A full advertisement call in the tokay gecko (Gekko gecko) is made up of two phases. The first phase consists of 2–3 successive rattles of increasing intensity. The second phase contains a series of 4–11 binotes (mean 6.5), each of which sounds like “gerjai”. All rattles and binotes have the same fundamental frequency of about 100 Hz (90–115Hz). A rattle has a dominant frequency of 835 Hz with almost all energy density below 4 kHz. The first note of each binote contains 11 distinct harmonics with varying dominant frequency. The dominant frequency and harmonics in the second note of the binote gradually vary from the first binote to the last one. Advertisement calls of tokay geckos show diel cycles and seasonal variations. Light and ambient temperature strongly affect the vocal activity in both field and laboratory. The frequency of advertisement vocalization increases in late spring in parallel with the rise of androgen levels and gonadal masses.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 2001 • No. 1