Ecosystem ecology: Models for acute toxicity of pesticides towards Daphnia magna

Abstract The aim of the study was to determine the toxicity of the extract obtained from the cyanobacterial cells derived from the waters of Zemborzycki dam reservoir with use of a battery of biotests. The taxonomic identiﬁcation of the bloom-forming cyanobacteria revealed high abundance of Aphanizomenon ﬂos-aquae and Dolichospermum spp. (Anabaena spp.) and in a lower degree of Microcystis aeruginosa and Planktothrix agardhii. In the extract obtained from concentrated cyanobacterial cells, hepatotoxin microcystin-LR at a concentration of 22.89 ± 3.74 μg/L and neurotoxin Antx-a at 13.02 ± 0.01 μg/L have been detected. Toxicity of the extract was evaluated with the following assays: Daphtoxkit F magna with the crustacean Daphnia magna, Thamnotoxkit F with the crustacean Thamnocephalus platyurus, Rotoxkit F with the rotifer Brachionus calyciﬂorus and Protoxkit F with ciliate Tetrahymena thermophila. The most sensitive organism among all studied was T. platyurus for which EC50 was estimated to be 1.2% of the initial extract concentration. On the basis of the highest obtained value of the toxicity unit (TU = 83) the studied sample was classiﬁed to the IV class, which is of high acute toxicity. Additionally, it was found that reactivity on cyanobacterial products differs greatly among organisms used in bioassays, which indicate the need for using a set of biotests.

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Prediction of acute toxicity of emerging contaminants on the water flea Daphnia magna by Ant Colony Optimization–Support Vector Machine QSTR models

Environmental Science Processes & Impacts ◽

10.1039/c6em00679e ◽

2017 ◽

Vol 19 (3) ◽

pp. 438-448 ◽

Cited By ~ 14

Author(s):

Reza Aalizadeh ◽

Peter C. von der Ohe ◽

Nikolaos S. Thomaidis

Keyword(s):

Support Vector Machine ◽

Acute Toxicity ◽

Ant Colony Optimization ◽

Daphnia Magna ◽

Emerging Contaminants ◽

Ant Colony ◽

Support Vector ◽

Water Flea

Prediction of acute toxicity towardsDaphnia magnausing Ant Colony Optimization–Support Vector Machine QSTR models.

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Acute toxicity assessment of textile dyes and textile and dye industrial effluents using Daphnia magna bioassay

Toxicology and Industrial Health ◽

10.1177/0748233708095769 ◽

2008 ◽

Vol 24 (7) ◽

pp. 491-500 ◽

Cited By ~ 56

Author(s):

Y Verma

Keyword(s):

Acute Toxicity ◽

Daphnia Magna ◽

Aquatic Toxicity ◽

Industrial Effluents ◽

Toxicity Assessment ◽

Textile Dyes ◽

Textile Mill ◽

Golden Yellow ◽

Excellent Method ◽

High Degree

Aquatic toxicity of textile dyes and textile and dye industrial effluents were evaluated in an acute toxicity study using Daphnia magna as an aquatic experimental animal model. The 48-h EC50 value for the azo dyes, Remazol Parrot Green was 55.32 mg/L and for Remazol Golden Yellow was 46.84 mg/L. Whereas 48-h EC50 values for three dye industrial effluents (D1, D2, and D3) were 14.12%, 15.52%, and 29.69%, respectively. Similarly, EC50 value for three textile mill effluents (T1, T2, and T3) were >100%, 62.97%, and 63.04%, respectively. These results also showed linear relationship with high degree of confidence ( r2 = >0.84 to >0.99) between immobility and test concentrations. The ratio of 24 to 48-h EC50 remains to be in between 1.1 and 1.2. The general criteria of toxicity classification showed that both dyes were minor acutely toxic having 48-h EC50 in between 10 and 100 mg/L. Of the six textile and dye industrial effluents tested, one was not acutely toxic (48-h EC50 > 100%) and five were minor acutely toxic (48-h EC50 > 14.12–29.69%). The toxicity classification of effluent based on toxic unit (TU) showed that of the six effluents tested five were found toxic (TU = >1) and one was non-toxic (TU = <1). Thus, dye effluents showed highest toxicity and textile effluents lowest toxicity. The study also suggested that the assay with D. magna was an excellent method for evaluation of aquatic toxicity of dyes and dyes containing industrial effluents.

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