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Abstract
patterns of electroretinogram (ERG) and electromyogram (EMG) of un
The study aimed to develop a method to simultaneously record circadian restrained Egyptian yellow fat-tailed scorpion Androctonus australis under different light regimens. The study concerned also with using this new method to analyze the possible role of pectines and substrate on the modulation of the scorpion circadian activities. A special aluminum jacket was designed and fixed to the scorpion properly allowing its free-moving in the arena. This light-jacket extends along the scorpion body from the chelicerae to the metasoma. An IR camera was placed inside the cage to monitor the different types of scorpion circadian locomotor activity. Rest-state and three types of active behavioral categories were observed using both EMG recording and IR-camera monitoring. The scorpion started its activity at the beginning of the subjective night, the amplitude of the ERG changed along the 24 hours. Taking together, the light aluminum jacket enabled simultaneously recording of the ERG and EMG from free-moving scorpions. The study also revealed that substrate plays an important role in modulating of the circadian locomotor activity, whereas it suggests that the pectines play a limited role in the modulation of the locomotor behaviors.