The morphology and density distribution of the cone photoreceptor in the retina of the atlanta stingray, dasyatis sabina

Abstract

A histological analysis of the retina of the stingray, Dasyatis sabina, revealed the presence of two distinct photoreceptor morphologies. Based upon morphological evidence and literature descriptions it was decided that the two morphotypes represented the rod and the cone photoreceptor. By performing differential counts in multiple regions and expressing cones as a percent of the total number of photoreceptors present, it was possible to determine the cone density through out the retina. Density varied with the location of the retina at which the count had been made. The cone distribution followed two progressive patterns. The density of cones would decrease as ~aunts were taken from the optic disc to the ora serrata and, in those sections which were taken from the rostral and caudal quadrants, a difference in cone density was determined between regions from the same section of tissue. ANOVA testing of these differences determined them to be significant. The pattern of cone distribution was also found to be consistent in all ages and in both genders of this species.

Notes

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Graduation Date

1990

Semester

Summer

Advisor

Laird, Robert J.

Degree

Master of Science (M.S.)

College

College of Arts and Sciences

Department

Biological Sciences

Format

PDF

Pages

103 p.

Language

English

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0027322

Subjects

Arts and Sciences -- Dissertations, Academic; Dissertations, Academic -- Arts and Sciences

Accessibility Status

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