Cone distribution and visual resolution of the yellow-legged gull, Larus michahellis (Naumann, 1840)
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Título: | Cone distribution and visual resolution of the yellow-legged gull, Larus michahellis (Naumann, 1840) |
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Autor/es: | Victory, Noemí | Segovia, Yolanda | García, Magdalena |
Grupo/s de investigación o GITE: | Grupo de Inmunología, Biología Celular y del Desarrollo |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Biotecnología |
Palabras clave: | Avian retina | Cone oil droplets | Cone photoreceptors | Cone topography | Vision in seabirds |
Área/s de conocimiento: | Biología Celular |
Fecha de publicación: | 22-dic-2021 |
Editor: | Wiley-VCH GmbH |
Cita bibliográfica: | Anatomia, Histologia, Embryologia. 2022, 51(2): 197-214. https://doi.org/10.1111/ahe.12779 |
Resumen: | The morphological characteristics of the yellow-legged gull's photoreceptors and cone distribution were studied using light and electron microscopy. In wholemount fresh retinas, five different coloured oil droplets located in the cone inner segments could be seen and characterized by colour, diameter and stratification. The photoreceptors were classified by comparing the fresh and fixed vertical sections under a light and electron microscope. Rods were easily distinguished from cones based on the outer segment morphology and the absence of oil droplets in their inner segments. Four types of single cones were associated with red, yellow, colourless and transparent oil droplets. Unequal double cones comprised a long principal member with a green oil droplet and an accessory short member containing a green microdroplet which was highly electron-dense under electron microscopy. The different types of oil droplets were counted from microphotographs of fresh retinal samples in 20 regions. The density, percentage and diameter of the oil droplets were determined. The results showed that central regions had the highest oil droplet density which decreased towards the retinal periphery in all quadrants. Moreover, the oil droplet density was higher in the dorsotemporal quadrant than in other retinal regions. The average density of the red oil droplets was highest in the central areas, whereas colourless oil droplets had the highest density throughout the retina. In contrast, transparent oil droplets had the lowest density across all the regions of the retina. Finally, the retinal resolution was 52.61 cycles/degree. It was calculated using the posterior nodal distance and the oil droplet diameter. The work concludes by discussing the significance of the relative proportion of different cone types across the retina. |
Patrocinador/es: | This research was supported by the University of Alicante, VIGROB-186. |
URI: | http://hdl.handle.net/10045/120629 |
ISSN: | 0340-2096 (Print) | 1439-0264 (Online) |
DOI: | 10.1111/ahe.12779 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2021 The Authors. Anatomia, Histologia, Embryologia published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1111/ahe.12779 |
Aparece en las colecciones: | INV - Grupo de Inmunología - Artículos de Revistas |
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