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activity pattern activity per hour activity recorded actographs animals recorded animals were recorded April Astacidae Biol biological rhythms Bovbjerg Cambarus cave crayfish changing photoperiod constant darkness constant illumination crayfish activity days preceding full Dugesia Figure 26 footcandles geomagnetic activity grand mean Guyselman habitats horizontal vector July June laboratory LD cycle LD regime light-dark cycle light-dark regime locomotor activity lunar modulation Lunar periodicities lunar phase lunar rhythm lunar-day cycles lunar-day patterns lunar-day periodicity lunar-monthly patterns magnetic fields maximum mean activity mean monthly activity Missouri River Nassarius natural illumination neutral sheet onset of activity Orconectes immunis Orconectes virilis orientation Patapsco River patterns of activity peak activity percent activity persistent phase-shift photoperiod planaria pond preceding figures preceding full moon reported reversed similar solar-day patterns species of crayfish three-day moving means trough in activity unimodal upper transit vector of magnetism Volvox