Zotin A A, Kleĭmenov S Iu
Izv Akad Nauk Ser Biol. 2013 Nov-Dec(6):653-60.
Two endogenous biorhythms of the oxygen consumption rate 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 x g) at the age of 20 weeks to 3 μL O2/(h x 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 x g).
通过奇异谱分析，在淡水腹足纲动物静水椎实螺幼体后期个体发育过程中，发现了耗氧率的两种内源性生物节律，其周期分别为10.3周和7.2周。已确定不同个体中这两种生物节律的局部最大值出现在相同年龄；除此之外，所有研究动物的生物节律周期大致相同，并且在整个个体发育过程中保持不变。值得注意的是，周期为10.3周的生物节律会衰减（其振幅从20周龄时的8μL O2/(h x g)下降到死亡时的3μL O2/(h x g)），而周期为7.2周的生物节律则持续存在（其平均振幅为2.4±0.4μL O2/(h x g)）。
