@article{fdi:010083895,
  title = {{D}o microbial planktonic communities reflect the ecological changes of {G}lorieuses coral reefs ({I}les {E}parses, {W}estern {I}ndian {O}cean) ?},
  author = {{B}ouvy, {M}arc and {B}elieres, {A}. and {C}arr{\'e}, {C}laire and {G}ot, {P}. and {P}agano, {M}arc and {A}gogue, {H}. and {B}ec, {B}. and {R}oques, {C}. and {B}igot, {L}. and {C}habanet, {P}ascale and {D}upuy, {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{E}cological baselines for the structure and functioning of ecosystems in the absence of human activity can provide essential information on their health status. {T}he {G}lorieuses islands are located in the {W}estern {I}ndian {O}cean ({WIO}) and can be considered as "pristine" ecosystems that have not been subjected to anthropogenic pressure. {T}heir nutrient context and the microbial assemblages were assessed by determining the abundance of heterotrophic prokaryotes (archaea and bacteria), picocyanobacteria, picoeukaryotes, microphytoplankton and protozooplankton communities in five stations, during two contrasted periods ({N}ovember 2015 and {M}ay 2016). {C}hlorophyll-a concentrations were always under 1 mu g/{L} and associated to very low levels in orthophosphates, nitrate and dissolved organic carbon, revealing an ultra-oligotrophic status for the {G}lorieuses waters. {P}icocyanobacteria confirmed the ultra-oligotrophic status with a predominance of {S}ynechococcus. {Z}eaxanthin associated with the presence of picocyanobacteria represented the major pigment in both surveys. {T}hree indices of diversity (species richness, {S}hannon and {P}ielou indexes) from microscopy observations highlighted the difference of diversity in microphytoplankton between the surveys. {A} focus on a 16{S} metabarcoding approach showed a high dominance of picocyanobacteria, {A}lpha- and {G}ammaproteobacteria, regardless of station or period. {M}ultivariate analyses (co-inertia analyses) revealed a strong variability of ecological conditions between the two periods, with (i) high nutrient concentrations and heterotrophic nanoflagellate abundance in {N}ovember 2015, and (ii) high heterotrophic prokaryote and picoeukaryote abundance in {M}ay 2016. {T}he impact of a category 5 tropical cyclone ({F}antala) on the regional zone in {A}pril 2016 is also advanced to explain these contrasted situations. {R}elative importance of top-down factors between bacterial and heterotrophic nanoflagellates was observed in {N}ovember 2015 with an active microbial food web. {A}ll the results indicate that three microbial indexes potentially can be considered to assess the ecological change in {G}lorieuses marine waters.},
  keywords = {{P}lankton ; {M}icroorganisms ; {E}cological changes ; {C}yclone ; {P}ristine ecosystem ; {I}ndian {O}cean ; {OCEAN} {INDIEN} ; {GLORIEUSES} {ARCHIPEL} ; {EPARSES} {ILES}},
  booktitle = {},
  journal = {{M}arine {P}ollution {B}ulletin},
  volume = {174},
  numero = {},
  pages = {113218 [17 ]},
  ISSN = {0025-326{X}},
  year = {2022},
  DOI = {10.1016/j.marpolbul.2021.113218},
  URL = {https://www.documentation.ird.fr/hor/fdi:010083895},
}