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A case for multiple oscillators controlling different circadian rhythms in Drosophila melanogaster
V Sheeba1, M K. Chandrashekaran, A Joshi
1Evolutionary Biology Laboratory, Evolutionary and Organismal Biology Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, P.O. Box 6436, Jakkur, 560 064, Karnataka, Bangalore, India
Journal of Insect Physiology
|May 29, 2003
Summary
Fruit flies (Drosophila melanogaster) exhibit distinct daily rhythms for eclosion, activity, and egg-laying. These biological rhythms are controlled by separate internal circadian oscillators, influencing their timing within light-dark cycles.
Area of Science:
- Chronobiology
- Animal Behavior
- Genetics
Background:
- Circadian rhythms are endogenous biological processes that regulate daily cycles in organisms.
- The fruit fly Drosophila melanogaster is a model organism for studying circadian rhythms.
- Understanding the genetic and molecular basis of these rhythms is crucial for biological research.
Purpose of the Study:
- To investigate the presence and characteristics of circadian rhythms in Drosophila melanogaster.
- To determine if eclosion, locomotor activity, and oviposition rhythms are controlled by separate circadian oscillators.
- To analyze the temporal niche and free-running periods of these distinct rhythms.
Main Methods:
- Fruit flies (Drosophila melanogaster) were maintained in controlled light-dark (LD) cycles for 35 generations.
- Eclosion, locomotor activity, and oviposition patterns were monitored under constant laboratory conditions.
- Entrainment to LD cycles and free-running periods (tau) of the rhythms were analyzed.
Main Results:
- Eclosion, locomotor activity, and oviposition rhythms were observed in fruit flies.
- These rhythms entrained to a 12:12 h LD cycle, each occupying a different temporal niche.
- The free-running periods (tau) for each rhythm were significantly different.
- Eclosion and activity peaked during the light phase, while oviposition peaked during the dark phase.
Conclusions:
- Distinct circadian oscillators control eclosion, locomotor activity, and oviposition in Drosophila melanogaster.
- These findings highlight the complexity of circadian regulation within a single organism.
- The temporal separation of these rhythms suggests specialized oscillator functions.