@article{fdi:010080533,
  title = {{S}table mercury concentrations of tropical tuna in the south western {P}acific ocean : an 18-year monitoring study},
  author = {{M}edieu, {A}. and {P}oint, {D}avid and {R}eceveur, {A}. and {G}authier, {O}. and {A}llain, {V}. and {P}ethybridge, {H}. and {M}enk{\`e}s, {C}hristophe and {G}illikin, {D}. {P}. and {R}evill, {A}. {T}. and {S}omes, {C}. {J}. and {C}ollin, {J}. and {L}orrain, {A}nne},
  editor = {},
  language = {{ENG}},
  abstract = {{G}lobal anthropogenic mercury ({H}g) emissions to the atmosphere since industrialization are widely considered to be responsible for a significant increase in surface ocean {H}g concentrations. {S}till unclear is how those inputs are converted into toxic methylmercury ({M}e{H}g) then transferred and biomagnified in oceanic food webs. {W}e used a unique long-term and continuous dataset to explore the temporal {H}g trend and variability of three tropical tuna species (yellowfin, bigeye, and skipjack) from the southwestern {P}acific {O}cean between 2001 and 2018 (n - 590). {T}emporal trends of muscle nitrogen (delta {N}-15) and carbon (delta {C}-13) stable isotope ratios, amino acid ({AA}) delta {N}-15 values and oceanographic variables were also investigated to examine the potential influence of trophic, biogeochemical and physical processes on the temporal variability of tuna {H}g concentrations. {F}or the three species, we detected significant inter-annual variability but no significant long-term trend for {H}g concentrations. {I}nter-annual variability was related to the variability in tuna sampled lengths among years and to tuna muscle delta {N}-15 and delta {C}-13 values. {C}omplementary {AA}- and model-estimated phytoplankton delta {N}-15 values suggested the influence of baseline processes with enhanced tuna {H}g concentrations observed when dinitrogen fixers prevail, possibly fuelling baseline {H}g methylation and/or {M}e{H}g bioavailability at the base of the food web. {O}ur results show that {M}e{H}g trends in top predators do not necessary capture the increasing {H}g concentrations in surface waters suspected at the global oceanic scale due to the complex and variable processes governing {H}g deposition, methylation, bioavailability and biomagnification. {T}his illustrates the need for long-term standardized monitoring programs of marine biota worldwide.},
  keywords = {{M}ethylmercury ; {S}table isotope data ; {Y}ellowfin tuna ; {B}igeye tuna ; {S}kipjack tuna ; {N}ew {C}aledonia-{F}iji region ; {PACIFIQUE} ; {NOUVELLE} {CALEDONIE} ; {FIDJI}},
  booktitle = {},
  journal = {{C}hemosphere},
  volume = {263},
  numero = {},
  pages = {128024 [14 ]},
  ISSN = {0045-6535},
  year = {2021},
  DOI = {10.1016/j.chemosphere.2020.128024},
  URL = {https://www.documentation.ird.fr/hor/fdi:010080533},
}