FN Archimer Export Format
PT J
TI ENSO Climate Forcing of the Marine Mercury Cycle in the Peruvian Upwelling Zone Does Not Affect Methylmercury Levels of Marine Avian Top Predators
BT 
AF Renedo, Marina
   Point, David
   Sonke, Jeroen E.
   Lorrain, Anne
   Demarcq, Herve
   Graco, Michelle
   Grados, Daniel
   Gutiérrez, Dimitri
   Médieu, Anais
   Munaron, Jean-Marie
   Pietri, Alice
   Colas, François
   Tremblay, Yann
   Roy, Amedee
   Bertrand, Arnaud
   Lanco Bertrand, Sophie
AS 1:1;2:1;3:1;4:2;5:3;6:4;7:4;8:4;9:2;10:2;11:4;12:5;13:3;14:3;15:3;16:3;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:;
C1 Géosciences Environnement Toulouse (GET)-Institut de Recherche pour le Développement (IRD), CNRS, Université de Toulouse, 14 Avenue Edouard Belin, Toulouse 31400, France
   Univ Brest, CNRS, IRD, Ifremer, LEMAR, Plouzané F-29280, France
   IRD, MARBEC (Univ. Montpellier, CNRS, Ifremer, IRD), Sète 34203, France
   Instituto del Mar del Perú (IMARPE), LOCEAN IPSL (IRD/CNRS/SU/MNHN)Esquina Gamarra y General Valle, Callao 07021, Peru
   LOCEAN IPSL (IRD/CNRS/SU/MNHN), 4 Place Jussieu, Paris 75252, France
C2 IRD, FRANCE
   UBO, FRANCE
   IRD, FRANCE
   IMARPE, PERU
   IPSL, FRANCE
UM LEMAR
   MARBEC
IN WOS Cotutelle UMR
   copubli-france
   copubli-int-hors-europe
   copubli-sud
IF 11.357
TC 8
UR https://archimer.ifremer.fr/doc/00735/84742/89881.pdf
LA English
DT Article
DE ;Hg stable isotopes;MIF;Northern Humboldt current system;climate change;ecology
AB Climate change is expected to affect marine mercury (Hg) biogeochemistry and biomagnification. Recent modeling work suggested that ocean warming increases methylmercury (MeHg) levels in fish. Here, we studied the influence of El Niño Southern Oscillations (ENSO) on Hg concentrations and stable isotopes in time series of seabird blood from the Peruvian upwelling and oxygen minimum zone. Between 2009 and 2016, La Niña (2011) and El Niño conditions (2015–2016) were accompanied by sea surface temperature anomalies up to 3 °C, oxycline depth change (20–100 m), and strong primary production gradients. Seabird Hg levels were stable and did not co-vary significantly with oceanographic parameters, nor with anchovy biomass, the primary dietary source to seabirds (90%). In contrast, seabird Δ199Hg, proxy for marine photochemical MeHg breakdown, and δ15N showed strong interannual variability (up to 0.8 and 3‰, respectively) and sharply decreased during El Niño. We suggest that lower Δ199Hg during El Niño represents reduced MeHg photodegradation due to the deepening of the oxycline. This process was balanced by equally reduced Hg methylation due to reduced productivity, carbon export, and remineralization. The non-dependence of seabird MeHg levels on strong ENSO variability suggests that marine predator MeHg levels may not be as sensitive to climate change as is currently thought. 
PY 2021
PD DEC
SO Environmental Science & Technology
SN 0013-936X
PU American Chemical Society (ACS)
VL 55
IS 23
UT 000758717600021
BP 15754
EP 15765
DI 10.1021/acs.est.1c03861
ID 84742
ER

EF