lake. For the water column, different sampling approaches are compared such as in situ collection using a Niskin bottle and online pumping. By monitoring several physicochemical parameters of the water column, we identify the ecological niche where MTB live. Then, by focusing our sampling at the peak of MTB abundance, we show that the online pumping system is the most efficient for fast recovering of large volumes of water at a high spatial resolution, which is necessary considering the sharp physicochemical gradients observed in the water column. Taking advantage of aerotactic and magnetic MTB properties, we present an efficient method for MTB concentration from large volumes of water. Our methodology represents a first step for further multidisciplinary investigations of the diversity, metagenomic and ecology of MTB populations in Lake Pavin and elsewhere, as well as chemical and isotopic analyses of their magnetosomes.

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Section: Resultsmentioning

confidence: 99%

Mass collection of magnetotactic bacteria from the permanently stratified ferruginous Lake Pavin, France

Busigny

Mathon

Jézéquel

et al. 2021

Environmental Microbiology

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“…To increase cell adhesion, the grids were placed on the S pole of a magnet. As the drops of water were about to dry, the grids were washed 23 times using Milli-Q water, then left to air dry at room temperature (Pan et al, 2019).…”

Section: Observations Of Mrp and Mtbmentioning

confidence: 99%

Observations on a magnetotactic bacteria-grazing ciliate in sediment from the intertidal zone of Huiquan Bay, China

et al. 2021

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Magnetotactic bacteria (MTB) are a group of prokaryotes having the ability to orient and swim along geomagnetic field lines because they contain intracellular magnetosomes, which are synthesized through a biomineralization process. Magnetosomes have recently also been found in unicellular eukaryotes, which are referred to as magnetically responsive protists (MRPs). The magnetosomes have three origins in MRPs. In this study we characterized a MTB-grazing ciliated MRP that was magnetically collected from intertidal sediment of Huiquan Bay, China. Based on 18S rRNA gene sequence analysis, the ciliated MRP was tentatively identified as Uronemella parafilificum HQ. Using transmission electron microscopy, we observed that magnetosomes having 2-3 shapes were randomly distributed within this ciliate. Energy-dispersive X-ray spectroscopy and high-resolution transmission electron microscopy images of the magnetosomes were consistent with them being composed of magnetite. Magnetosomes having the same shape and mineral composition were also detected in MTB that occurred in the same environment as the ciliated MRP. Statistical analysis showed that the size and shape of the magnetosomes in the ciliated MRP were similar to those in MTB. The results suggest that this ciliated MRP can graze, ingest, and digest various types of MTB. It is certainly worth noting that this is the first record of MRPs in Asian aquatic sediment and suggesting they might be widely distributed. These results also support the assertion that MRPs probably contribute to the ecological cycles of iron, and expand possibilities for research into the mechanism of magnetoreception in eukaryotes.

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“…Berg et al (2019) used single-cell and metagenomic analyses to show microaerobic removal of sulfide by members of the green and purple sulfur bacteria. Pan et al (2019) isolated and characterized a new magnetotactic bacterium tentatively named LR-1 from a brackish lagoon with an algal bloom. LR-1 is closely related to Desulfamplus magnetovallimortis strain BW-1 that may play a role in iron cycling and be an indicator species for monitoring algal blooms in eutrophic ecosystems.…”

Section: Bacterial Ecologymentioning

confidence: 99%

Substratum‐associated microbiota

Furey

Lee

Clemans

2020

Water Environment Research

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Highlights of new, interesting, and emerging research findings on substratum-associated microbiota covered from a survey of 2019 literature from primarily freshwaters provide insight into research trends of interest to the Water Environment Federation and others interested in benthic, aquatic environments. Coverage of topics on bottom-associated or attached algae and cyanobacteria, though not comprehensive, includes new methods, taxa new-to-science, nutrient dynamics, auto-and heterotrophic interactions, grazers, bioassessment, herbicides and other pollutants, metal contaminants, and nuisance, and bloom-forming and harmful algae. Coverage of bacteria, also not comprehensive, focuses on the ecology of benthic biofilms and microbial communities, along with the ecology of microbes like Caulobacter crescentus, Rhodobacter, and other freshwater microbial species. Bacterial topics covered also include metagenomics and metatranscriptomics, toxins and pollutants, bacterial pathogens and bacteriophages, and bacterial physiology. Readers may use this literature review to learn about or renew their interest in the recent advances and discoveries regarding substratum-associated microbiota. © 2020 Water Environment Federation • Practitioner points • This review of literature from 2019 on substratum-associated microbiota presents highlights of findings on algae, cyanobacteria, and bacteria from primarily freshwaters. • Coverage of algae and cyanobacteria includes findings on new methods, taxa new to science, nutrient dynamics, auto-and heterotrophic interactions, grazers, bioassessment, herbicides and other pollutants, metal contaminants, and nuisance, bloomforming and harmful algae. • Coverage of bacteria includes findings on ecology of benthic biofilms and microbial communities, the ecology of microbes, metagenomics and metatranscriptomics, toxins and pollutants, bacterial pathogens and bacteriophages, and bacterial physiology. • Highlights of new, noteworthy and emerging topics build on those from 2018 and will be of relevance to the Water Environment Federation and others interested in benthic, aquatic environments

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A species of magnetotactic deltaproteobacterium was detected at the highest abundance during an algal bloom

Cited by 4 publications

References 93 publications

Mass collection of magnetotactic bacteria from the permanently stratified ferruginous Lake Pavin, France

Mass collection of magnetotactic bacteria from the permanently stratified ferruginous Lake Pavin, France

Observations on a magnetotactic bacteria-grazing ciliate in sediment from the intertidal zone of Huiquan Bay, China

Substratum‐associated microbiota

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