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Visual ecology of flies with particular reference to colour vision and colour preferences
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Visual ecology of flies with particular reference to colour vision and colour preferences
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Journal Article
Visual ecology of flies with particular reference to colour vision and colour preferences
2014
Overview
The visual ecology of flies is outstanding among insects due to a combination of specific attributes. Flies’ compound eyes possess an open rhabdom and thus separate rhabdomeres in each ommatidium assigned to two visual pathways. The highly sensitive, monovariant neural superposition system is based on the excitation of the peripheral rhabdomeres of the retinula cells R1–6 and controls optomotor reactions. The two forms of central rhabdomeres of R7/8 retinula cells in each ommatidium build up a system with four photoreceptors sensitive in different wavelength ranges and thought to account for colour vision. Evidence from wavelength discrimination tests suggests that all colour stimuli are assigned to one of just four colour categories, but cooperation of the two pathways is also evident. Flies use colour cues for various behavioural reactions such as flower visitation, proboscis extension, host finding, and egg deposition. Direct evidence for colour vision, the ability to discriminate colours according to spectral shape but independent of intensity, has been demonstrated for few fly species only. Indirect evidence for colour vision provided from electrophysiological recordings of the spectral sensitivity of photoreceptors and opsin genes indicates similar requisites in various flies; the flies’ responses to coloured targets, however, are much more diverse.
Publisher
Springer-Verlag,Springer Berlin Heidelberg,Springer Nature B.V
Subject
