title: Mercury and Selenium in Muscle and Target Organs of Scalloped Hammerhead Sharks Sphyrna lewini of the SE Gulf of California: Dietary Intake, Molar Ratios, Loads, and Human Health Risks.
abstract: Selenium and mercury were evaluated in muscle, liver, kidney, brain, and the stomach contents of juvenile scalloped hammerhead shark Sphyrna lewini. Se:Hg molar ratios were calculated. The average Hg levels in muscle ranged from 0.12 to 1.17 μg/g (wet weight); Hg was <0.39 μg/g in liver and kidneys and <0.19 μg/g in brain. The lowest value of Se was found in muscle (0.4 μg/g) and the highest in kidney (26.7 μg/g). An excess of Se over Hg was found, with Se:Hg molar ratios >1. Correlations were found for Hg in muscle with size, age, and weight, and also for Hg in liver with size, age, and weight. Hg in muscle was significantly positive correlated to Hg in brain as well as Hg in liver was correlated to Hg in kidney. The highest Hg in preys was for carangid fishes; scombrid and carangid fishes contributed with the highest Se levels. Results suggest that more than 98 % of the total Hg and 62 % of Se end up in muscle and might be affected by factors, such as geographical area, age, size, and feeding habits. The muscle of S. lewini should be consumed by people cautiously so as not to exceed the recommended intake per week.
authors.affiliation: Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Mexico, Mexico.
authors.forename: Magdalena E
authors.initials: ME
authors.lastname: Bergés-Tiznado
authors.affiliation: Facultad de Ciencias del Mar, Universidad Autónoma de Sinaloa, Paseo Claussen S/N Col. Los Pinos, C.P. 82000, Mazatlán, Sinaloa, Mexico.
authors.forename: Fernando
authors.initials: F
authors.lastname: Márquez-Farías
authors.affiliation: Facultad de Ciencias del Mar, Universidad Autónoma de Sinaloa, Paseo Claussen S/N Col. Los Pinos, C.P. 82000, Mazatlán, Sinaloa, Mexico.
authors.forename: Raúl E
authors.initials: RE
authors.lastname: Lara-Mendoza
authors.affiliation: Unidad Académica Mazatlán, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, P.O. Box 811, C.P. 82000, Mazatlán, Sinaloa, Mexico.|Instituto de Ecología, Pesquerías y Oceanografía del Golfo de México, Universidad Autónoma de Campeche (EPOMEX-UAC), Campus 6. Av. Héroe de Nacozari #480, C.P. 24029, Campeche, Campeche, Mexico.
authors.forename: Yassir E
authors.initials: YE
authors.lastname: Torres-Rojas
authors.affiliation: Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Av. IPN S/N Col. Playa de Santa Rita, C.P. 23096, La Paz, Baja California Sur, Mexico.
authors.forename: Felipe
authors.initials: F
authors.lastname: Galván-Magaña
authors.affiliation: Unidad Académica Mazatlán, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, P.O. Box 811, C.P. 82000, Mazatlán, Sinaloa, Mexico.
authors.forename: Humberto
authors.initials: H
authors.lastname: Bojórquez-Leyva
authors.affiliation: Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Mexico, Mexico. paezos@ola.icmyl.unam.mx.|Unidad Académica Mazatlán, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, P.O. Box 811, C.P. 82000, Mazatlán, Sinaloa, Mexico. paezos@ola.icmyl.unam.mx.|Miembro de El Colegio de Sinaloa, Antonio Rosales 435 Pte. Culiacán, Sinaloa, Mexico. paezos@ola.icmyl.unam.mx.
authors.forename: Federico
authors.initials: F
authors.lastname: Páez-Osuna
mesh_terms: D000818:Animals; D002140:California; D004032:Diet / Q000706:statistics & numerical data; D004784:Environmental Monitoring; D006801:Humans; D008628:Mercury / Q000378:metabolism*; D018570:Risk Assessment; D017747:Seafood / Q000706:statistics & numerical data; D012643:Selenium / Q000378:metabolism*; D012754:Sharks; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D014874:Water Pollutants, Chemical; D008628:Mercury; D012643:Selenium