Author: Jonathan Losos Page 110 of 131

The cavalcade of new anole species continues with Gunter Köhler’s description of a new species, related to A. altae, from Costa Rica. The last few years have seen a steady progression of new species descriptions, almost all from Central and South America. Anolis must be pushing 400 species by now. Anyone got an up-to-date total?

And who’s described all these species? Rich Glor is in the midst of a five-part series identifying the big guns in Caribbean island species descriptions, but I reckon the mainlanders have been described by a very different crowd. Certainly in recent times Köhler, Poe and others must be up there, but it would be interesting to see who historically has been the most prolific. Perhaps a job for someone from Team Norops?

In any case, down to the nitty-gritty. What used to be known as A. altae has been divided now into seven allopatrically-distributed species at high elevations in Costa Rica.

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Polymorphism in dorsal patterns of female Anolis humilis. Color version of photo in Parmelaere et al., Biol. J. Linn. Soc. (2001), courtesy E. Parmelaere.

The topic of female dorsal pattern polymorphism has been broached several times in Anole Annals posts. Such polymorphism occurs in some species and not others; a comprehensive survey by Paemelaere et al. demonstrated that it was much more common in mainland anoles than in island species, and in some clades more than in others.

But the bigger question is: does dorsal pattern matter to the ladies?

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Geographic range of natural and introduced populations of Anolis sagrei. From Angetter et al. (2011).

The Cuban brown anole, Anolis sagrei, is indisputably the most successful of all Caribbean anoles. Not only is it found throughout almost all of Cuba at low elevations, but also everywhere in the Bahamas, on many islands in western Cuba, and even on the coast of Central America. Not surprisingly given its natural colonizing ability, the brown anole is the anole most widely introduced by humans as well, now established not only in Florida, but also on many islands in the Caribbean, as well as Taiwan, Hawaii and, most recently, Costa Rica.

What is surprising is how widely the brown anole has spread in North America. As the map above indicates, invasive populations have moved to areas much farther north than the species’ most northerly outpost in the Bahamas. One would think that Cuban anoles—or even Bahamian ones—would not be adapted to conditions in Georgia because environmental conditions are so different from those in Cuba.

To examine this idea, Angetter et al. conducted a species distribution modeling exercise to compare the environmental conditions that characterize the brown anole’s native range with that of its introduced range.

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