Ref ID : 3011

Roger Pourriot and Claude Rougier; [Effects de la Densite de Population et du Groupement sur la Reproduction de Brachionus calyciflorus (Pallas)] (Effects of population density and grouping on the reproduction of Brachionus calyciflorus (Pallas)). Annls Limnol. 13(2):101-113, 1977

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The complex influence of population density, and especially grouping, is shown by a clone of B. calyciflorus. Four population densities (0.2, 0.6, 1, 2) were used in the experiments, and at two densities (0.2, 2) the reproduction of mictic females in F1 is higher when the parent females are grouped in twos, and lower when they are grouped in sixes. The grouping in sizes also has a negative effect on the fecundity. These effects are difficult to interpret and are different from the results obtained by Gilbert (1963) who worked on a strain of the same species.