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 (T), rice (R) or a mixture of both (T+R), 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.

中文翻译：

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Oxyrrhis marina (Dinoflagellata)、细菌和维生素 D2 对 Tisbe holothuriae (Copepoda) 种群动态的影响

进行了实验室实验，以确定哪些食物组合对 harpacticoid 桡足类 Tisbe holothuriae 的种群动态具有最有利的影响。除了 TetraMin (T)、大米 (R) 或两者的混合物 (T+R) 的基本饮食外，还提供了由以下组成的补充剂：异养鞭毛藻 Oxyrrhis marina、细菌悬浮液和维生素 D(2)。结果显示给定浓度的细菌对 T. holothuriae 的有益作用，与维生素 D(2) 结合可增强。然而，更高浓度的细菌和维生素 D(2) 会产生相反的效果，导致更高的死亡率、更低的性别比和雌性雌性数量，并且无论基本饮食如何，鸡蛋产量都会急剧下降。