This film explores the adaptation of anole lizards (genus Anolis) to habitats common across the islands of the Caribbean. The anoles are excellent examples of adaptive radiation, convergent evolution, and speciation through reproductive isolation. Show Working in the islands of the Caribbean, biologist Jonathan Losos discovered traits that enable dozens of anole species to live in different vertical niches in the forest. Differences in limb length, body shape, and toepad size reflect adaptations to life on the ground, on thin branches, or high in the canopy. Remarkably, similar combinations of these traits have evolved independently on different islands, a phenomenon known as convergent evolution. The film also describes how new species of anoles are formed due to variations in the color of their dewlaps, a reproductive trait that determines their mating behavior. The “Abbreviated Film Guide” provides a short summary of the film, along with key concepts and connections to curriculum standards. An audio descriptive version of the film is available via our media player. What evidence indicates that the same types of anoles evolved independently on different islands?DNA sequencing data indicates that lizards on each island tend to be more closely related to each other than to similar species on other islands, indicating that the same types of anoles evolved independently on different islands. Evolution can repeat itself in similar habitats.
Why are there so many species of anoles and how did they evolve?Despite these differences, all have evolved from the same ancestor as lizards. Spreading through the Americas, one lizard group, the anoles, evolved like Darwin's finches, adapting to different islands and different habitats on the mainland. Today there are more than 400 species.
How did anole lizards evolve?Note the lizard's toe pads. Over just 20 generations in 15 years the green anoles evolved larger toe pads equipped with more sticky scales to allow for better climbing (photo 2). The change came after the invasive brown anoles (photo 3) forced them from their ground-level habitat into the trees in order to survive.
How the different species of anole on an island demonstrate?Explain how the different species of anoles on an island demonstrate "resource partitioning" similar to the warblers in the figure. The anoles spereate and inhabit separate areas of their environment similar to the way the warblers divided up sections of the tree based on where the organisms will survive best.
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What does the evidence suggest regarding the evolution of body types of anole lizards on the different islands?
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