Seasonality and Fecundity of Daphnia Lumholtzi Sars in Lake Phewa, Nepal

This study aimed to enhance our insight on the potential toxicological effects of silver nanoparticles (AgNPs) into the aquatic environment. To investigate the chronic toxicity of nanoparticles, freshwater micro-crustacean Daphnia lumholtzi was exposed to different concentrations of 0.2, 0.5 µg/l AgNPs, and control, for 21 days. Toxicological endpoints at different growing stages such as the maturation and reproduction were recorded. The reproduction rate of D. lumholtzi exposed to both AgNPs concentrations (0.2 and 0.5 µg/l ) was significantly lower than that of control. In turn, the maturation exposed to both AgNPs concentrations was not significantly different from the control treatment. This result indicates that AgNPs (with a concentration lower than 0.5 µg/l) did not have an adverse effect on the maturation of D. lumholtzi, but AgNPs with a concentration higher than 0.2 caused a toxic effect on the reproduction rate of D. lumholtzi during 21 days of the exposure period. In conclusion, the present results showed that AgNPs have toxic effects on D. lumholtzi and it has the potential to use as good freshwater aquatic zooplankton for assessment on the toxicity of nanomaterials in tropics. The future study should pay more attention to the effect of AgNPs on survival, growth rate, and multiple generations of daphnids to better understand the effects of nanoparticles in general and AgNPs in particular.

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Transgenerational effects of cyanobacterial toxins on a tropical micro-crustacean Daphnia lumholtzi across three generations

Environmental Pollution ◽

10.1016/j.envpol.2018.09.055 ◽

2018 ◽

Vol 243 ◽

pp. 791-799 ◽

Cited By ~ 10

Author(s):

Thanh-Son Dao ◽

Thi-My-Chi Vo ◽

Claudia Wiegand ◽

Ba-Trung Bui ◽

Khuong V. Dinh

Keyword(s):

Transgenerational Effects ◽

Daphnia Lumholtzi ◽

Cyanobacterial Toxins ◽

Three Generations

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Evaluation of acute toxicity of zinc, lead and cadmium to zooplanktonic community in upper Berach river system, Rajasthan, India

South Asian Journal of Experimental Biology ◽

10.38150/sajeb.2(1).p20-26 ◽

2012 ◽

Vol 2 (1) ◽

pp. 20-26

Author(s):

Nadim Chishty ◽

Anil Tripathi ◽

Madhusudan Sharma

Keyword(s):

Heavy Metal ◽

Acute Toxicity ◽

Fresh Water ◽

River Basin ◽

Laboratory Experiments ◽

River System ◽

Daphnia Lumholtzi ◽

Lead And Cadmium ◽

Sensitivity Pattern ◽

Static Bioassay

Current study investigated through static bioassay, the acute toxicity of Zinc,Lead and Cadmium to fresh water zooplankters in the upper Berach riversystem which is a part of Gangetic river system. The river basin stretchesfrom Madar tank to Sarjana tank with a total length of 46 Km, including ninewater bodies i.e. Bada madar tank (73Â‹36Âf0ÂfÂfE and 24Â‹38Âf0ÂhN ), Chhotamadar tank, Fateh sagar lake, Udaisagar lake, UpÂ]stream pond (BichhdiÂ]I),DownÂ]stream pond(BichhdiÂ]II), Gadwa, Daroli and Sarjana tank (73Â‹ 57Âf10ÂhEand 24Â‹14Âf30Âh N). Whole zooplanktonic communities were exposed to different heavy metal stresses. Exposed zooplanktonic community included nine planktonic forms i.e. Heliodiaptomus viduus, Mesocyclops hyalinus, Heterocypris, Daphnia lumholtzi, Moina, Brachionus, Monostyla, Filinia. Cadmium was found to be most toxic and Zinc was least toxic to zooplankton. Ostracods and Cyclops were resistant forms and rotifers were sensitive forms in relation to metallic exposure. Sensitivity pattern observed during laboratory experiments was found to be in accordance with biodiversity variation of zooplankton in different ponds of Berach river system.

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