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- Title
Retinal topography and visual acuity in the riverine tucuxi (Sotaliafluviatilis)
- Authors
Mass, Alla M.; Supin, Alexander Ya.
- Abstract
The distribution and size of ganglion cells in the retina of two tucuxi were investigated. Retinal cell size varied from 10 to 50 mu m with a polymodal size distribution; major groups were seen with sizes of 8-20, 21-35, and more than 35 mu m. Ganglion cells concentrated at two spots of the highest density in the nasal and temporal quadrants,about 10 mm (60 deg.) from the optic disk. The mean peak cell density in both spots was 188-198 cells/mm2 . With a posterior nodal distance of 9.5-10 mm (underwater), the density at those two spots corresponded to 5.4-5.7 cells/deg2 , which provides a retinal resolution of 25'-26' (1.16-1.19 cycle/deg) in water and 33'-34' (0.9 cycle/deg) in air.
- Subjects
VISUAL acuity; MARINE mammals
- Publication
Marine Mammal Science, 1999, Vol 15, Issue 2, p351
- ISSN
0824-0469
- Publication type
Article
- DOI
10.1111/j.1748-7692.1999.tb00806.x