Visual system characterization of the obligate bat ectoparasite Trichobius frequens (Diptera: Streblidae)
Visual system characterization of the obligate bat ectoparasite Trichobius frequens (Diptera: Streblidae)
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DOI：
10.1016/j.asd.2020.101007
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发表时间：
2021-02-19
影响因子：
2
通讯作者：
Dittmar, Katharina
中科院分区：
文献类型：
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作者：
Porter, Megan L.;Cronin, Thomas W.;Dittmar, Katharina
作为蝙蝠的专性体外寄生虫，蝙蝠蝇 Trichobius frequens（双翅目：Streblidae）与其夜间蝙蝠宿主栖息在相同的地下环境中。在这项研究中，我们描述了因黑暗进化而导致视觉系统显着降低的 T. frequests 的宏观形态、光学结构、横纹解剖结构、光感受器吸光度和视蛋白表达。眼睛在 21-22 天的蛹发育期中发育，色素沉着在蛹第 11 天出现。成虫羽化后，T. frequens 的眼睛平均由 8 个小面组成，每个小面覆盖一个由 11 到 18 个估计的视网膜细胞组成的融合横纹。小面和融合横纹的尺寸与其他夜行性昆虫的测量结果相似。 T. frequences 的眼睛具有功能性，如 Rh1 视蛋白的表达所示，形成视觉色素，其峰值灵敏度为 487 nm，与其他双翅目 Rh1 视蛋白类似。未来的研究将评估空间视觉和敏感性能力下降的个体如何仍然捕获足够的视觉信息，以利用飞行来穿越黑暗的栖息地。(c) 2020 Elsevier Ltd. 保留所有权利。
As an obligate ectoparasite of bats, the bat fly Trichobius frequens (Diptera: Streblidae) inhabits the same subterranean environment as their nocturnal bat hosts. In this study, we characterize the macro morphology, optical architecture, rhabdom anatomy, photoreceptor absorbance, and opsin expression of the significantly reduced visual system in T. frequens resulting from evolution in the dark. The eyes develop over a 21-22 day pupal developmental period, with pigmentation appearing on pupal day 11. After eclosion as an adult, T. frequens eyes consist of on average 8 facets, each overlying a fused rhabdom consisting of anywhere from 11 to 18 estimated retinula cells. The dimensions of the facets and fused rhabdoms are similar to those measured in other nocturnal insects. T. frequens eyes are functional as shown by expression of a Rh1 opsin forming a visual pigment with a peak sensitivity to 487 nm, similar to other dipteran Rh1 opsins. Future studies will evaluate how individuals with such reduced capabilities for spatial vision as well as sensitivity still capture enough visual information to use flight to maneuver through dark habitats.(c) 2020 Elsevier Ltd. All rights reserved.