Stranded false killer whales, Pseudorca crassidens, in Southern South America reveal potentially dangerous silver concentrations.

Autor: Cáceres-Saez I; Consejo Nacional de Investigaciones Científicas y Técnicas, Museo Argentino de Ciencias Naturales Bernardino Rivadavia, Avenida Ángel Gallardo 470, C1405DJR Buenos Aires, Argentina. Electronic address: caceres.saez@gmail.com., Haro D; Centro Bahía Lomas, Universidad Santo Tomas, Avenida Costanera 01834, Punta Arenas, Chile., Blank O; Clínica Veterinaria Timaukel y Centro de Rehabilitación de Aves Leñadura (CRAL), José Pithon 01316, Punta Arenas, Chile., Aguayo-Lobo A; Instituto Antártico Chileno (INACH), Plaza Muñoz Gamero 1055, Punta Arenas, Chile., Dougnac C; Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Av. Santa Rosa 11735, La Pintana, Santiago, Chile., Arredondo C; Tarukari, Non-Government Organization, Chile., Cappozzo HL; Consejo Nacional de Investigaciones Científicas y Técnicas, Museo Argentino de Ciencias Naturales Bernardino Rivadavia, Avenida Ángel Gallardo 470, C1405DJR Buenos Aires, Argentina., Ribeiro Guevara S; Laboratorio de Análisis por Activación Neutrónica, Centro Atómico Bariloche, Avenida Bustillo 9500, Bariloche, Argentina.
Jazyk: angličtina
Zdroj: Marine pollution bulletin [Mar Pollut Bull] 2019 Aug; Vol. 145, pp. 325-333. Date of Electronic Publication: 2019 Jun 03.
DOI: 10.1016/j.marpolbul.2019.05.047
Abstrakt: Silver (Ag) is a non-essential metal known to bioaccumulate in aquatic organisms. We determined Ag concentrations in five false killer whales stranded in South America. Silver concentrations (in dry weight basis) range as 6.62-10.78 μg g -1 in liver, 0.008-7.41 μg g -1 in spleen, 0.004-5.71 μg g -1 in testis, 0.757-1.69 μg g -1 in kidney, 0.011-0.078 μg g -1 in lung and < 0.01-0.038 μg g -1 in muscle, whereas in the single samples of uterus and ovary were 0.051 and 0.023 μg g -1 ; respectively. Overall, Ag concentration in liver and kidney exceeded the cetacean toxic thresholds, proposed as "unhealthy concentrations" and "critically dangerous" in liver and kidney. These results warrant further eco-toxicological studies, to examine biological effects of elevated silver levels for individuals and to assess the species' conservation status with respect to marine pollution.
(Copyright © 2019 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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