- Anolis carolinensis from http://www.mascotissimo.com/wp-content/uploads/2008/02/anolis_carolinensis.jpg
A few years ago, Richard Tokarz and colleagues conducted a series of studies in which he surgically disabled the dewlaps of some male A. sagrei and discovered that these functionally dewlapless lizards had no trouble holding a territory and seducing females. In a new study, Henningsen and Irschick found that surgically reducing the size of dewlaps in male A. carolinensis by about one-third had no effect on male-male aggressive interactions in the lab. Makes one wonder what’s the big deal about having a dewlap.
Professor of Biology and Director of the Living Earth Collaborative at Washington University in Saint Louis. I've spent my entire professional career studying anoles and have discovered that the more I learn about anoles, the more I realize I don't know.
Latest posts by Jonathan Losos (see all)
- New Article on Anolis roosevelti and the Question of Its Survival - March 16, 2024
- Lizard Diving Champions: Trading Heat For Safety Underwater - March 15, 2024
- Do Large Brown Anoles Get the Most Mating Opportunities? - January 6, 2024
Rich Glor
As provocative as these results are, we should be careful with over-interpreting their implications. The Tokarz studies, for example, included only a small number of individuals observed over a relatively short duration. If I remember correctly, the males were also replaced in territories that they had previously established when their dewlaps were intact. Certainly an interesting starting point for additional work!
George Merlot
Outstanding! You actually went to the trouble of surgically reducing the size of dewlaps in male A. carolinensis by about one-third! This raises several questions:
1) how did you decide on the fairly specific proportion of reduction of “about one-third”?
2) do you think it is valid to generalise from this research to dewlap reductions of, say, round-about-a-half, more-or-less-three-eights, or give-or-take-five-twelfths?
3) is it possible that the chinless A. sagrei carry their reduced or disabled dewlaps like duelling scars, thus what could be seen as a disfigurement in fact lends them an air of mystery and danger which could prove impressive and intimitading in male-male interactions and dowright sexy to the lady lizards?
4) what might the effects on agressive male-male interactions, or indeed success in securing a mate be of surgically reducing other A. sagrei parts by about one-third? For example pruning the tail or lopping off 6 or 7 toes?
5) has any research been done comparing and contrasting the lizard dewlap with the frat-boy eyebrow? A priori, both study groups seem to suffer similarly little loss of function despite reductions of about one-third resulting from vexatious surgical interventions.
6) what on Earth do you get up to when you’re not operating on lizard dewlaps?
Maxine G Runkle
I view the anoles everyday here in Florida . I talk to them and I especially like that Red, Dotted, fan-like body part they exude from under their chin. Not sure why they do this or when, but they are Beautiful….