@article{fdi:010074019,
  title = {{L}inking microbial activities and low-molecular-weight thiols to hg methylation in biofilms and periphyton from high-altitude tropical lakes in the {B}olivian altiplano},
  author = {{B}ouchet, {S}. and {G}oni-{U}rriza, {M}. and {M}onperrus, {M}. and {G}uyoneaud, {R}. and {F}ernandez, {P}. and {H}eredia, {C}. and {T}essier, {E}. and {G}assie, {C}. and {P}oint, {D}avid and {G}u{\'e}dron, {S}t{\'e}phane and {A}cha, {D}. and {A}mouroux, {D}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he sources and factors controlling concentrations of monomethylmercury ({MMH}g) in aquatic ecosystems need to be better understood. {H}ere, we investigated {H}g transformations in sediments, periphyton associated with green algae's or aquatic plants, and benthic biofilms from the {L}ake {T}iticaca hydrosystem and compared them to the occurrence of active methylating microorganisms and extracellular {H}g ligands. {I}ntense {H}g methylation was found in benthic biofilms and green algae's periphyton, while it remained low in sediments and aquatic plants' periphyton. {D}emethylation varied between compartments but remained overall in the same range. {H}g methylation was mainly carried out by sulfate reducers, although methanogens also played a role. {I}ts variability between compartments was first explained by the presence or absence of the hgc{AB} genes. {N}ext, both benthic biofilm and green algae's periphyton exhibited a great diversity of extracellular low-molecular-weight ({LMW}) thiols (13 or 14 compounds) present at a range of a few nmol {L}-1 or mu mol {L}-1 but clearly dominated by cysteine and 3-mercaptopropionic acid. {H}g methylation was overall positively correlated to the total thiol concentrations, albeit to different extents according to the compartment and conditions. {T}his work is the first examining the interplay between active methylating bacterial communities and extracellular ligands in heterotrophic biofilms and supports the involvement of {LMW} thiols in {H}g methylation in real aquatic systems.},
  keywords = {{BOLIVIE} ; {TITICACA} {LAC} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{E}nvironmental {S}cience and {T}echnology},
  volume = {52},
  numero = {17},
  pages = {9758--9767},
  ISSN = {0013-936{X}},
  year = {2018},
  DOI = {10.1021/acs.est.8b01885},
  URL = {https://www.documentation.ird.fr/hor/fdi:010074019},
}