Chronobiological studies on body search, oviposition and emergence of Megaselia scalaris (Diptera, Phoridae) in controlled conditions

Apr 4, 2017Forensic science international

Daily rhythms of body search, egg laying, and emergence in Megaselia scalaris flies under controlled conditions

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Abstract

The scuttle fly Megaselia scalaris lays significantly more eggs during daylight hours compared to night, highlighting its circadian rhythms.

Circadian clocks synchronize behavior and physiology with the 24-hour day-night cycle.
Locomotor activity and egg-laying in M. scalaris are regulated by circadian rhythms.
Light acts as a cue for resetting the circadian clock in this species.
M. scalaris can lay eggs in darkness, but fewer females oviposit during subjective darkness.
Egg-laying peaks during the day, demonstrating a clear circadian pattern.

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Circadian clocks have evolved to synchronize physiology, metabolism and behaviour to the 24-h geophysical cycles of the Earth. Understanding the circadian clock mechanism could play an important role in forensic entomology because it temporally gates behaviour such as locomotor activities, feeding, mating, egg laying and adult emergence which could provide useful information for crime reconstruction. The scuttle fly Megaselia scalaris colonises both exposed and buried bodies, whether indoors or outdoors. Locomotor activity, oviposition and adult emergence of this species have been investigated using technologies employed in many previous Drosophila circadian studies. The results reported here clearly highlight the underlying role of the circadian clock in regulating the behaviour of males and females of M. scalaris, and show the role of light as a "zeitgeber" for clock resetting. In contrast to Calliphoridae, M. scalaris can reach the oviposition site and lay eggs in darkness both during the day and the night, although the number of ovipositing females is lower under subjective darkness. The number of eggs laid shows a clear circadian rhythm with much higher numbers laid during the day than during night or subjective night. In conclusion, locomotor activity and oviposition rate of M. scalaris is under circadian clock control with significant forensic implications.

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Chronobiological studies on body search, oviposition and emergence of Megaselia scalaris (Diptera, Phoridae) in controlled conditions

Abstract

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