Metal concentrations and metallothionein metal detoxification in blue sharks,Prionace glauca L. from the Western North Atlantic Ocean |
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| Affiliation: | 1. Great Lakes Institute for Environmental Research, University of Windsor, Windsor, Ontario N9B 3P4, Canada;2. KwaZulu-Natal Sharks Board, Umhlanga Rocks 4320, South Africa;3. Biomedical Resource Unit, University of KwaZulu-Natal, Durban 4000, South Africa;4. Department of Agriculture, Forestry and Fisheries, Cape Town 8012, South Africa;1. Centro Interdisciplinario de Ciencias Marinas (CICIMAR), Instituto Politécnico Nacional (IPN), Avenida IPN, s/n Colonia Playa Polo de Santa Rita, C.P. 23096, La Paz, Baja California Sur, México;2. Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo (CIIEMAD), Instituto Politécnico Nacional (IPN), Calle 30 de Junio de 1520, Barrio la Laguna Ticomán, Del. Gustavo A. Madero, C.P.07340, Distrito Federal, México;1. Department of Life Sciences, Faculty of Science and Technology, The University of the West Indies, Trinidad and Tobago;2. Department of Chemistry. Faculty of Science and Technology, The University of the West Indies, Trinidad and Tobago |
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| Abstract: | BackgroundElasmobranchs are particularly vulnerable to environmental metal contamination, accumulating these contaminants at high rates and excreting them slowly. The blue shark Prionace glauca L. is one of the most heavily fished elasmobranchs, although information regarding metal contamination and detoxification in this species is notably lacking.MethodsBlue sharks were sampled in the western North Atlantic Ocean, in offshore waters adjacent to Cape Cod, Massachusetts. Total and metallothionein-bound liver and muscle metal concentrations were determined by inductively coupled plasma mass spectrometry (ICP-MS), metallothionein detoxification and oxidative stress endpoints were determined by UV–vis spectrophotometry.ResultsMetallothionein detoxification occurred for As, Cd, Cs, Cu, Hg, Pb, Se, Ti and Zn in liver, and for As, Cd, Cs, Pb, Se, and Zn in muscle, while reduced glutathione defenses seem to be related to Co and Zn exposure.ConclusionThis is the first report for several metals (Ag, Co, non-radioactive Cs, Sb, Ti and V) for this species, which will aid in establishing baseline elemental data for biomonitoring efforts, health metrics, and conservation measures. |
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| Keywords: | Baseline elemental data Oxidative stress Metallothionein detoxification Blue shark Elasmobranch |
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