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JPR Advance Access published online on June 24, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi040
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received March 31, 2005
Accepted June 16, 2005

Article

Supplementation of the protist Chilomonas paramecium with a highly unsaturated fatty acid enhances its nutritional quality for the rotifer Keratella quadrata.

Iola G. Boëchat 1*, Sebastian Schuran 1, and Rita Adrian 1

1 Leibniz-Institut für Gewässerökologie und Binnenfischerei, Müggelseedamm 301, D-12587 Berlin, Germany

* To whom correspondence should be addressed.
Iola G. Boëchat, E-mail: iboechat{at}gmx.net


  Abstract

We tested whether a fatty acid supplementation technique using bovine serum albumin (BSA) as a carrier, previously developed for autotrophic protists, is also appropriate for supplementation of Chilomonas paramecium - a flagellated heterotrophic protist. C. paramecium was successfully enriched with eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), both known to be essential for crustacean zooplankton. Preparing C. paramecium enriched with EPA and DHA in concentrations similar to those found in Cryptomonas phaseolus, an alga known to support high growth and reproduction of Keratella, allowed us to test the direct nutritional effects of EPA and DHA on population growth and reproduction of the rotifer Keratella quadrata. Growth rates and egg production were highest when K. quadrata was fed C. phaseolus. Compared to non-supplemented C. paramecium, egg production of K. quadrata was significantly enhanced on a diet of C. paramecium enriched with DHA, whereas no significant effects could be attributed to EPA enrichment. We conclude that DHA is important for reproduction of K. quadrata but cannot explain the majority of the difference in food quality between C. paramecium and C. phaseolus.

Keywords: Fatty acids. Supplementation. Heterotrophic protists. Nutritional quality. Rotifers.
Communicating Editor: KJ Flynn
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