Fine-scale differences in diel activity among nocturnal freshwater planarias (Platyhelminthes: Tricladida)

摘要

BackgroundAlthough most freshwater planarias are well known photonegative organisms, their diel rhythms have never been quantified. Differences in daily activity rhythms may be particularly important for temperate-climate, freshwater planarias, which tend to overlap considerably in spatial distribution and trophic requirements.