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JOURNAL OF PLANKTON RESEARCH | VOLUME 19 | NUMBER 1 | PAGES 149-154 | 1997
© Oxford University Press

other

Keeping Daphnia out of the surface film with cetyl alcohol

Kristen H. Desmarais

WK.Kellogg Biological Station and Department of Zoology, Michigan State University 3700 E. Gull Lake Drive, Hickory Corners; MI 49060, USA

Received on December 22, 1996; accepted on August 7, 1996 Some Daphnia species are difficult to culture due to a tendency to become trapped in the surface film. A low level of cetyl alcohol (1.26 ± 0.12 mg) was shown to be highly effective in reducing the surface film entrapment of a Daphnia species typically susceptible to such a problem (D.rosea). In a species that does not exhibit surface film problems (D.pulicaria), a low level of cetyl alcohol had no effect, indicating that this substance is not toxic to Daphnia in low quantities. However, a high level (10.6 ± 1.0 mg) of cetyl alcohol was shown to decrease the survival of both species and reproduction of the susceptible species.


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