@article{fdi:010084335,
  title = {{ENSO} climate forcing of the marine mercury cycle in the {P}eruvian upwelling zone does not affect methylmercury levels of marine avian top predators},
  author = {{R}enedo, {M}. and {P}oint, {D}avid and {S}onke, {J}. {E}. and {L}orrain, {A}nne and {D}emarcq, {H}erv{\'e} and {G}raco, {M}. and {G}rados, {D}. and {G}utierrez, {D}. and {M}edieu, {A}. and {M}unaron, {J}ean-{M}arie and {P}ietri, {A}. and {C}olas, {F}. and {T}remblay, {Y}ann and {R}oy, {A}m{\'e}d{\'e}e and {B}ertrand, {A}rnaud and {B}ertrand, {S}. {L}.},
  editor = {},
  language = {{ENG}},
  abstract = {{C}limate change is expected to affect marine mercury ({H}g) biogeochemistry and biomagnification. {R}ecent modeling work suggested that ocean warming increases methylmercury ({M}e{H}g) levels in fish. {H}ere, we studied the influence of {E}l {N}ino {S}outhern {O}scillations ({ENSO}) on {H}g concentrations and stable isotopes in time series of seabird blood from the {P}eruvian upwelling and oxygen minimum zone. {B}etween 2009 and 2016, {L}a {N}ina (2011) and {E}l {N}ino conditions (2015-2016) were accompanied by sea surface temperature anomalies up to 3 degrees {C}, oxycline depth change (20-100 m), and strong primary production gradients. {S}eabird {H}g levels were stable and did not co-vary significantly with oceanographic parameters, nor with anchovy biomass, the primary dietary source to seabirds (90%). {I}n contrast, seabird {D}elta {H}g-199, proxy for marine photochemical {M}e{H}g breakdown, and delta {N}-15 showed strong interannual variability (up to 0.8 and 3%, respectively) and sharply decreased during {E}l {N}ino. {W}e suggest that lower {D}elta {H}g-199 during {E}l {N}ino represents reduced {M}e{H}g photodegradation due to the deepening of the oxycline. {T}his process was balanced by equally reduced {H}g methylation due to reduced productivity, carbon export, and remineralization. {T}he non-dependence of seabird {M}e{H}g levels on strong {ENSO} variability suggests that marine predator {M}e{H}g levels may not be as sensitive to climate change as is currently thought.},
  keywords = {{H}g stable isotopes ; {MIF} ; {N}orthern {H}umboldt current system ; climate change ; ecology ; {PEROU} ; {PACIFIQUE} ; {HUMBOLDT} {COURANT}},
  booktitle = {},
  journal = {{E}nvironmental {S}cience and {T}echnology},
  volume = {55},
  numero = {23},
  pages = {15754--15765},
  ISSN = {0013-936{X}},
  year = {2021},
  DOI = {10.1021/acs.est.1c03861},
  URL = {https://www.documentation.ird.fr/hor/fdi:010084335},
}