What factor contributes to the fixation of different color characteristics in isolated demes of Sphaerodactylus species?
Answer
Localized environmental differences and camouflage needs
Coloration in these geckos is often subject to strong selection pressures, particularly for camouflage against specific substrates. Isolated populations often experience unique environmental conditions, such as different soil colors, variations in lichen growth on rocks, or changes in the light penetration of the understory vegetation. Over time, these localized factors drive the fixation of color morphs that best hide the geckos from predators, leading to slight variations in appearance between populations separated by geographic barriers.
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