Visual adaptation and retinal characterization of the Garganey (Anas querquedula): Histological and scanning electron microscope observations

解剖 扫描电子显微镜 视网膜 六方晶系 网状结缔组织 电子显微镜 镜头(地质) 生物 环境扫描电子显微镜 适应(眼睛) 光学 材料科学 化学 复合材料 结晶学 物理 古生物学
作者
Naglaa F. Bassuoni,Mohamed M. A. Abumandour,Ahmed A. El‐Mansi,Basma G. Hanafy
出处
期刊:Microscopy Research and Technique [Wiley]
卷期号:85 (2): 607-616 被引量:5
标识
DOI:10.1002/jemt.23934
摘要

The present study was designed to provide a complete morphological description of the eye of the migratory Garganey duck (Anas querquedula) and its visual adaptation with the different surrounding environmental conditions during its migration journeys using a stereomicroscope, scanning electron microscope (SEM), and light microscope. The current work depends on six adult Garganey ducks that were captured from the area near and on the shores of Edku city. The obtained results revealed that the eye of the migratory Garganey duck has the features of both diurnal and nocturnal birds. The histological examination reveals that the pigmented epithelium of the retina has long prolongations filled with melanin. The cone is the dominant photoreceptor, but simple rods are present. The inner nuclear and ganglion cell layers are thick. SEM examination shows that the arrangement of the collagen fibrils on the external surface was reticular in shape. The radial folds present as pledged structures on the pigmented epithelium covered with circular structures. The main lens body has flat with hexagonal outlines fibers. The edges and surfaces of these hexagonal fibers were studded with protrusions or elevations (balls) and depressions (sockets). The sockets and balls were either rounded or ellipsoid in shape. The balls were more on the edges and the sockets on the surface. In conclusion, our findings indicated a higher degree of functional adaptation between the morphological structure of the eye and the surrounding environmental conditions.
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