Last summer I
posted a picture of Anolis lineatopus that
illustrated why accounting for transmission is critical when addressing
questions related to signal detectability. Considering transmission is
particularly important in the case of signals, such as the dewlap, for which
transmission contributes greatly to the "perceived" brightness of the
signal and the sudden increase in brightness, which is known as the "Gelb
Effect". The dewlap of Anolis acutus
is also a great example of the "Gelb Effect" as illustrated by the
picture below. In A. acutus, the
effect is even more dramatic because the white region of the dewlap is at least
twice as transmissive as the yellow/orange portion of the dewlap.
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