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Abstract
When parental females (♀♀P = mothers) of the rotifer Notommata copeus are placed in light conditions inducing the appearance of mictic females in their offspring (F1), the age of the parents of these parental females significantly affects the ratio of mictic females in the F1 generation.
The preparental females (♀♀PP = grandmothers), the parental females and the F1 females are isolated in a medium changed at each generation and, in the second experimental series, changed daily: the preparental age effect implicates the transmission of substances on two generations.
This influence of the preparental age is rhythmic: the ratio of mictic females in F1 related to this age varies in a sinusoidal manner. This influence is endogenous: it persists, always in a sinusoidal form, when the medium in which each grandmother is placed is changed daily.
Furthermore, the net reproduction ratio, Ro, does not vary significantly with the preparental age during these experiments.
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