Ref ID : 2965
Roger Pourriot and Pierre Clement; Comparison of the control of mixis in three clones of Notommata copeus. Arch.Hydrobiol.Beih. 8:174-177, 1977
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In three clones of N. copeus, the same factor (photoperiod) induces the production of mictic females, and the same factors (population density, group effect, and age of preparental female) control the rate of production of mictic females. It is interesting to compare these results with those we have obtained with C. Rougier in another genus, Brachionus. In Brachionus, we found a similar effect of grouping. However, in Brachionus the photoperiod has no effect on the production of mictic females, whereas the effect of the age of parental and preparental female is very strong and linear. These latter results are quite different from the age effects found in N. copeus (Rougier & Pourriot, 1977). It can be concluded that Brachionus and N. copeus differ in genetic factors which affect the mictic response to photoperiod but not in factors that affect the response to grouping.