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The influence of food quality on the phototactic behaviour of Daphnia magna Straus
Michels, E.; De Meester, L. (1998). The influence of food quality on the phototactic behaviour of Daphnia magna Straus. Biol. Jb. Dodonaea 65: 166
In: Biologisch Jaarboek (Dodonaea). Koninklijk Natuurwetenschappelijk Genootschap Dodonaea: Gent. ISSN 0366-0818, more

Also published as
  • Michels, E.; De Meester, L. (1998). The influence of food quality on the phototactic behaviour of Daphnia magna Straus, in: Beeckman, T. et al. (Ed.) Populations: Natural and Manipulated, Symposium organized by the Royal Society of Natural Sciences Dodonaea, University of Gent, 29 October 1997. Biologisch Jaarboek (Dodonaea), 65: pp. 166, more

Available in Authors 
Document type: Project report

Keywords
    Conferences; Food; Phototaxis; Daphnia magna Straus, 1820 [WoRMS]; Fresh water

Authors  Top 
  • Michels, E.
  • De Meester, L., more

Abstract
    Diets for laboratory culture of Daphnia usually consist of unicellular algae. Because intensive culture of unicellular algae is expensive and labour intensive, partial replacement of algae by yeast could reduce the cost for laboratory culture of Daphnia. In order to determine the effect of food quality on phototactic behaviour of D. magna we tested whether the substitution of a part of unicellular algae (Scenedesmus acutus) by fresh bakers yeast (Saccharomyces cerevisiae) has a significant effect on phototactic behaviour and life history traits of the positive phototactic clone C134. In addition we examined whether an additional supply of ciliates to yeast diets improves the performance of Daphnia compared to a diet solely consisting of yeast. Animals fed with a diet containing less than 25 % algae showed a similar phototactic behaviour as animals fed with a diet that contained 100 % algae. The results of the cohort life table experiment indicate that diets for culturing Daphnia should contain at least 25 % unicellular algae to guarantee a good physiological condition of the animals. Addition of ciliates to yeast diets resulted in a positive effect on the physiological condition of the animals but did not influence the phototactic behaviour.

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