@article{fdi:010082651,
  title = {{D}ecay rate of {E}scherichia coli in a mountainous tropical headwater wetland},
  author = {{N}akhle, {P}. and {B}oithias, {L}aurie and {P}ando, {A}nne and {T}hammahacksa, {C}. and {G}allion, {N}. and {S}ounyafong, {P}. and {S}ilvera, {N}orbert and {L}atsachack, {K}. and {S}oulileuth, {B}. and {R}ochelle-{N}ewall, {E}mma and {M}arcangeli, {Y}. and {P}ierret, {A}lain and {R}ibolzi, {O}livier},
  editor = {},
  language = {{ENG}},
  abstract = {{S}urface water contamination by pathogen bacteria remains a threat to public health in the rural areas of developing countries. {F}ecal indicator bacteria ({FIB}) like {E}scherichia coli ({E}. coli) are widely used to assess water contamination, but their behavior in tropical ecosystems is poorly documented. {O}ur study focused on headwater wetlands which are likely to play a key role in stream water purification of fecal pollutants. {O}ur main objectives were to: (i) evaluate decay rates (k) of the total, particle-attached and free-living {E}. coli; (ii) quantify the relative importance of solar radiation exposition and suspended particles deposition on k; and (iii) investigate {E}. coli survival in the deposited sediment. {W}e installed and monitored 12 mesocosms, 4500 m{L} each, across the main headwater wetland of the {H}ouay {P}ano catchment, northern {L}ao {P}eople's {D}emocratic {R}epublic ({L}ao {PDR}), for 8 days. {T}he four treatments with triplicates were: sediment deposition-light ({DL}); sediment deposition-dark ({DD}); sediment resuspension-light ({RL}); and sediment resuspension-dark ({RD}). {P}article-attached bacteria predominated in all mesocosms (97 +/- 6%). {D}ecay rates ranged from 1.43 +/- 0.15 to 1.17 +/- 0.13 day(-1) for {DL} and {DD} treatments, and from 0.50 +/- 0.15 to -0.14 +/- 0.37 day(-1) for {RL} and {RD} treatments. {D}eposition processes accounted for an average of 92% of {E}. coli stock reduction, while solar radiation accounted for around 2% over the experiment duration. {T}he sampling of {E}. coli by temporary resuspension of the deposited sediment showed k values close to zero, suggesting potential survival or even growth of bacteria in the sediment. {T}he present findings may help parameterizing hydrological and water quality models in a tropical context.},
  keywords = {fecal indicator bacteria ; {L}ao {PDR} ; {M}ekong basin ; water purification ; survival rates ; mesocosms ; solar radiation ; sedimentation ; particle ; deposition ; particle resuspension ; {LAOS} ; {ZONE} {TROPICALE} ; {MEKONG} {BASSIN}},
  booktitle = {},
  journal = {{W}ater},
  volume = {13},
  numero = {15},
  pages = {2068 [20 ]},
  year = {2021},
  DOI = {10.3390/w13152068},
  URL = {https://www.documentation.ird.fr/hor/fdi:010082651},
}