Circadian and ultradian activity rhythms of a freshwater gastropod, Helisoma trivolis: the effects of social factors and eye removal.
D000818:Animals; D002940:Circadian Rhythm; D008027:Light; D009043:Motor Activity / Q000502:physiology; D009900:Optic Nerve / Q000502:physiology; D012160:Retina / Q000502:physiology*; D012683:Sensory Deprivation / Q000502:physiology*; D012908:Snails / Q000502:physiology*; D012931:Social Environment