@article{fdi:010093633,
  title = {{R}edox gradient shapes the abundance and diversity of mercury-methylating microorganisms along the water column of the {B}lack {S}ea},
  author = {{C}abrol, {L}{\'e}a and {C}apo, {E}. and {V}an {V}liet, {D}.{M}. and {B}astiaan von {M}eijenfeldt , {F}.{A}. and {B}ertilsson, {S}. and {V}illanueva, {L}. and {S}ánchez-{A}ndrea, {I}. and {B}j{\¨o}rn, {E}. and {B}ravo, {A}.{G}. and {H}eimburger {B}oavida, {L}.{E}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n the global context of seawater deoxygenation triggered by climate change and anthropogenic activities, changes in redox gradients impacting biogeochemical transformations of pollutants, such as mercury, become more likely. {B}eing the largest anoxic basin worldwide, with high concentrations of the potent neurotoxic methylmercury ({M}e{H}g), the {B}lack {S}ea is an ideal natural laboratory to provide new insights about the link between dissolved oxygen concentration and hgc{AB} gene-carrying (hgc+) microorganisms involved in the formation of {M}e{H}g. {W}e combined geochemical and microbial approaches to assess the effect of vertical redox gradients on abundance, diversity, and metabolic potential of hgc+ microorganisms in the {B}lack {S}ea water column. {T}he abundance of hgc{A} genes [congruently estimated by quantitative {PCR} (q{PCR}) and metagenomics] correlated with {M}e{H}g concentration, both maximal in the upper part of the anoxic water. {B}esides the predominant {D}esulfobacterales, hgc+ microorganisms belonged to a unique assemblage of diverse previously underappreciated anaerobic fermenters from {A}naerolineales, {P}hycisphaerae (characteristic of the anoxic and sulfidic zone), {K}iritimatiellales, and {B}acteroidales (characteristic of the suboxic zone). {T}he metabolic versatility of {D}esulfobacterota differed from strict sulfate reduction in the anoxic water to reduction of various electron acceptors in the suboxic water. {L}inking microbial activity and contaminant concentration in environmental studies is rare due to the complexity of biological pathways. {I}n this study, we disentangle the role of oxygen in shaping the distribution of {H}g-methylating microorganisms consistently with {M}e{H}g concentration, and we highlight their taxonomic and metabolic niche partitioning across redox gradients, improving the prediction of the response of marine communities to the expansion of oxygen-deficient zones.},
  keywords = {{NOIRE} {MER}},
  booktitle = {},
  journal = {m{S}ystems},
  volume = {8},
  numero = {4},
  pages = {en ligne [18 ]},
  ISSN = {2379-5077},
  year = {2023},
  DOI = {10.1128/msystems.00537-23},
  URL = {https://www.documentation.ird.fr/hor/fdi:010093633},
}