عنوان

Visual Acuity of Juvenile Loggerhead Sea Turtles (Caretta caretta): A Behavioral Approach

Number

LA9vw0g6bt

.Language of Text, Soundtrack etc

انگلیسی

Title Proper

Visual Acuity of Juvenile Loggerhead Sea Turtles (Caretta caretta): A Behavioral Approach

General Material Designation

[Article]

First Statement of Responsibility

Moein Bartol, Soraya; Mellgren, Roger L.; Musick, John A.

Text of Note

Studies focusing on the visual cues sea turtles use to orient between the nesting site and the sea indicate that sea turtles use diffuse images for orientation and are highly myopic on land. The visual environment encountered by sea turtles, however, is very different in water than on land. In this study, operant conditioning techniques were used to explore the visual acuity of juvenile loggerhead sea turtles (Caretta caretta) in the marine environment. Turtles were trained, in a tank setting, to distinguish between a 45 mm striped panel and 50% gray panel by using squid as a food reward. Though the pace of training was limited by our guidelines for holding these animals in captivity and the amount of food we could give each animal in a week, all turtles were trained in under a month. Once training was achieved, the stripes were reduced in size (stripe width ranging from 45.0 - 0.035 mm) until the turtle chose the striped panel over the 50% gray panel based on chance; this level of choice was designated as threshold. Mean acuity threshold level for all turtles tested was found to be 0.078 (visual angle of 12.89 minutes of arc). These results are similar to those of other marine species and indicate that loggerhead sea turtles use distinct visual cues in the aquatic environment.

Date of Publication

2003

Title

International Journal of Comparative Psychology

Volume Number

16/2

Entry Element

Moein Bartol, Soraya; Mellgren, Roger L.; Musick, John A.

Electronic name

[Article]

275578

a

Y