scholarly journals Retinal topography in two species of flamingo (Phoenicopteriformes: Phoenicopteridae)

2020 ◽  
Vol 528 (17) ◽  
pp. 2848-2863 ◽  
Author(s):  
Thomas J. Lisney ◽  
Simon Potier ◽  
Pierre‐François Isard ◽  
Marielle Mentek ◽  
Mindaugas Mitkus ◽  
...  
Keyword(s):  
Retinal Topography

scholarly journals Retinal Topography in Reef Teleosts

1988 ◽  
Vol 31 (5) ◽  
pp. 283-295 ◽  
Author(s):  
Shaun P. Collin ◽  
John D. Pettigrew
Keyword(s):  
Retinal Topography

The visual system of a Palaeognathous bird: Visual field, retinal topography and retino-central connections in the Chilean Tinamou (Nothoprocta perdicaria)

2014 ◽  
Vol 523 (2) ◽  
pp. 226-250 ◽  
Author(s):  
Quirin Krabichler ◽  
Tomas Vega-Zuniga ◽  
Cristian Morales ◽  
Harald Luksch ◽  
Gonzalo J. Marín
Keyword(s):  
Visual Field ◽  
Visual System ◽  
Retinal Topography ◽  
Nothoprocta Perdicaria

scholarly journals The visual ecology of Holocentridae, a nocturnal coral reef fish family with a deep-sea-like multibank retina

2020 ◽  
pp. jeb.233098
Author(s):  
Fanny de Busserolles ◽  
Fabio Cortesi ◽  
Lily Fogg ◽  
Sara M. Stieb ◽  
Martin Luehrmann ◽  
...  
Keyword(s):  
Visual System ◽  
Reef Fish ◽  
Deep Sea ◽  
Colour Vision ◽  
Ganglion Cells ◽  
Light Sensitivity ◽  
Fish Family ◽  
Visual Systems ◽  
Retinal Topography ◽  
Dim Light

The visual systems of teleost fishes usually match their habitats and lifestyles. Since coral reefs are bright and colourful environments, the visual systems of their diurnal inhabitants have been more extensively studied than those of nocturnal species. In order to fill this knowledge gap, we conducted a detailed investigation of the visual system of the nocturnal reef fish family Holocentridae. Results showed that the visual system of holocentrids is well adapted to their nocturnal lifestyle with a rod-dominated retina. Surprisingly, rods in all species were arranged into 6-17 well-defined banks, a feature most commonly found in deep-sea fishes, that may increase the light sensitivity of the eye and/or allow colour discrimination in dim-light. Holocentrids also have the potential for dichromatic colour vision during the day with the presence of at least two spectrally different cone types: single cones expressing the blue-sensitive SWS2A gene, and double cones expressing one or two green-sensitive RH2 genes. Some differences were observed between the two subfamilies, with Holocentrinae (squirrelfish) having a slightly more developed photopic visual system than Myripristinae (soldierfish). Moreover, retinal topography of both ganglion cells and cone photoreceptors showed specific patterns for each cell type, likely highlighting different visual demands at different times of the day, such as feeding. Overall, their well-developed scotopic visual systems and the ease of catching and maintaining holocentrids in aquaria, make them ideal models to investigate teleost dim-light vision and more particularly shed light on the function of the multibank retina and its potential for dim-light colour vision.

Tubular Eyes of Deep-Sea Fishes: A Comparative Study of Retinal Topography (Part 2 of 2)

1997 ◽  
Vol 50 (6) ◽  
pp. 347-357 ◽  
Author(s):  
S.P. Collin ◽  
R.V. Hoskins ◽  
J.C. Partridge
Keyword(s):  
Comparative Study ◽  
Deep Sea ◽  
Retinal Topography

scholarly journals Retinal topography and microhabitat diversity in a group of dragon lizards

2019 ◽  
Vol 528 (4) ◽  
pp. 542-558 ◽  
Author(s):  
Nicolas Nagloo ◽  
João Paulo Coimbra ◽  
Daniel Hoops ◽  
Nathan S. Hart ◽  
Shaun P. Collin ◽  
...  
Keyword(s):  
Retinal Topography

Retinal Topography in Two Species of Baleen Whale (Cetacea: Mysticeti)

2018 ◽  
Vol 92 (3-4) ◽  
pp. 97-116 ◽  
Author(s):  
Thomas J. Lisney ◽  
Shaun P. Collin
Keyword(s):  
Ganglion Cells ◽  
Feeding Strategy ◽  
Visual Fields ◽  
Humpback Whale ◽  
High Density ◽  
Resolving Power ◽  
Temporal Area ◽  
Baleen Whales ◽  
Axial Diameter ◽  
Retinal Topography

Little is known about the visual systems of large baleen whales (Mysticeti: Cetacea). In this study, we investigate eye morphology and the topographic distribution of retinal ganglion cells (RGCs) in two species of mysticete, Bryde’s whale (Balaenoptera edeni) and the humpback whale (Megaptera novaeanglia). Both species have large eyes characterised by a thickened cornea, a heavily thickened sclera, a highly vascularised fibro-adipose bundle surrounding the optic nerve at the back of the eye, and a reflective blue-green tapetum fibrosum. Using stereology and retinal whole mounts, we estimate a total of 274,268 and 161,371 RGCs in the Bryde’s whale and humpback whale retinas, respectively. Both species have a similar retinal topography, consisting of nasal and temporal areas of high RGC density, suggesting that having higher visual acuity in the anterior and latero-caudal visual fields is particularly important in these animals. The temporal area is larger in both species and contains the peak RGC densities (160 cells mm–2 in the humpback whale and 200 cells mm–2 in Bryde’s whale). In the Bryde’s whale retina, the two high-density areas are connected by a weak centro-ventral visual streak, but such a specialisation is not evident in the humpback whale. Measurements of RGC soma area reveal that although the RGCs in both species vary substantially in size, RGC soma area is inversely proportional to RGC density, with cells in the nasal and temporal high-density areas being relatively more homogeneous in size compared to the RGCs in the central retina and the dorsal and ventral retinal periphery. Some of the RGCs were very large, with soma areas of over 2,000 µm2. Using peak RGC density and eye axial diameter (Bryde’s whale: 63.5 mm; humpback whale: 48.5 mm), we estimated the peak anatomical spatial resolving power in water to be 4.8 cycles/degree and 3.3 cycles/degree in the Bryde’s whale and the humpback whale, respectively. Overall, our findings for these two species are very similar to those reported for other species of cetaceans. This indicates that, irrespective of the significant differences in body size and shape, behavioural ecology and feeding strategy between mysticetes and odontocetes (toothed whales), cetacean eyes are adapted to vision in dim light and adhere to a common “bauplan” that evolved prior to the divergence of the two cetacean parvorders (Odontoceti and Mysticeti) over 30 million years ago.

Eye Shape and Retinal Topography in Owls (Aves: Strigiformes)

2012 ◽  
Vol 79 (4) ◽  
pp. 218-236 ◽  
Author(s):  
Thomas J. Lisney ◽  
Andrew N. Iwaniuk ◽  
Mischa V. Bandet ◽  
Douglas R. Wylie
Keyword(s):  
Retinal Topography
Sign in / Sign up

Export Citation Format

Share Document