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Lizards shout against a noisy background to get points across
Male Anole lizards signal ownership of their territory by sitting up on a tree trunk, bobbing their heads up and down and extending a colourful throat pouch. They can spot a rival lizard up to 25 meters away, says National Science Foundation (NSF)-funded biologist Terry Ord of the University of California at Davis. Ord and colleagues published their results this week in the journal Proceedings of the Royal Society B.
The lizards' signals need to be strong enough for a rival to see, but not vivid enough to interest predators. Their forest homes, however, can be 'visually noisy' environments, with branches and leaves waving in the breeze. 'They have to have a strategy to get their message across,' Ord says. 'We all know that people speak more loudly in a noisy party,' says John Byers, program director in NSF's division of organismal systems. 'These researchers have shown that lizards can do the same. We are only beginning to understand how perfectly adapted the behaviour of animals can be.' Ord videotaped two species of Anole lizards, Anolis cristatellus and Anolis gundlachi, in the Caribbean National Forest of Puerto Rico. He found that the more 'noise' in the background, the faster and more exaggerated the movements of the lizards.
Anole lizards are interesting to evolutionary biologists because different species are found on different islands throughout the Caribbean. The lizards are not closely related - they are separated by 30 million years of evolution - but they live in similar environments with the same obstacles to communication.
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