@article{fdi:010074098,
  title = {{M}icronekton diel migration, community composition and trophic position within two biogeochemical provinces of the {S}outh {W}est {I}ndian {O}cean : insight from acoustics and stable isotopes},
  author = {{A}nnasawmy, {P}. and {T}ernon, {J}ean-{F}ran{\c{c}}ois and {M}arsac, {F}rancis and {C}herel, {Y}. and {B}ehagle, {N}olwenn and {R}oudaut, {G}ildas and {L}ebourges {D}haussy, {A}nne and {D}emarcq, {H}erv{\'e} and {M}oloney, {C}. {L}. and {J}aquemet, {S}. and {M}{\'e}nard, {F}r{\'e}d{\'e}ric},
  editor = {},
  language = {{ENG}},
  abstract = {{S}patial distribution, community composition and trophic roles of micronekton (crustaceans, fishes and squids) were investigated in the {I}ndian {S}outh {S}ubtropical {G}yre ({ISSG}) province and the {E}ast {A}frican {C}oastal province ({EAFR}), by combining acoustic surveys, mid-water trawls and stable isotope analyses from scientific cruises conducted in 2009 and 2010. {M}esopelagic micronekton performed diel vertical migrations in both provinces, from deep (400-740 m) to surface (0-200 m) layers at dusk and in the opposite direction at dawn, with some species migrating below 740 m. {T}he {EAFR} province was more dynamic than the oligotrophic {ISSG} province, with enhanced eddy activity and enhanced yearly productivity. {T}he active enrichment mechanisms in the {EAFR}, in terms of available primary production, led to high micronekton acoustic density (as a proxy of micronekton abundance) and large micronekton weight and abundance estimates from trawl data. {P}articulate organic matter in the {EAFR} exhibited greater enrichment in {C}-13 and {N}-15 compared to the {ISSG} and, consequently, tissues of selected micronekton organisms in the {EAFR} were more enriched in {N}-15 (higher delta {N}-15 values). {I}n both provinces, micronekton encompassed a wide range of isotopic niches, with large overlaps between species. {M}icronekton and swordfish in the {EAFR} had an overlapping range of delta {N}-15 values, contrasting with the {ISSG} province where swordfish were two trophic levels higher than the sampled micronekton. {O}ur results provide some evidence that the combined action of riverine input and the dynamics of eddies might influence productivity in the {EAFR}, and hence the abundance of micronekton and the enrichment of tissues in {N}-15, compared to the oligotrophic {ISSG} province.},
  keywords = {{M}icronekton ; {D}iel vertical migration ; {I}ndian {S}outh {S}ubtropical {G}yre ; {E}ast {A}frican {C}oastal province ; {T}rophic level ; {OCEAN} {INDIEN} {SUD} {OUEST}},
  booktitle = {},
  journal = {{D}eep-{S}ea {R}esearch {P}art {I} : {O}ceanographic {R}esearch {P}apers},
  volume = {138},
  numero = {},
  pages = {85--97},
  ISSN = {0967-0637},
  year = {2018},
  DOI = {10.1016/j.dsr.2018.07.002},
  URL = {https://www.documentation.ird.fr/hor/fdi:010074098},
}