Behavioural circadian rhythms measured in real-time by automatic image analysis: applications in parasitoid insects |
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Authors: | ROLAND ALLEMAND FRANCOIS POMPANON FREDERIC FLEURY PIERRE FOUILLET MICHEL BOULETREAU |
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Institution: | UniversitéC. Bernard Lyon I, Laboratoire de Biométrie, Biologie et Génétique des Populations, UA. CNRS 243. Villeurbanne, France |
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Abstract: | Abstract. A video analysis system was developed to study behavioural circadian rhythms in insects. Technical innovations were performed in image analysis and in the use of robotics. In image analysis, both the automatic detection of the insect and the calculation of several variables (linear and angular speed, locomotor activity, etc.) are carried out in real-time, which saves time and allows long-term studies without any intervention of the operator. The displacement of the camera by robotics allows the simultaneous study of many individuals (i.e. sixty individuals for the study of locomotor activity of adult insects, more than 400 individuals for the study of the emergence of adult parasitoids from their host). Four applications of this new device are presented. They deal with circadian rhythms in parasitoid insects: locomotor activity and time variation in locomotory parameters, daily distribution of the emergence and onset of the locomotor activity in adults. The adaptability of the system to several experimental materials and situations is discussed and the interest of the study of behavioural rhythms in the approach of host-parasitoid associations is emphasized. |
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Keywords: | Video image analysis automatic tracking behavioural circadian rhythms parasitoid insects locomotor activity adult emergence |
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