September 2016
Volume 57, Issue 12
Open Access
ARVO Annual Meeting Abstract  |   September 2016
Visual ecology of snakes: comparative study of the density and distribution of retinal neurons in diurnal and nocturnal species.
Author Affiliations & Notes
  • Einat Hauzman
    Psychology Institute, University of Sao Paulo, Sao Paulo, Brazil
    Hospital Albert Einstein, Instituto Israelita de Ensino e Pesquisa, Sao Paulo, Brazil
  • Daniela Maria Oliveira Bonci
    Psychology Institute, University of Sao Paulo, Sao Paulo, Brazil
    Hospital Albert Einstein, Instituto Israelita de Ensino e Pesquisa, Sao Paulo, Brazil
  • Dora Fix Ventura
    Psychology Institute, University of Sao Paulo, Sao Paulo, Brazil
    Hospital Albert Einstein, Instituto Israelita de Ensino e Pesquisa, Sao Paulo, Brazil
  • Footnotes
    Commercial Relationships   Einat Hauzman, None; Daniela Bonci, None; Dora Ventura, None
  • Footnotes
    Support  FAPESP 2008/58731-2; 2010/51670-8
Investigative Ophthalmology & Visual Science September 2016, Vol.57, 4667. doi:
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to Subscribers Only
      Sign In or Create an Account ×
    • Get Citation

      Einat Hauzman, Daniela Maria Oliveira Bonci, Dora Fix Ventura; Visual ecology of snakes: comparative study of the density and distribution of retinal neurons in diurnal and nocturnal species.. Invest. Ophthalmol. Vis. Sci. 2016;57(12):4667.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

Purpose : This study aimed to compare the density and distribution of photoreceptors and ganglion cell layer (GCL) cells in retinas of 20 species of snakes, from the Colubridae and Dipsadidae families and correlate the results with the activity pattern of the species.

Methods : The snakes were collected at Butantan Institute and euthanized with a lethal dose of thiopental. The eyes were enucleated and the retinas dissected (n=86). We used immunohistochemistry and Nissl staining techniques in wholemount retinas to quantify the density of photoreceptor and GCL cells. The spatial resolving power was estimated based on the peak density of GCL cells and posterior nodal distance of the eyes. We compared the average density of cell of diurnal and nocturnal snakes and applied t tests for independent samples.

Results : Diurnal snakes had lower density of photoreceptors compared to nocturnal (t = 6,18, p < 0,0001), but higher density of GCL cells (t = 2,88, p = 0,007) and spatial resolving power (t = -4,484, p < 0,0001) (Table; Figure). The distribution of cells had differences among diurnal and nocturnal species: diurnal snakes had a horizontal streak and nocturnal had an area centralis. The location of the area centralis varied according to the species habitat: in the dorsal retina for fossorial snakes (Atractus sp), in the ventral region for arboreal (Dipsas sp) and in the central region for terrestrial (O. guibei).

Conclusions : The results of this study point to the strong influence of the circadian rhythm of snakes in the density and distribution of retinal neurons. The region of peak density is associated with the species habitat and ecology.

This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.

 

 

×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×