@article{fdi:010091995,
  title = {{S}argassum beaching on mangrove sediments shifts microbial and crab metabolisms and enhances blue carbon storage},
  author = {{C}hynel, {M}. and {A}bril, {G}. and {N}arayaninsamy, {M}. and {D}eirmendjian, {L}oris and {G}u{\'e}rin, {F}r{\'e}d{\'e}ric and {D}romard, {C}. and {M}eziane, {T}.},
  editor = {},
  language = {{ENG}},
  abstract = {{B}enthic metabolism and net carbon accumulation in mangroves sediments strongly depend on the quantity and quality of organic matter ({OM}) supplied, including material brought by coastal waters such as the macroalgae {S}argassum spp. {M}esocosms were used to assess the effect of eutrophication by {S}argassum on mangrove sediments. {T}he concentration of fatty acids ({FA}s), organic carbon and its carbon isotopic signature, and the sediments-air {CO}2 fluxes were used to follow the evolution of sedimentary {OM} in surface and subsurface sediments for 60 d. {S}argassum beaching shifted microbial and crab metabolism, leading to a preferential degradation of the labile fraction of {OM} from both {S}argassum (delta 13{C} = -17.7 parts per thousand and high concentration of essential {FA}s) and mangrove leaves (delta 13{C}: -28.9 parts per thousand and high concentrations of 18:2 omega 6 and 18:3 omega 3). {F}atty acids composition of crabs hepatopancreas revealed they preferentially fed on {S}argassum and these invertebrates also increased the particulate {OM} tidal export. {I}n addition, microbial activity at the sediment surface was enhanced, as revealed by strong production of branched {FA}s and higher {CO}2 fluxes in mesocosms containing {S}argassum. {H}owever, {S}argassum beaching also increased the transfer and preservation of more refractory {OM} from mangrove leaves found in higher quantity in subsurface sediments (6-8 cm) after 60 d. {I}nputs of macroalgae induced a negative priming effect and enhanced the preservation of blue carbon in the sediments. {T}his negative priming effect was enhanced by crab activities. {T}hese biotic interactions that include microbial communities apparently make mangrove efficient in storing carbon in a context of growing eutrophication of the tropical ocean.},
  keywords = {{GUADELOUPE}},
  booktitle = {},
  journal = {{L}imnology and {O}ceanography},
  volume = {69},
  numero = {12},
  pages = {2941--2953},
  ISSN = {0024-3590},
  year = {2024},
  DOI = {10.1002/lno.12725},
  URL = {https://www.documentation.ird.fr/hor/fdi:010091995},
}