Small fruit flies sacrifice temporal acuity to maintain contrast sensitivity
| Autor: | Joshua L. Smith, John P. Currea, Jamie C. Theobald |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
genetic structures media_common.quotation_subject Visual Acuity Zoology Biology Body size Eye Summation Article Contrast Sensitivity 03 medical and health sciences Ommatidium Animals Contrast (vision) media_common Larva fungi Organ Size eye diseases Sensory Systems Ophthalmology 030104 developmental biology Instar Drosophila sense organs Temporal acuity |
| Zdroj: | Vision Research. 149:1-8 |
| ISSN: | 0042-6989 |
| DOI: | 10.1016/j.visres.2018.05.007 |
| Popis: | For holometabolous insects like the fruit fly, growth is restricted to the larval stages of development and limited larval feeding, common in nature, results in smaller adult flies. Despite the importance of vision to flies, smaller adults possess smaller eyes that, in principle, must sacrifice spatial acuity or contrast sensitivity due to smaller optics. Because fruit fly vision is currently understood from uniformly large, lab-reared adults, how early development affects adult vision is unknown. Do smaller eyes sacrifice spatial acuity, by increasing their inter-ommatidial angles, or sensitivity, by decreasing their ommatidial diameters? Further, might the visual system neurally adapt to these optical constraints via temporal or spatial pooling? To address these questions, we first generate a broad distribution of body (1.67–2.34mm; n=24) and eye lengths (0.33–0.44mm; n=24) by removing larvae from their food during their third instar, resulting in flies more similar to those in the wild. Then, we measure the optical sacrifices of small eyes, finding that smaller eyes (0.19 vs. 0.07mm(2)) have substantially fewer (978 vs. 540, n=45) and smaller ommatidia (222 vs. 121μm(2); n=45) separated by slightly wider inter-ommatidial angles (4.5 vs. 5.5°; n=34). This corresponds to a greater loss in contrast sensitivity ( |
| Databáze: | OpenAIRE |
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