Al descargar el documento usted acepta los términos establecidos en el copyright del documento y la política de uso de la plataforma.
Biblioteca
Concentrations and stable isotopes of mercury in sharks of the Galapagos Marine Reserve: Human health concerns and feeding patterns
Monitoreo de especies
Metodologías de monitoreoThe human ingestion of mercury (Hg) 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. In this study, the total mercury (THg) concentration in muscle tissue were determined in six sympatric shark species found in a fishing vessel seized in the Galapagos Marine Reserve in 2017. The THg concentrations in shark muscle samples (n = 73) varied from 0.73 mg kg-1 in bigeye thresher sharks (Alopias superciliosus) to 8.29 mg kg-1 in silky sharks (Carcharhinus falciformis). A typical pattern of Hg bioaccumulation was observed for all shark species, with significant correlation between THg concentration and shark size for bigeye thresher sharks, pelagic thresher sharks (Alopias pelagicus) and silky sharks. Regarding human health concerns, the THg mean concentration exceeded the maximum weekly intake fish serving in all the studied species. Mass-Dependent Fractionation (MDF, δ202Hg values) and Mass-Independent Fractionation (MIF, Δ199Hg values) of Hg in whitetip sharks (Carcharhinus longimanus) and silky sharks, ranged from 0.70‰ to 1.08‰, and from 1.97‰ to 2.89‰, respectively.
These high values suggest that both species are feeding in the epipelagic zone (i.e. upper 200 m of the...
© 2021 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license
(http://creativecommons.org/licenses/by-nc-nd/4.0/).
- Categoría Blue Five: Tiburones
- Familia: Tiburones zorro Tiburones cazones Tiburones martillo
- Especies: Zorro ojón (Alopias superciliosus) Zorro pelágico (Alopias pelagicus) Tiburón jaquetón sedoso (Carcharhinus falciformis) Tiburón oceánico (Carcharhinus longimanus) Tiburón azul (Prionace glauca) Tiburón martillo común (Sphyrna lewini)
Documentos relacionados:
Vulnerability of Eastern Tropical Pacific chondrichthyan fish to climate change
El cambio climático es una emergencia medioambiental que amenaza a especies y ecosistemas en todo el mundo. Los océanos han...
Imminent risk of extirpation for two bottlenose dolphin communities in...
A long-term study of a common bottlenose dolphin (Tursiops truncatus) population inhabiting the Gulf of Guayaquil, Ecuador (2°33′...
Cranial variation between coastal and offshore bottlenose dolphins, Tursiops truncatus...
Skull shape analysis provides useful information on wildlife ecology and potential local adaptations. Common bottlenose dolphins (Tursiops truncatus)...