Effect of algal surface area and species interactions in toxicity testing bioassays

Fawaz, Elyssa G.; Kamareddine, Lina A.; Salam, Darine A.

doi:10.1016/j.ecoenv.2019.03.032

Cited by 5 publications

(2 citation statements)

References 49 publications

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“…Scenedesmus subspicatus is a freshwater green microalgae rich in lipids, lutein, and proteins. It contributes to primary production in most habitats and responds rapidly when exposed to contaminants, thus predicting the first impacts on the ecosystem (FAWAZ, KAMAREDDINE and SALAM, 2019). The advantages of using this species in bioassays are its high sensitivity to different toxic substances and relatively short life cycle, allowing the observation of probable effects in several generations.…”

Section: Scenedesmus Subspicatusmentioning

confidence: 99%

Use of ecotoxicological bioindicators in effluent monitoring — legal implications in Brazil

Pereira da Silva Alves,

Borges Teixeira,

Teófilo

et al. 2024

Eng. Sanit. Ambient.

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Environmental changes directly influence quality of life, and environmental protection laws arise to ensure the maintenance of ecological balance. Aquatic environments have been contaminated by substances of anthropic origin, which are called effluents. Improper disposal of effluents has adverse effects on the environment and human health. In Brazilian legislation, the resolutions of the National Council for the Environment (CONAMA) RE 357/2005 and RE 430/2011 address the use of indicator species to evaluate the effluents’ toxicity. Despite these, much still needs to be done to control and monitor the emission of effluents in Brazilian water resources. The objective of this work was to carry out a historical survey of the regulations on the disposal of effluents in Brazil and to show the differences in each state's regulations, highlighting the indicator species accepted in each regulation and their advantages and disadvantages. In this way, this review summarizes and organizes the information of the Brazilian legislation on the disposal of effluents and helps the researcher in the area to choose between the methodologies adopted for the analysis of their environmental samples. Despite the insertion of bioassays, it is evident that the current Brazilian legislation is permissive, requiring adaptations and definitions to increase adherence to the ecotoxicological monitoring of water resources by the States.

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Section: Scenedesmus Subspicatusmentioning

confidence: 99%

Use of ecotoxicological bioindicators in effluent monitoring — legal implications in Brazil

Pereira da Silva Alves,

Borges Teixeira,

Teófilo

et al. 2024

Eng. Sanit. Ambient.

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“…Larger cell has more surface area but less surface/volume, so larger cell may have more metal uptake sites per cell but less metal uptake sites per weight or carbon content of cell. The relationship was much more obvious between Cyanobacteria and Eukaryotic algae (Fawaz et al, 2019), as the Cyanobacteria has the largest ratio of surface/volume or the minimum surface area, and these small particles usually preformed a better capacity for Cu uptake and a more sensitivity to Cu (Brand et al, 1986). Cyanobacteria showed an enhancement of tolerance with the increase of cell size (Debelius et al, 2010).…”

Section: Short-term Cu Uptake In Different Phytoplanktonmentioning

confidence: 99%

Copper uptake and subcellular distribution in five marine phytoplankton species

2022

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Copper (Cu) uptake and trophic transfer in marine plankton at the environmentally relevant levels have rarely been investigated. In this study, we investigated the Cu uptake and subcellular distribution in five phytoplankton (Isochrysis zhanjiangensis, Phaeocystis sp., Isochrysis galbana, Chaetoceros sp. and Phaeodactylum tricornutum) belonging to two taxa Chrysophyta and Bacillariophyta, and the following trophic transfer to rotifer Brachionus plicatilis by using stable isotope tracing method. In 2-hour exposure, Cu uptake rates were 20.8–60.3 amol h-1 cell-1 (amol = 10-18 mol) in the phytoplankton exposure to 4.82 × 10-13 mol L-1 free Cu activity ([Cu2+]). Cu uptake rates were increased with the increase of [Cu2+] in all the phytoplankton species. Generally, Cu uptake rate constants (kus) were lower in Bacillariophyta (Chaetoceros sp. and P. tricornutum) than Chrysophyta (I. zhanjiangensis, Phaeocystis sp. and I. galbana). While in long-term (6 day) exposure, more Cu was accumulated in the Bacillariophyta than in Chrysophyta, suggesting Bacillariophyta might have more Cu capacity than Chrysophyta. Size effects of cells on Cu uptake were not observed among these five phytoplankton. Cu was mainly distributed in the heat-denatured protein plus organelle fraction and head-stable protein fraction in all the five phytoplankton. The Cu assimilation efficiencies (AEs) in rotifer feeding I. zhanjiangensis, Phaeocystis sp., I. galbana, Chaetoceros sp. and P. tricornutum were 63.4%, 57.6%, 60.2%, 77.4% and 14.6%, respectively. These Cu AEs were positively correlated to the Cu distribution in the trophically available metal fraction (TAM) in different phytoplankton. These results herein demonstrated that different marine phytoplankton had different strategies to accumulate Cu that influence Cu transfer to the predators. Therefore, the variation of the phytoplankton community will change the Cu biogeochemistry in marine environment.

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Oxidative stress and toxicology of Cu2+ based on surface areas in mixed cultures of green alga and cyanobacteria: The pivotal role of H2O2

et al. 2020

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Effect of algal surface area and species interactions in toxicity testing bioassays

Cited by 5 publications

References 49 publications

Use of ecotoxicological bioindicators in effluent monitoring — legal implications in Brazil

Use of ecotoxicological bioindicators in effluent monitoring — legal implications in Brazil

Copper uptake and subcellular distribution in five marine phytoplankton species

Oxidative stress and toxicology of Cu2+ based on surface areas in mixed cultures of green alga and cyanobacteria: The pivotal role of H2O2

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