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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 3012

Roger Pourriot and Claude Rougier; [Importance volumetrique des oeufs chez les Rotiferes planctoniques] (Volumetric importance of the eggs in planktonic rotifers). Annls Limnol. 27(1):15-24, 1991

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The relationships between amictic egg volume (Vo) and adult female volume (Va) have been established and discussed in 21 natural of laboratory populations of planktonic rotifers belongs to 15 species. In the herbivorous rotifers, the allometric relationship is described by the following equation: Vo=3.62Va(0.816). The exponent of the equation is close to the general value of 0.75. Similarly to the interspecific relationships, the egg to volume rations vary within a rotifer species (ex. Brachionus calyciflorus). These relationships differ in the ovoviviparous genus Asplanchna, with a relative dry mass content (4% of the fresh weight) notably lower than that observed in other species. Similar allometric relations have also been found between the volume of resting eggs or of male eggs and the volume of their mothers in seven and three of the previous species respectively. Some differences are interpreted as resulting from various selective constraints.