Guérin, J.P., M. Kirchner & F. Cubizolles. (2001). Effects of Oxyrrhis marina (Dinoflagellata), bacteria and vitamin D2 on population dynamics of Tisbe holothuriae (Copepoda). Journal of Experimental Marine Biology and Ecology. 261(1): 1-16.
Guérin, J.P., M. Kirchner & F. Cubizolles
Effects of Oxyrrhis marina (Dinoflagellata), bacteria and vitamin D2 on population dynamics of Tisbe holothuriae (Copepoda)
Journal of Experimental Marine Biology and Ecology
NeMys doc_id: 11204 The World Of Copepods (T. Chad Walter)
Available for editors
Laboratory experiments were performed to determine which food combinations had the most favorable effect on population dynamics of the harpacticoid copepod Tisbe holothuriae. In addition to basic diets of TetraMin Ž T . , rice Ž R . or a mixture of both Ž TqR . , supplements consisting of the following were given: the heterotrophic dinoflagellate Oxyrrhis marina, a bacterial suspension and vitamin D 2 . Results show a beneficial effect of bacteria at a given concentration on T. holothuriae, which is enhanced in combination with vitamin D 2 . A higher concentration of bacteria together with vitamin D 2 , however, has a reverse effect leading to greater mortality, lower sex ratio and number of ovigerous females, and a dramatic decrease in production of eggs, regardless of the basic diet. We conclude that different concentrations of a given bacterial community may have variable effects on the reproduction of harpacticoid copepods and that, in addition to the bacteria, vitamin D 2 may also play a role in invertebrate nutrition.