@article{fdi:010081324,
  title = {{C}oncentrations and stable isotopes of mercury in sharks of the {G}alapagos {M}arine {R}eserve : human health concerns and feeding patterns},
  author = {{M}aurice, {L}aurence and {L}e {C}roizier, {G}ael and {M}orales, {G}. and {C}arpintero, {N}. and {G}uayasamin, {J}. {M}. and {S}onke, {J}. and {P}aez-{R}osas, {D}. and {P}oint, {D}avid and {B}ustos, {W}. and {O}choa-{H}errera, {V}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he human ingestion of mercury ({H}g) from sea food is of big concern worldwide due to adverse health effects,
and more specifically if shark consumption constitutes a regular part of the human diet. {I}n this study, the total
mercury ({TH}g) concentration in muscle tissue were determined in six sympatric shark species found in a fishing
vessel seized in the {G}alapagos {M}arine {R}eserve in 2017. {T}he {TH}g concentrations in shark muscle samples (n = 73)
varied from 0.73 mg kg-1 in bigeye thresher sharks ({A}lopias superciliosus) to 8.29 mg kg-1 in silky sharks
({C}archarhinus falciformis). {A} typical pattern of {H}g bioaccumulation was observed for all shark species, with
significant correlation between {TH}g concentration and shark size for bigeye thresher sharks, pelagic thresher
sharks ({A}lopias pelagicus) and silky sharks. {R}egarding human health concerns, the {TH}g mean concentration
exceeded the maximum weekly intake fish serving in all the studied species. {M}ass-{D}ependent {F}ractionation
({MDF}, δ202{H}g values) and {M}ass-{I}ndependent {F}ractionation ({MIF}, Δ199{H}g values) of {H}g in whitetip sharks
({C}archarhinus longimanus) and silky sharks, ranged from 0.70‰ to 1.08‰, and from 1.97‰ to 2.89‰, respectively. {T}hese high values suggest that both species are feeding in the epipelagic zone (i.e. upper 200 m of the
water column). {W}hile, blue sharks ({P}rionace glauca), scalloped hammerhead sharks ({S}hyrna lewini) and thresher
sharks were characterized by lower Δ199{H}g and δ202{H}g values, indicating that these species may focus their
foraging behavior on prey of mesopelagic zone (i.e. between 200 and 1000 m depth). {I}n conclusion, the
determination of {TH}g concentration provides straight-forward evidence of the human health risks associated
with shark consumption, while mercury isotopic compositions constitute a powerful tool to trace the foraging
strategies of these marine predators.
{C}apsule: {A} double approach combining {H}g concentrations with stable isotopes ratios allowed to assess ontogeny
in common shark species in the area of the {G}alapagos {M}arine {R}eserve and the human health risks concern
associated to their consumption.},
  keywords = {{P}elagic sharks ; {M}ercury isotopes ; {F}oraging strategies ; {G}alapagos {M}arine {R}eserve ; {H}ealth risk ; {COLON} {ARCHIPIELAGO} ; {GALAPAGOS}},
  booktitle = {},
  journal = {{E}cotoxicology and {E}nvironmental {S}afety},
  volume = {215},
  numero = {},
  pages = {112122 [10 p.]},
  ISSN = {0147-6513},
  year = {2021},
  DOI = {10.1016/j.ecoenv.2021.112122},
  URL = {https://www.documentation.ird.fr/hor/fdi:010081324},
}