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.

179884

Guérin, J.P., M. Kirchner & F. Cubizolles

2001

261(1): 1-16

Publication

NeMys doc_id: 11204

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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.

Population dynamics

Copepoda

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