Video, Paper published: On studying the hazards of pollution of the biosphere: effects of sodium dodecylsulfate (SDS) on planktonic filter-feeders. Video of daphnia.

http://5bio5.blogspot.ru/2014/04/paper-published-on-studying-hazards-of.html

On-studying-the-hazards-of-pollution-of-the-biosphere-effects-of-sodium-dodecylsulfate-SDS-on-planktonic-filter-feeders

S. A. Ostroumov

DOI:10.1134/S0012496609020136

ABSTRACT:

NEW FACT: SYNTHETIC SURFACTANT SLOWS DOWN FEEDING RATE OF DAPHNIA.

Vorozhun I. M., S. A. Ostroumov. On studying the hazards of pollution of the biosphere: effects of sodium dodecylsulfate (SDS) on planktonic filter-feeders. - Doklady Biological Sciences, 2009, Vol. 425, pp. 133–134. Tables. Bibliogr. 15 refs. ISSN 0012-4966. DOI: 10.1134/S0012496609020136;

Full text online see:
https://www.researchgate.net/publication/216175249_On_studying_the_hazards_of_pollution_of_the_biosphere_effects_of_sodium_dodecylsulfate_%28SDS%29_on_planktonic_filter-feeders;

http://www.springerlink.com/content/p7754h672w814m30/;
** Full text online free: http://www.scribd.com/doc/45914806;
** http://www.citeulike.org/user/ATP/article/6113581;
[the original Russian text: I.M. Vorozhun, S.A. Ostroumov, 2009, published in Doklady Akademii Nauk, 2009, Vol. 425, No. 2, pp. 271–272].

** The goal of this study was to test whether the synthetic anionic surfactant sodium dodecyl sulfate, SDS, has an inhibitory effect on the ability of the planktonic filter-feeder, daphnia Daphnia magna to remove  phytoplankton from water during their filtration activity. Daphnia were kept under laboratory conditions in vessels and fed with phytoplankton: the green algae Scenedesmus quadricauda (Turp.) Breb. After filtration for 6–24 h in the presence of SDS at concentrations 5 and 10 mg/l, the abundance of S. quadricauda cells in water was higher than in the control. At the lower SDS concentrations (0.1, 0.5, and 1 mg/l), differences in the abundance of algal cells relative to the control were observed after 3 h of incubation and disappeared after 6–24 h of incubation. The calculation of the mean rate of algae removal by daphnia showed that this parameter decreased within the first 3 h after the beginning of incubation in the presence of SDS.
** CONCLUSION. It is the first time that it was demonstrated that the synthetic surfactant SDS decreased the rate of water filtration by the planktonic crustaceans D. magna.

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Video of Daphnia:
http://www.youtube.com/watch?v=b7UFjsAYr3Y