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Foraging plasticity diversifies mercury exposure sources and bioaccumulation patterns in the world's largest predatory fish.
Le Croizier, Gaël; Sonke, Jeroen E; Lorrain, Anne; Renedo, Marina; Hoyos-Padilla, Mauricio; Santana-Morales, Omar; Meyer, Lauren; Huveneers, Charlie; Butcher, Paul; Amezcua-Martinez, Felipe; Point, David.
Afiliación
  • Le Croizier G; UMR Géosciences Environnement Toulouse (GET), Observatoire Midi Pyrénées (OMP), 14 avenue Edouard Belin, 31400 Toulouse, France; Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Av. Joel Montes Camarena S/N, Mazatlán, Sin 82040, Mexico. Electronic address: gael.le
  • Sonke JE; UMR Géosciences Environnement Toulouse (GET), Observatoire Midi Pyrénées (OMP), 14 avenue Edouard Belin, 31400 Toulouse, France.
  • Lorrain A; Univ Brest, CNRS, IRD, Ifremer, LEMAR, F-29280 Plouzané, France.
  • Renedo M; UMR Géosciences Environnement Toulouse (GET), Observatoire Midi Pyrénées (OMP), 14 avenue Edouard Belin, 31400 Toulouse, France.
  • Hoyos-Padilla M; Pelagios-Kakunjá A.C, Sinaloa 1540, Col. Las Garzas, C.P. 23070 La Paz, B.C.S., Mexico; Fins Attached: Marine Research and Conservation, 19675 Still Glen Drive, Colorado Springs, CO 80908, USA.
  • Santana-Morales O; ECOCIMATI A.C., 22800 Ensenada, Baja California, Mexico.
  • Meyer L; Southern Shark Ecology Group, College of Science and Engineering, Flinders University, Adelaide, SA 5042, Australia; Georgia Aquarium, Atlanta, GA 30313, USA.
  • Huveneers C; Southern Shark Ecology Group, College of Science and Engineering, Flinders University, Adelaide, SA 5042, Australia.
  • Butcher P; NSW Department of Primary Industries, National Marine Science Centre, Coffs Harbour, NSW 2450, Australia.
  • Amezcua-Martinez F; Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Av. Joel Montes Camarena S/N, Mazatlán, Sin 82040, Mexico.
  • Point D; UMR Géosciences Environnement Toulouse (GET), Observatoire Midi Pyrénées (OMP), 14 avenue Edouard Belin, 31400 Toulouse, France.
J Hazard Mater ; 425: 127956, 2022 03 05.
Article en En | MEDLINE | ID: mdl-34986563
Large marine predators exhibit high concentrations of mercury (Hg) as neurotoxic methylmercury, and the potential impacts of global change on Hg contamination in these species remain highly debated. Current contaminant model predictions do not account for intraspecific variability in Hg exposure and may fail to reflect the diversity of future Hg levels among conspecific populations or individuals, especially for top predators displaying a wide range of ecological traits. Here, we used Hg isotopic compositions to show that Hg exposure sources varied significantly between and within three populations of white sharks (Carcharodon carcharias) with contrasting ecology: the north-eastern Pacific, eastern Australasian, and south-western Australasian populations. Through Δ200Hg signatures in shark tissues, we found that atmospheric Hg deposition pathways to the marine environment differed between coastal and offshore habitats. Discrepancies in δ202Hg and Δ199Hg signatures among white sharks provided evidence for intraspecific exposure to distinct sources of marine methylmercury, attributed to population and ontogenetic shifts in foraging habitat and prey composition. We finally observed a strong divergence in Hg accumulation rates between populations, leading to three times higher Hg concentrations in large Australasian sharks compared to north-eastern Pacific sharks, and likely due to different trophic strategies adopted by adult sharks across populations. This study illustrates the variety of Hg exposure sources and bioaccumulation patterns that can be found within a single species and suggests that intraspecific variability needs to be considered when assessing future trajectories of Hg levels in marine predators.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Tiburones / Mercurio Tipo de estudio: Prognostic_studies Límite: Animals / Humans Idioma: En Revista: J Hazard Mater Asunto de la revista: SAUDE AMBIENTAL Año: 2022 Tipo del documento: Article Pais de publicación: Países Bajos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Tiburones / Mercurio Tipo de estudio: Prognostic_studies Límite: Animals / Humans Idioma: En Revista: J Hazard Mater Asunto de la revista: SAUDE AMBIENTAL Año: 2022 Tipo del documento: Article Pais de publicación: Países Bajos