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Mineral formation induced by cable bacteria performing long-distance electron transport in marine sediments

Authors: Geerlings, Nicole M. J.; Zetsche, Eva-Maria; Hidalgo-Martinez, Silvia; Middelburg, Jack J.; Meysman, Filip J. R.;

Mineral formation induced by cable bacteria performing long-distance electron transport in marine sediments

Abstract

Cable bacteria are multicellular, filamentous microorganisms that are capable of transporting electrons over centimeter-scale distances. Although recently discovered, these bacteria appear to be widely present in the seafloor, and when active they exert a strong imprint on the local geochemistry. In particular, their electrogenic metabolism induces unusually strong pH excursions in aquatic sediments, which induces considerable mineral dissolution, and subsequent mineral reprecipitation. However, at present, it is unknown whether and how cable bacteria play an active or direct role in the mineral reprecipitation process. To this end we present an explorative study of the formation of sedimentary minerals in and near filamentous cable bacteria using a combined approach of electron microscopy and spectroscopic techniques. Our observations reveal the formation of polyphosphate granules within the cells and two different types of biomineral formation directly associated with multicellular filaments of these cable bacteria: (i) the attachment and incorporation of clay particles in a coating surrounding the bacteria and (ii) encrustation of the cell envelope by iron minerals. These findings suggest a complex interaction between cable bacteria and the surrounding sediment matrix, and a substantial imprint of the electrogenic metabolism on mineral diagenesis and sedimentary biogeochemical cycling. In particular, the encrustation process leaves many open questions for further research. For example, we hypothesize that the complete encrustation of filaments might create a diffusion barrier and negatively impact the metabolism of the cable bacteria.

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    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    0
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Funded by
NWO| The impact of cable bacteria on the sediment geochemistry in hypoxic systems
Project
  • Funder: Netherlands Organisation for Scientific Research (NWO) (NWO)
  • Project Code: 023.005.049
  • Funding stream: Promotiebeurs voor leraren - 2014 BOO
,
EC| BIPHA
Project
BIPHA
Bio-physical processes around marine snow aggregates
  • Funder: European Commission (EC)
  • Project Code: 660481
  • Funding stream: H2020 | MSCA-IF-EF-ST
iis
,
EC| SEDBIOGEOCHEM2.0
Project
SEDBIOGEOCHEM2.0
Hardwiring the ocean floor: the impact of microbial electrical circuitry on biogeochemical cycling in marine sediments
  • Funder: European Commission (EC)
  • Project Code: 306933
  • Funding stream: FP7 | SP2 | ERC
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