Nocturnal illumination dimmer than starlight altered the circadian rhythm of adult locomotor activity of a fruit fly
| Autor: | Pooja Thakurdas, Boynao Sinam, D. S. Joshi, Shweta Sharma, Meenakshi Chib |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Male
medicine.medical_specialty Physiology Period (gene) Photoperiod fungi Nocturnal Biology Motor Activity Locomotor activity Starlight Circadian Rhythm Light intensity Rhythm Endocrinology Duration (music) Physiology (medical) Internal medicine Botany medicine Animals Drosophila Circadian rhythm Photic Stimulation |
| Zdroj: | Chronobiology international. 27(1) |
| ISSN: | 1525-6073 |
| Popis: | The effects of nocturnal irradiance tenfold dimmer than starlight intensity on the locomotor activity rhythm of Drosophila jambulina were investigated in two types of light-dark (12 h:12 h) cycles, in which light intensity of the photophase was 10 lux while that of the scotophase was either 0 lux for control flies or 0.0006 lux for experimental flies. Activity onset in the experimental flies was approximately 5.4 h prior to lights-on, so it occurred around midnight. However, activity onset of the control flies coincided almost with the lights-on. Nevertheless, activity offset was the same in both groups, occurring at lights-off. Duration of the active phase (alpha) and activity passes/fly/cycle (APC) in the experimental flies was far greater than in controls. After-effects of the nocturnal illumination of the light-dark cycles when the flies were transferred to constant darkness were evident as the period of the free-running rhythm was shortened, alpha was lengthened, and APC was enhanced in the experimental compared to control flies. Thus, very low photic sensitivity of these flies appears to be a physiological adaptation to dim-light ambiance in its natural breeding site in the field. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|