IHEM 20887
INSTITUTO DE HISTOLOGIA Y EMBRIOLOGIA DE MENDOZA DR. MARIO H. BURGOS
Unidad Ejecutora - UE
artículos
Título:
Bioindication of mercury, arsenic and uranium in the apple snail Pomacea canaliculata (Caenogastropoda, Ampullariidae): bioconcentration and symbiotic corpuscles
Autor/es:
SERGIO RIBEIRO GUEVARA; ISRAEL A. VEGA; ALEJANDRA D. CAMPOY-DIAZ; ISRAEL A. VEGA; ALEJANDRA D. CAMPOY-DIAZ; ARRIBÉRE, MARÍA; ARRIBÉRE, MARÍA; SERGIO RIBEIRO GUEVARA
Revista:
CHEMOSPHERE
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2017 p. 196 - 205
ISSN:
0045-6535
Resumen:
Pomacea canaliculata is a mollusk potentially useful as a biomonitor species of freshwater quality. Thiswork explores the ability of snail tissues and symbiotic corpuscles to bioconcentrate and depuratemercury, arsenic, and uranium. Adult snails cultured in metal-free reconstituted water were exposed foreight weeks (bioaccumulation phase) to water with Hg (2 mgL1), As (10 mgL1), and U (30 mgL1) andthen returned to the reconstituted water for other additional eight weeks (depuration phase). Elementalconcentrations in digestive gland, kidney, symbiotic corpuscles and particulate excreta were determinedby neutron activation analysis. The glandular symbiotic occupancy was measured by morphometricanalysis. After exposure, the kidney showed the highest concentration of Hg, while the digestive glandaccumulated mainly As and U. The subcellular distribution in symbiotic corpuscles was ~71%, ~48%, and~11% for U, Hg, and As, respectively. Tissue depuration between weeks 8 and 16 was variable amongstelements. At week 16, the tissue depuration of U was the highest (digestive gland ¼ 92%; kidney ¼ 80%),while it was lower for Hg (digestive gland ¼ 51%; kidney ¼ 53%). At week 16, arsenic showed a differentialpattern of tissue depuration (digestive gland ¼ 23%; kidney¼ 88%). The symbiotic detoxification ofthe three elements in excreta was fast between weeks 8 and 10 and it was slower after on. At the end ofthe depuration, each element distributed differentially in digestive gland and symbiotic corpuscles. Ourfindings show that symbiotic corpuscles, digestive gland and kidney P. canaliculata are sensitive placesfor biomonitoring of Hg, As and U.
