Abstract
Two endogenous biorhythms of the mass specific rate of oxygen consumption with periods of 10.3 and 7.2 weeks have been revealed in the late postlarval ontogenesis of freshwater gastropods Lymnaea stagnalis by singular spectrum analysis. It has been determined that local maxima of both biorhythms in different individuals occur at the same age; in addition to that, the periods of biorhythms are approximately the same in all studied animals and remain unchanged during the whole individual development. It has been noted that the biorhythm with a period of 10.3 weeks is damped (its amplitude decreases from 8 μL O2/(h g) at the age of 20 weeks to 3 μL O2/(h g) at the time of death), and the biorhythm with the period of 7.2 weeks is sustained (its average amplitude is 2.4 ± 0.4 μL O2/(h g).
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