AI Article Synopsis
- Bioassays were conducted using Daphnia pulex and Moina micrura to identify cyanobacterial neurotoxins in raw water samples from a eutrophic reservoir.
- The study found that exposure to toxic cyanobacteria caused paralysis in Daphnia within 0.5 to 3 hours, but these organisms could recover almost completely within 24 hours in clean water.
- Statistical analysis revealed strong correlations between the paralysis of Daphnia and factors like cell density and saxitoxin levels, indicating the Daphnia bioassay is a sensitive and effective method for detecting neurotoxins in natural water samples.
Article Abstract
Bioassays using Daphnia pulex and Moina micrura were designed to detect cyanobacterial neurotoxins in raw water samples. Phytoplankton and cyanotoxins from seston were analyzed during 15 months in a eutrophic reservoir. Effective time to immobilize 50% of the exposed individuals (ET50) was adopted as the endpoint. Paralysis of swimming movements was observed between approximately 0.5-3 h of exposure to lake water containing toxic cyanobacteria, followed by an almost complete recovery of the swimming activity within 24 h after being placed in control water. The same effects were observed in bioassays with a saxitoxin-producer strain of Cylindrospermopsis raciborskii isolated from the reservoir. Regression analysis showed significant relationships between ET50 vs. cell density, biomass and saxitoxins content, suggesting that the paralysis of Daphnia in lake water samples was caused by saxitoxins found in C. raciborskii. Daphnia bioassay was found to be a sensitive method for detecting fast-acting neurotoxins in natural samples, with important advantages over mouse bioassays.
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| http://dx.doi.org/10.1016/j.envpol.2010.03.007 | DOI Listing |
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