@article{fdi:010073029,
  title = {{K}ey role of {A}lphaproteobacteria and {C}yanobacteria in the formation of stromatolites of lake {D}ziani {D}zaha ({M}ayotte, {W}estern {I}ndian {O}cean)},
  author = {{G}erard, {E}. and {D}e {G}oeyse, {S}. and {H}ugoni, {M}. and {A}gogue, {H}. and {R}ichard, {L}. and {M}ilesi, {V}. and {G}uyot, {F}. and {L}ecourt, {L}. and {B}orensztajn, {S}. and {J}oseph, {M}. {B}. and {L}eclerc, {T}. and {S}arazin, {G}. and {J}ezequel, {D}. and {L}eboulanger, {C}hristophe and {A}der, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{L}ake {D}ziani {D}zaha is a thalassohaline tropical crater lake located on the "{P}etite {T}erre" {I}sland of {M}ayotte ({C}omoros archipelago, {W}estern {I}ndian {O}cean). {S}tromatolites are actively growing in the shallow waters of the lake shores. {T}hese stromatolites are mainly composed of aragonite with lesser proportions of hydromagnesite, calcite, dolomite, and phyllosilicates. {T}hey are morphologically and texturally diverse ranging from tabular covered by a cauliflower-like crust to columnar ones with a smooth surface. {H}igh-throughput sequencing of bacterial and archaeal 16{S} r{RNA} genes combined with confocal laser scanning microscopy ({CLSM}) analysis revealed that the microbial composition of the mats associated with the stromatolites was clearly distinct from that of the {A}rthrospira-dominated lake water. {U}nicellular-colonial {C}yanobacteria belonging to the {X}enococcus genus of the {P}leurocapsales order were detected in the cauliflower crust mats, whereas filamentous {C}yanobacteria belonging to the {L}eptolyngbya genus were found in the smooth surface mats. {O}bservations using {CLSM}, scanning electron microscopy ({SEM}) and {R}aman spectroscopy indicated that the cauliflower texture consists of laminations of aragonite, magnesium-silicate phase and hydromagnesite. {T}he associated microbial mat, as confirmed by laser microdissection and wholegenome amplification ({WGA}), is composed of {P}leurocapsales coated by abundant filamentous and coccoid {A}lphaproteobacteria. {T}hese phototrophic {A}lphaproteobacteria promote the precipitation of aragonite in which they become incrusted. {I}n contrast, the {P}leurocapsales are not calcifying but instead accumulate silicon and magnesium in their sheaths, which may be responsible for the formation of the {M}g-silicate phase found in the cauliflower crust. {W}e therefore propose that {P}leurocapsales and {A}lphaproteobacteria are involved in the formation of two distinct mineral phases present in the cauliflower texture: {M}g-silicate and aragonite, respectively. {T}hese results point out the role of phototrophic {A}lphaproteobacteria in the formation of stromatolites, which may open new perspective for the analysis of the fossil record.},
  keywords = {stromatolites ; alkaline lake ; {P}leurocapsales ; {M}g-silicate ; {A}lphaproteobacteria ; anoxygenic phototrophic bacteria ; aragonite ; hydromagnesite ; {MAYOTTE}},
  booktitle = {},
  journal = {{F}rontiers in {M}icrobiology},
  volume = {9},
  numero = {},
  pages = {art. 796 [20 p.]},
  ISSN = {1664-302{X}},
  year = {2018},
  DOI = {10.3389/fmicb.2018.00796},
  URL = {https://www.documentation.ird.fr/hor/fdi:010073029},
}