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The Best-Vision Zones and Visual Resolution of the Retina of Neonatal Bottlenose Dolphins Tursiops truncatus

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Abstract

The topography of ganglion cells in the retina of three neonatal bottlenose dolphins Tursiops truncatus has been studied in retinal wholemounts. Two areas of high ganglion cell density have been identified in the form of local spots in the temporal and nasal quadrants of the retina, near a horizontal diameter at a distance of 10–15 mm from the optical disk. The maximum density of ganglion cells in these areas on average for five preparations is 657 and 636 cells/mm2 in the temporal and nasal quadrants, respectively. The retinal resolution, estimated by the maximum density of ganglion cells and a posterior nodal distance of 13 mm, was 0.17° for the temporal quadrant and 0.18° for the nasal one. These data are comparable with the results for the previously studied adult dolphin and whale species.

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ACKNOWLEDGMENTS

The authors are grateful to L.M. Mukhametov, V.V. Popov, E.S. Rodionova, E.V. Sysueva, and all stuff for their assistance in obtaining morphological material.

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Authors and Affiliations

  1. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, Russia

    A. M. Mass & A. Ya. Supin

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  1. A. M. Mass
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  2. A. Ya. Supin
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Correspondence to A. M. Mass or A. Ya. Supin.

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The authors declare that they have no conflict of interest. This article does not contain any studies involving living animals or human participants performed by any of the authors.

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Translated by T. Kuznetsova

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Mass, A.M., Supin, A.Y. The Best-Vision Zones and Visual Resolution of the Retina of Neonatal Bottlenose Dolphins Tursiops truncatus. Dokl Biol Sci 490, 1–4 (2020). https://doi.org/10.1134/S0012496620010044

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  • DOI: https://doi.org/10.1134/S0012496620010044

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