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Lethal and sublethal effects of the saline stressor sodium chloride on Chironomus xanthus and Girardia tigrina

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Abstract

Salinization in freshwaters is gradually increasing as a result of human activities and climatic changes. Higher salt content causes stress for freshwater organisms. Sodium chloride (NaCl) is among the most frequently occurring salts in freshwater ecosystems. The objective of the present study was to investigate the lethal and sublethal effects of NaCl on freshwater ecosystems, using as test organism the dipteran Chironomus xanthus and the planarian Girardia tigrina. Acute tests showed that C. xanthus was more sensitive (48-h LC50 (median lethal concentration) of 2.97 g NaCl L−1) than G. tigrina (48-h LC50 of 7.77 g NaCl L−1). C. xanthus larvae growth rate (larvae length and head capsule width) was significantly reduced under exposure to concentrations as low as 0.19 g L−1 NaCl and higher. A delay in the emergence time (EmT50) was also demonstrated for the same concentration. Sublethal NaCl effects in G. tigrina included feeding inhibition (LOEC (lowest observed effect concentration) of 0.4 g L−1), reduced locomotion (LOEC = 0.2 g L−1), and 24–48-h blastema regeneration (LOEC = 0.2 g L−1 and 0.1 g L−1, respectively). The results demonstrated the toxicity of NaCl to C. xanthus and G. tigrina including sublethal effects that can result in negative consequences for populations in natural freshwaters under salinization.

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Acknowledgments

This study was funded by the National Council for Scientific and Technological Development - CNPq - Brazil (Projects 401201/2014-7 and 200895/2015-0) and the Coordination of Improvement of Higher Education Personnel - CAPES, Brazil (Project PVE - A058_2013). This funding source had no involvement in the experiments, analysis of the data or manuscript preparation. RAS received scholarship from CNPq (Project 306652/2018-8). Thanks are due for the financial support to CESAM (UIDB/50017/2020+UIDP/50017/2020), to FCT/MEC through national funds. The authors also thank FCT and POPH/ FSE (Programa Operacional Potencial Humano/Fundo Social Europeu) for the research contract under the program “Investigador FCT” of JLTP (IF/01420/2015). MDB is funded by national funds (OE), through FCT – Fundação para a Ciência e a Tecnologia, I.P., in the scope of the framework contract foreseen in the numbers 4, 5, and 6 of the article 23, of the Decree-Law 57/2016, of August 29, changed by Law 57/2017, of July 19.

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Correspondence to Renato Almeida Sarmento.

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Dornelas, A.S.P., Sarmento, R.A., Cavallini, G.S. et al. Lethal and sublethal effects of the saline stressor sodium chloride on Chironomus xanthus and Girardia tigrina. Environ Sci Pollut Res 27, 34223–34233 (2020). https://doi.org/10.1007/s11356-020-09556-9

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  • DOI: https://doi.org/10.1007/s11356-020-09556-9

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