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Resumen del producto

Pantoja-Echevarría, L.M., A.J., Marmolejo-Rodríguez, F., Galván-Magaña, F.R., Elorriaga-Verplancken, A., Tripp-Valdez, E., Tamburin, A., Lara, M.P., Jonathan, S.B., Sujitha, A., Delgado-Huertas & L., Arreola-Mendoza (2023). Trophic structure and biomagnification of cadmium, mercury and selenium in brown smooth hound shark (Mustelus henlei) within a trophic web. Food webs. 34(e00263): 8. DOI: 10.1016/j.fooweb.2022.e00263.

Trophic structure and biomagnification of cadmium, mercury and selenium in brown smooth hound shark (Mustelus henlei) within a trophic web

Laura María Pantoja-Echevarría 1, Ana Judith Marmolejo-Rodríguez 2, Felipe Galván-Magaña 2, Fernando R. Elorriaga-Verplancken 2, Arturo Tripp-Valdez 2, Elena Tamburin 3, Ariagna Lara 2, M. P. Jonathan 4, S. B. Sujitha 5, Antonio Delgado-Huertas 6 y Laura Arreola-Mendoza 2

1 Universidad de Granada
2 Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Departamento de pesquerías
3 Fundacion Alium Pacific
4 Instituto Politécnico Nacional, Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo
5 Instituto Politécnico Nacional, Escuela Superior de Ingeniería y Arquitectura
6 Instituto Andaluz de Ciencias de la Tierra IACT (CSIC-UGR)

Stable isotopic values of carbon (d13C) and nitrogen (d15N) were used to characterize the trophic structure and biomagnification of Cadmium (Cd), Mercury (Hg) and Selenium (Se) in a trophic web of 18 taxa namely zooplankton, crustaceans, mollusks, fishes, and Mustelus henlei shark collected off the western coast of Baja California Sur, Mexico. Isotopic results indicated interspecies variations in the trophic web structure with mean d 13C values of – 20.0‰ (zooplankton) < - 18.2 ‰ (M. henlei) < - 14.1 ‰ (Thaisella kiosquiformis, mollusk). In general, d15N and d13C values increased from primary consumers (zooplankton) to predators, following the isotopic patterns of other trophic webs. The concentrations of Cd, Hg and Se were relatively less in most of the organisms except mollusks that presented high concentrations of Cd. The biomagnification factors of the trophic web showed biodilution of Cd (Food Web Magnification Factor, FWMFCd = 0.2), biomagnification of Hg (FWMFHg = 3.34) and Se (FWMFSe = 1.45) respectively. However, the concentrations of Se did not increase consistently from the lower trophic levels to the higher ones. This study documents the dynamics of a marine trophic structure and demonstrates that biodilution/biomagnification processes of metal contaminants are largely species specific and are closely related to physical - chemical and food web structure.

Palabras clave: Biodilution; Biomagnification; Trace elements; trophic web; Baja California Sur

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