You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Defensive Behavior in the Galapagos Tortoise (Geochelone elephantopus), with Comments on the Evolution of Insular gigantism
Floyd E. Hayes, Kent R. Beaman, William K. Hayes and Lester E. Harris, Jr.
Vol. 44, No. 1 (Mar., 1988), pp. 11-17
Stable URL: http://www.jstor.org/stable/3892193
Page Count: 7
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
Defensive behavior of the Galapagos tortoise (Geochelone elephantopus) was studied at Volcan Alcedo, Isabela Island, Galapagos Islands, Ecuador. The tortoises exhibited a variety of distinctive behavioral responses during and following the approach of an investigator. Withdrawal distances and subsequent protrusion latencies were not appreciably affected by body size or age. Because Galapagos tortoises have retained a defensive behavioral repertoire similar to that described in turtles from continental areas, we reject the hypothesis that the loss, reduction, or modification of antipredator strategies in island tortoises contributed to the development of gigantism. Rather, insular gigantism probably evolved from factors related to ecological conditions.
Herpetologica © 1988 Herpetologists' League