Arsenic toxicity to cladocerans isolated and associated with iron: implications for aquatic environments

Abstract

Arsenic is an ametal ubiquitous in nature and known by its high toxicity. Many studies have tried to elucidate the arsenic metabolism in the cell and its impact to plants, animals and human health. In aqueous phase, inorganic arsenic is more common and its oxidation state (As III and As V) depends on physical and chemical environmental conditions. The aim of this study was to evaluate toxicity of arsenic to Daphnia similis and Ceriodaphnia silvestrii, isolated and associated with iron. The results showed differences in toxicity of As III and As V to both species. Effective concentration (EC50) mean values were 0.45 mg L -1 (As III) and 0.54 mg L -1 (As V) for D. similis, and 0.44 mg L -1 (As III) and 0.69 mg L -1 (As V) for C. ), showing synergistic effect of these substances.

The Ecological Risk Assessment of Ash Toxicity in the Freshwater Crustacean Simocephalus vetulus Schϕdler 1858

“…Therefore, ash concentration has toxicity value higher than those reported by another toxicity test, and this was occurring from the lower values of LC50 which were observed in this study. The LC50 values of the current study were near to the LC50 values which were founded by Sales [27] who observed the LC50 values were 0.45 and 0.44 mg/L respectively when exposed Daphnia similis and Ceriodaphnia silvestre to toxicity of arsenic (AsIII). Due to higher mortality of ash concentrations exposed to S. vetulus in previous periods, the toxicity curves of 96 hr.…”

“…The sensitivity of the organisms should be increase clearly. This may be related to the synergistic effect of these toxic substances in ash concentrations [27]. Or whether, all groups during the acute exposure were not added any food, therefore this may be related to their ash particles have the ability to pass through individual membranes without the need of food [33], or may be attributed to morphology and particles diameter in the ash.…”

Niche overlap analysis of a lizard assemblage from the Atlantic Rainforest, evaluation of arsenic toxicity in cladocerans, and molecular biology of mycoplasmas

“…In the study published in this volume of the AABC, Sales et al (2016) evaluated the potential arsenic toxicity in two species of cladocerans, a group of small crustaceans that are important organisms in ecotoxicological studies. They show that, under certain conditions, different cladocerans display more effective mechanisms to reduce arsenic toxicity (Sales et al 2016). …”

Contaminação aquática por rejeito de mineração: o caso do desastre ambiental de Mariana (MG)

“…Portanto, é de se esperar que todos os metais quantificados na água deste trabalho tenham exercido efeitos tóxicos para a alga R. subcapitata. Considerando os resultados obtidos para C. silvestrii, destaca-se que a ausência de toxicidade aguda em bioensaios com cladóceros também já foi reportada por outros autores (ABESSA et al, 2016;RIETZLER et al, 2016;MENDES et al, 2020) Organismos planctônicos são ótimas ferramentas bioindicadoras de qualidade ambiental (ZEBRAL et al, 2021). Em estudos de campo Bonecker et al (2022) observaram baixa diversidade na comunidade marinha zooplanctônica de locais afetados pela lama em comparação a sítios controles.…”

“…A ausência de toxicidade aguda identificadas em C. sancticaroli e em D. rerio neste estudo está de acordo com outros estudos que não verificaram efeitos agudos de água contaminada em peixes (Danio rerio e Geophagus brasiliensis), cladóceros (Daphnia similis e Ceriodaphnia silvestrii) e bactéria (Vibrio fischeri) (ABESSA et al, 2016;GOMES et al, 2016;SARTORI et al, 2016;RIETZLER et al, 2016;MENDES et al, 2020). Porém, ressalta-se a importância da realização de bioensaios crônicos, conforme observado para outras espécies, para verificação dos efeitos em maior tempo de exposição e na avaliação de efeitos subletais.…”