Automated Recording of Vertical Negative Phototactic Behaviour in Daphnia magna Straus (Crustacea)

摘要: Diurnal vertical migration is a well-known phenomenon in the circadian activity rhythms of zooplankton. Our goal was to test whether negative phototaxis Daphnia magna clone BEAK (provoked by artificially induced light stress, alternating and dark phases 2 h intervals), its interference with endogenous rhythm diurnal migration, can be automatically registered biomonitor. For first time swimming behaviour D. recorded quantitatively based on nonoptical data recording fully automated biotest system, Multispecies Freshwater Biomonitor new experimental setup consisting column three units (3-level chambers). Circadian clearly 3-level chambers more clear 5 than 1 organism per chamber. The organisms responded stress phototaxis, however best larger chambers. influenced rhythm. This approach may facilitate long-term observations zooplankton future.