Effect of low salinity on acute arsenic toxicity and bioconcentration in shrimp Litopenaeus vannamei juveniles.

Autor: Ramírez-Rochín J; Centro de Investigaciones Biológicas del Noroeste, Av. Instituto Politécnico Nacional 195, 23096 La Paz, Baja California Sur, Mexico., Campa-Córdova ÁI; Centro de Investigaciones Biológicas del Noroeste, Av. Instituto Politécnico Nacional 195, 23096 La Paz, Baja California Sur, Mexico., Frías-Espericueta MG; Facultad de Ciencias del Mar, Universidad Autónoma de Sinaloa, Paseo Claussen s/n, Mazatlán 82000, Sinaloa, Mexico., Fregoso-López MG; Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Av. Ciudad Universitaria 3000, C.P. 04510, Coyoacán, Ciudad de México, Mexico., Bojórquez-Leyva H; Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Unidad Académica Mazatlán, Joel Montes Camarena s/n, Mazatlán 82040, Sinaloa, Mexico., Páez-Osuna F; Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Unidad Académica Mazatlán, Joel Montes Camarena s/n, Mazatlán 82040, Sinaloa, Mexico; El Colegio de Sinaloa, Centro, Culiacán, Sinaloa, Mexico. Electronic address: paezos@ola.icmyl.unam.mx.
Jazyk: angličtina
Zdroj: Comparative biochemistry and physiology. Toxicology & pharmacology : CBP [Comp Biochem Physiol C Toxicol Pharmacol] 2019 Apr; Vol. 218, pp. 1-7. Date of Electronic Publication: 2018 Dec 04.
DOI: 10.1016/j.cbpc.2018.12.005
Abstrakt: This study investigated acute arsenic toxicity and bioconcentration capacity in Litopenaeus vannamei because it has been frequently exposed to lower salinities than its isosmotic point (25 g L -1 ). Juveniles (9.9 ± 0.4 g) were exposed to low (5-10 g L -1 ) and isosmotic salinity (25 g L -1 ) levels; As values were 30.8, 20.2, 16.8 and 13.9 mg L -1 at 5 g L -1 ; 30.4, 19.1, 16.8 and 14.8 mg L -1 at 10 g L -1 ; 31.5, 19.0, 15.0 and 11.9 mg L -1 at 25 g L -1 at 24, 48, 72 and 96 h LC 50 , respectively. No significant differences were found among As LC 50 values calculated for different salinity levels and same exposure times, concluding that low salinity did not affect shrimp sensitivity to As. Likewise, no significant differences were observed in As bioconcentration in shrimp exposed to the same waterborne As and distinct salinity, supporting the results of acute toxicity. Bioconcentration factors of As maintained a relatively stable tendency where all values (0.8 ± 0.2 to 1.7 ± 0.4) were statistically comparable to 1, indicating that As was accumulated in a similar proportion to waterborne As concentration at three salinity levels. This study proposed 135.3 ± 12.1 μg L -1 for salinities from 5 to 25 g L -1 as provisional safe As concentration. According to these results, the hypothesis that sustains an effect of low salinity on As acute toxicity and its bioconcentration capacity cannot be acceptable. Therefore, the information provided allows knowing the threshold levels of As in water to avoid ecological and economic losses.
(Copyright © 2018 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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