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Lethal and sublethal effects of the saline stressor sodium chloride on Chironomus xanthus and Girardia tigrina.
Dornelas, Aline Silvestre Pereira; Sarmento, Renato Almeida; Cavallini, Grasiele Soares; da Silva Barbosa, Rone; Vieira, Mayane Marques; de Souza Saraiva, Althiéris; Bordalo, Maria D; Soares, Amadeu M V M; Pestana, João L T.
Afiliação
  • Dornelas ASP; Programa de Pós-Graduação em Produção Vegetal, Universidade Federal do Tocantins, Campus de Gurupi, Gurupi, TO, 77402-970, Brazil.
  • Sarmento RA; Programa de Pós-Graduação em Produção Vegetal, Universidade Federal do Tocantins, Campus de Gurupi, Gurupi, TO, 77402-970, Brazil. rsarmento@uft.edu.br.
  • Cavallini GS; Programa de Pós-Graduação em Química, Universidade Federal do Tocantins (UFT), Campus Gurupi, Gurupi, TO, 77402-970, Brazil.
  • da Silva Barbosa R; Curso de Engenharia Florestal, Universidade Federal do Tocantins, 77410-530, Gurupi, Tocantins, Brazil.
  • Vieira MM; Curso de Química Ambiental, Universidade Federal do Tocantins, 77410-530, Gurupi, Tocantins, Brazil.
  • de Souza Saraiva A; Departamento de Agropecuaria (Conservacao de Agroecossistemas e Ecotoxicologia), Instituto Federal de Educacao, Ciência e Tecnologia Goiano - Campus Campos Belos, Campos Belos, Goias, 73840-000, Brazil.
  • Bordalo MD; CESAM & Departamento de Biologia, Universidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal.
  • Soares AMVM; Programa de Pós-Graduação em Produção Vegetal, Universidade Federal do Tocantins, Campus de Gurupi, Gurupi, TO, 77402-970, Brazil.
  • Pestana JLT; CESAM & Departamento de Biologia, Universidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal.
Environ Sci Pollut Res Int ; 27(27): 34223-34233, 2020 Sep.
Article em En | MEDLINE | ID: mdl-32557035
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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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Chironomidae Limite: Animals Idioma: En Ano de publicação: 2020 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Chironomidae Limite: Animals Idioma: En Ano de publicação: 2020 Tipo de documento: Article