Light-induced behavioural effects on the locomotor activity rhythm of the blow fly, Calliphora vicina (Diptera: Calliphoridae)

Title:

Light-induced behavioural effects on the locomotor activity rhythm of the blow fly, Calliphora vicina (Diptera: Calliphoridae)

Creator:

Saunders, David S. and Cymborowski, Bronislaw

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:f10c3acd-9963-4398-a009-d4da5c27d434
uuid:f10c3acd-9963-4398-a009-d4da5c27d434

Subject:

Circadian, blow fly, locomotor activity, and continuous light

Type:

article, model:article, and TEXT

Description:

Under continuous light (LL) of low intensity (up to 2.0 lux), the free-running period of the blow fly activity rhythm lengthened for flies whose initial τDD was less than about 25 h, but shortened for longer-period flies. Light intensity above about 2.0 lux led to an overt behavioural arrhythmicity. A comparison of phases of the oscillation after LL as a function of phases before LL, however, indicated that the oscillation continued its motion even though overt behaviour was arrhythmic. As the intensity during LL increased to 48 lux, phases after LL became centred on a narrow range close to CT 12. Extended periods of brighter light are considered to have two effects: (a) an exogenous "masking" effect occurring at intensities greater than about 2.0 lux, and (b) at intensities between about 2.0 and 48 lux, a gradual resetting of the covert oscillator to CT 12. Between 2.0 and 48 lux, therefore, the circadian oscillation governing locomotor activity in C. vicina continues its motion despite the superficial arrhythmicity in behaviour.

Language:

English

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Source:

European Journal of Entomology | 2008 Volume:105 | Number:4

Harvested from:

CDK

Metadata only:

false