First evidence of lithium toxicity in the cryptic species complex of the estuarine copepod Eurytemora affinis.

Autor: Peignot Q; Normandie Univ, ULHN, UMR-I 02 Environmental Stress and Aquatic Biomonitoring (SEBIO), FR CNRS 3730 SCALE, Le Havre F-76600, France; Institut des Sciences de la Mer de Rimouski, Québec-Océan, Université du Québec à Rimouski, Rimouski, QC G5L 3A1, Canada. Electronic address: quentin.peignot@univ-lehavre.fr., Winkler G; Institut des Sciences de la Mer de Rimouski, Québec-Océan, Université du Québec à Rimouski, Rimouski, QC G5L 3A1, Canada. Electronic address: gesche_winkler@uqar.ca., Roy E; Institut des Sciences de la Mer de Rimouski, Québec-Océan, Université du Québec à Rimouski, Rimouski, QC G5L 3A1, Canada. Electronic address: ellia.roy@uqar.ca., Giusti N; Normandie Univ, ULHN, UMR-I 02 Environmental Stress and Aquatic Biomonitoring (SEBIO), FR CNRS 3730 SCALE, Le Havre F-76600, France. Electronic address: nathalie.giusti@univ-lehavre.fr., Forget-Leray J; Normandie Univ, ULHN, UMR-I 02 Environmental Stress and Aquatic Biomonitoring (SEBIO), FR CNRS 3730 SCALE, Le Havre F-76600, France. Electronic address: joelle.leray@univ-lehavre.fr.
Jazyk: angličtina
Zdroj: Ecotoxicology and environmental safety [Ecotoxicol Environ Saf] 2024 Sep 15; Vol. 283, pp. 116813. Date of Electronic Publication: 2024 Aug 01.
DOI: 10.1016/j.ecoenv.2024.116813
Abstrakt: The development of renewable and low-carbon energy sources means that strategic elements such as lithium (Li) are increasingly being used. The data available on the effects of Li on aquatic organisms are relatively scarce. The copepod Eurytemora affinis, widely distributed in the brackish estuarine waters of the northern hemisphere, is a species of choice in ecotoxicology but in fact constitutes a cryptic species complex, composed of at least six cryptic species. Cryptic diversity can lead to misinterpretation and alter the reproducibility of routine ecotoxicological tests. In the present study, two cryptic species of the E. affinis complex from the Seine (European clade) and the St. Lawrence (North-Atlantic clade) estuaries were used to assess Li toxicity and to compare their differential sensitivity. Larvae were exposed to different concentrations of Li (0.4, 4.39, 35.36 and 80.83 mg L -1 ) under semi-static conditions for 96 h. Larval development stages were determined and log-logistic functions were fitted to evaluate mortality (LC 50 ) and growth (EC 50 ) parameters. After 96 h of exposure, the results showed that the European and North-Atlantic clades had LC 50 values of 55.33 and 67.81 mg L -1 and EC 50 values of 28.94 and 41.45 mg L -1 , respectively. A moderate difference in sensitivity to Li between the European and North-Atlantic clades of the E. affinis complex was observed. Thus, the cryptic species diversity should be considered using E. affinis to avoid bias in the interpretation of the data. Despite environmental concentrations of Li are expected to increase over the next years, EC 50 and LC 50 found for E. affinis cryptic species are largely higher than Li environmental concentrations to provoke extreme effects.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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