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Orientation of the Painted Turtle, Chrysemys picta
Edward P. Ortleb and Owen J. Sexton
The American Midland Naturalist
Vol. 71, No. 2 (Apr., 1964), pp. 320-334
Published by: The University of Notre Dame
Stable URL: http://www.jstor.org/stable/2423290
Page Count: 15
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Thirty adult female Chrysemys picta were tested in a Y-maze to determine what factors caused orientation. The turtles were found not to have any innate (or to develop any right or left) turning tendencies. At warm temperatures (23 - 30C) the turtles did not orient to current or to different strengths of currents. When kept at 6C for 24 hours prior to testing, there was a marked tendency to avoid current. The turtles had a marked orientation to light and responded positively to differences of 0.1 ft-c in intensity. Chrysemys kept at temperatures of 6 to 17C prior to testing oriented to warmer water currents. When kept at warmer temperatures ranging between 23 and 20C, they oriented to cooler water currents. The turtles did not orient to a current bearing aromatics from aquatic plants. There was no significant orientation to currents having red, green, or brown dye introduced.
The American Midland Naturalist © 1964 The University of Notre Dame