Localization of the pupil trigger in insect superposition eyes
| Autor: | Dan-E Nilsson, G. Höglund, Kurt Hamdorf |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
genetic structures
Physiology business.industry media_common.quotation_subject Adaptation (eye) Compound eye Insect Biology Sensory receptor biology.organism_classification Pupil Behavioral Neuroscience Superposition principle Optics Ommatidium Deilephila elpenor Animal Science and Zoology sense organs business Ecology Evolution Behavior and Systematics media_common |
| Zdroj: | Journal of Comparative Physiology A. 170 |
| ISSN: | 1432-1351 0340-7594 |
| DOI: | 10.1007/bf00196904 |
| Popis: | In the superposition eyes of the sphingid moth Deilephila and the neuropteran Ascalaphus, adjustment to different intensities is subserved by longitudinal migrations of screening pigment in specialized pigment cells. Using ophthalmoscopic techniques we have localized the light-sensitive trigger that controls pigment position. In both species, local illumination of a small spot anywhere within the eye glow of a dark-adapted eye evokes local light adaptation in the ommatidia whose facets receive the light. Details of the response pattern demonstrate that a distal light-sensitive trigger is located axially in the ommatidium, just beneath the crystalline cone, and extends with less sensitivity deep into the clear zone. The distal trigger in Deilephila was shown to be predominantly UV sensitive, and a UV-absorbing structure, presumably the distal trigger, was observed near the proximal tip of the crystalline cone. In Ascalaphus we also found another trigger located more proximally, which causes local pigment reaction in the ommatidia whose rhabdoms are illuminated (the centre of the eye glow). The light-sensitive trigger for this response appears to be the rhabdom itself. |
| Databáze: | OpenAIRE |
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