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Small eyes in dim light: Implications to spatio-temporal visual abilities in Drosophila melanogaster.
Vision Research ( IF 1.5 ) Pub Date : 2020-03-09 , DOI: 10.1016/j.visres.2020.02.007
Ravindra Palavalli-Nettimi 1 , Jamie C Theobald 1
Affiliation  

Fruit flies, Drosophila melanogaster, are active over a range of light intensities in the wild, but lab-reared flies are often tested only in bright light. Similarly, scarce feeding during larval stages-common in nature-generates smaller adults, and a wide range of eye sizes not found in well-fed lab colonies. Both dimmer light and smaller eyes limit light capture and have undetermined effects on visual behaviors such as flight. In this study, we used moving sinusoidal gratings to test spatial acuity, temporal acuity, and contrast threshold of female flies of varying eye sizes at different light intensities. We also investigated vision in the smaller and often neglected male fruit flies. As light intensity drops from 50.1 lx to 0.3 lx, flies have a reduced spatial acuity (females: from 0.1 to 0.06 cycles per degree, CPD, males: 0.1 to 0.04 CPD) and temporal acuity (females: from 50 Hz to 10 Hz, males: 25 Hz to 10 Hz), and an increased contrast detection threshold (females: from 10% to 29%, males: 19% to 48%). We find no major sex-specific differences after accounting for eye size. Visual abilities in both small (eye area of 0.1-0.17 mm2) and large flies (0.17-0.23 mm2) suffer at 0.3 lx compared to 50.1 lx, but small flies suffer more (spatial acuity: 0.03 vs 0.06 CPD, contrast threshold: 76% vs 57%, temporal acuity: 5 Hz vs 10 Hz). Our results suggest visual abilities of small flies suffer more than large flies at low light levels, possibly leading to size- and light intensity-dependent effects on foraging, navigation, and flight.

中文翻译:

在昏暗的灯光下的小眼睛:对果蝇具有时空视觉功能。

果蝇果蝇(Drosophila melanogaster)在野外的各种光照强度下都具有活性,但是实验室饲养的果蝇通常仅在强光下进行测试。同样,在幼虫阶段(自然界中常见)的稀少喂养会导致较小的成年成年人,并且在喂养良好的实验室菌落中没有发现大范围的眼睛。昏暗的光线和较小的眼睛都限制了光线的捕获,并且对诸如飞行等视觉行为没有确定的影响。在这项研究中,我们使用移动正弦光栅测试在不同光强度下不同眼大小的雌蝇的空间敏锐度,时间敏锐度和对比度阈值。我们还研究了较小且经常被忽视的雄性果蝇的视力。随着光强度从50.1 lx下降到0.3 lx,果蝇的视敏度降低(雌性:每度0.1至0.06个周期,CPD,雄性:0.1至0。04 CPD)和颞敏度(女性:50 Hz至10 Hz,男性:25 Hz至10 Hz),以及增强的对比度检测阈值(女性:从10%至29%,男性:19%至48%)。在考虑了眼睛大小之后,我们发现没有主要的性别差异。小苍蝇(0.1-0.17 mm2的眼睛区域)和大苍蝇(0.17-0.23 mm2)的视觉能力比50.1 lx低0.3 lx,但小苍蝇的视觉能力更强(空间敏锐度:0.03 vs 0.06 CPD,对比度阈值:76 %vs. 57%,时间敏锐度:5 Hz vs 10 Hz)。我们的结果表明,在低光照条件下,小苍蝇的视觉能力比大苍蝇遭受的伤害更大,这可能导致觅食,航行和飞行对大小和光照强度的影响。19%至48%)。在考虑了眼睛大小之后,我们发现没有主要的性别差异。小苍蝇(0.1-0.17 mm2的眼睛区域)和大苍蝇(0.17-0.23 mm2)的视觉能力比50.1 lx低0.3 lx,但小苍蝇的视觉能力更强(空间敏锐度:0.03 vs 0.06 CPD,对比度阈值:76 %vs. 57%,时间敏锐度:5 Hz vs 10 Hz)。我们的研究结果表明,在低光照条件下,小苍蝇的视觉能力比大苍蝇遭受的伤害更大,这可能会导致觅食,导航和飞行对大小和光照强度的影响。19%至48%)。在考虑了眼睛大小之后,我们发现没有主要的性别差异。小苍蝇(0.1-0.17 mm2的眼睛区域)和大苍蝇(0.17-0.23 mm2)的视觉能力比50.1 lx低0.3 lx,但小苍蝇的视觉能力更强(空间敏锐度:0.03 vs 0.06 CPD,对比度阈值:76 %vs. 57%,时间敏锐度:5 Hz vs 10 Hz)。我们的结果表明,在低光照条件下,小苍蝇的视觉能力比大苍蝇遭受的伤害更大,这可能导致觅食,航行和飞行对大小和光照强度的影响。时间敏锐度:5 Hz和10 Hz)。我们的结果表明,在低光照条件下,小苍蝇的视觉能力比大苍蝇遭受的伤害更大,这可能导致觅食,航行和飞行对大小和光照强度的影响。时间敏锐度:5 Hz和10 Hz)。我们的结果表明,在低光照条件下,小苍蝇的视觉能力比大苍蝇遭受的伤害更大,这可能导致觅食,航行和飞行对大小和光照强度的影响。
更新日期:2020-03-09
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