Author: Jonathan Losos Page 125 of 133

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.

Great Tales of Florida Anoles

By Jonathan Losos

On May 5, 2011

In Introduced Anoles, Natural History Observations

From Dust Tracks on the Web

In a recent post, AA mentioned Janson Jones’ (Dust Tracks on the Web) report on catching a magnificent knight anole. Turns out that Jones is not only a kindred spirit, but a keen observer and an excellent photographer. Over the course of the last few days, he has posted a series of stories of observations of Florida anoles that are worth checking out.

Just a few comments. In “Clash of the Anole Titans” (photo above), he tells of a territorial battle between two male green anoles. Ultimately, the fight concludes when one male loses his grip and falls to the ground. Those who study the functional capabilities of anoles are always surprised at the great sticking ability of the anole toepad, much greater than is needed to support the lizard’s body weight (anoles can hang from a single toe!). Perhaps this ability has evolved, not for every day living, but for exceptional circumstances, such as prolonged, hand-to-hand combat or hanging on to a mini-van.

Luke Mahler Wins Fisher Prize

By Jonathan Losos

On May 3, 2011

In Anoles and Anolologists in the News

The Society for the Study of Evolution gives the R.A. Fisher Prize “for an outstanding Ph.D. dissertation paper published in the journal Evolution during a given calendar year.” This year’s awardee is Luke Mahler, for the paper, which appeared on the cover of the Sept, 2010 issue of Evolution: Mahler, D.L., L.J. Revell, R.E. Glor, and J.B. Losos. 2010. Ecological opportunity and the rate of morphological evolution in the diversification of Greater Antillean anoles. Evolution 64:2731-2745.

The Fisher Prize is relatively young, but already boasts an impressive list of past winners, to which Mahler is a worthy addition:

2006 Maurine Neiman

2007 Guillaume Martin

2008 R. Brian Langerhans

2009 Megan Higgie

2010 Britt Koskella

2011 D. Luke Mahler

Anoles in the Blogosphere

By Jonathan Losos

On April 28, 2011

In All Posts

It turns out that Anole Annals isn’t the only member of the WordPress.com stable that has a thing for our favorite lizard. While recently doing some tag surfing, we came across the following posts.

Catholic mom tells the gripping (or not) story of a green anole that went for a ride on the minivan windshield. You can probably guess the outcome, but the photos are nifty.

Anoles, Speciation, and Forest Refugia

By Jonathan Losos

On April 27, 2011

In Classics from the Literature

Anolis nitens (formerly A. chrysolepis). Photo from http://www.sciencephoto.com/images/download_lo_res.html?id=907650178

Today I had a chat with an evolutionary biologist who specializes on the evolution of tropical forests. We were discussing the effect of climate change on the Amazon, and he first made the point that dire warnings about the Amazon are possibly slightly overstated. Yes, the rainforest may be in big trouble, but it’s not as if the trees will fall down and the area turn into barren desert. Rather, there are many dry-adapted tree species in South America, and they will probably take over, replacing wet forest with dry forest. Conversation then turned to what is known as the Pleistocene Refugia Hypothesis (PRH), the idea that during the ice ages, the climate became drier because so much water was locked up in glaciers. As a result, so the theory goes, rainforests were fragmented as the forest was replaced in many places by other habitats. As a result, a formerly widespread species might become isolated into multiple, unconnected populations. The PRH suggests that these isolated populations often evolved into different species, and the famously high species richness of the Amazon may be a result of high rates of speciation resulting from a series of cycles of forest contraction and expansion. The PRH, however, has fallen on hard times for a variety of reasons, and I think it is safe to say that most workers in the field no longer favor it. Nonetheless, my colleague averred that the hypothesis has been too hastily discarded; in his mind, the idea has been caricatured, and more reasonable versions of the idea have merit and deserve more attention.

Core areas of A. chrysolepis distribution in the Amazon. Map H from Vanzolini and Williams (1970)

Of course, this conversation immediately turned my mind to one thought: anoles! In particular, it reminded me of two significant, yet in recent years little read, papers on Amazonian anoles. The first was a 1970 monograph in Arquivos de Zoologia by Paulo Vanzolini, famed Brazilian herpetologist and samba composer, and Ernest Williams on the pan-Amazonian anole then referred to as A. chrysolepis, now known as A. nitens, and soon to be divided into several species (stay tuned to these pages for more on that as the story develops).

Anole Communal Nests

By Jonathan Losos

On April 26, 2011

In New Research

: An egg of Anolis lionotus. Photo courtesy Edgardo Griffith.

One day, years ago, I was collecting data on the behavior of the Jamaican twig anole, A. valencienni. As I was watching a female, to my surprise, she entered a hole in a tree trunk, and then emerged a little while later. To my amazement, I then saw another valencienni do the same thing! Overcome with curiosity, I approached the tree, peered into the hole, and spied to my astonishment a large number of what seemed to be anole eggs. I was not aware that communal nesting—in which multiple females lay their eggs in the same place—is known in a number of anole species, including A. angusticeps, A. bartschi, A. lucius and A. valencienni. The seminal work on the subject is still Rand’s 1967 Herpetologica paper.

A recent paper adds another species to the list of known communal nesters, the first from Central America of which I’m aware.

Now That’s a Schnoz–New Data on Anolis Maynardi

By Jonathan Losos

On April 24, 2011

In New Research

In the pantheon of anoles, Anolis maynardi has a special place as one of the funniest looking species around. To the casual observer it appears that someone has taken an A. carolinensis (to which A. maynardi is closely related), grabbed it by the tip of the snout, and pulled it forward. The purpose of this pincer-like proboscis, much more extreme in males than in females (which are smaller), is unknown. Indeed, until recently, just about everything about the species was unknown.

Anolis maynardi is endemic to the tiny island of Little Cayman. Remarkably, although visible in the distance, the nearby island of Cayman Brac does not harbor the species. At least naturally. In 1987, A. maynardi was reported at the Cayman Brac airport, most likely a beachhead resulting from a stowaway on an island-hopping airplane. Another survey in 1991 still found it only near the airport, and nothing further was known.

Anolis carolinensis Genome Paper Submitted

By Jonathan Losos

On April 23, 2011

In All Posts

The long awaited paper describing the genome sequencing of Anolis carolinensis was submitted for publication on Thursday. Containing seven figures and with 50 authors, the paper is an epic step forward in our understanding of anole genetics. Stay posted for updates as the story develops.

Now There’s a Book Cover!

By Jonathan Losos

On April 22, 2011

In All Posts

From the back cover: “Anolis lizards have been used in the development and testing of fundamental theories in ecology and evolution, and they have served as important models in behavioral ecology.” The cover photo is credited to Dan Warner.

Anole and Orchid Evolution–What Do They Have in Common?

By Jonathan Losos

On April 20, 2011

In All Posts

Figure 1 from Pauw (2006)

Anton Pauw of Stellenbosch University in South Africa writes:

“I am reading Lizards in an Evolutionary Tree and find it fascinating to see how many parallels there are with my one of my study systems, oil-secreting orchids. While the anoles have differentiated across a series of niches provided by a plant, the orchids have differentiated across a series of niches provided by an animal. The orchids segregate the body of the shared pollinator among them so that each places its pollen on a unique segment of the oil-collecting bee. Orchid speciation generally involves shifts between bee species (with placement site conserved), but some speciation also occurs through shift in pollen placement site within the bee , so that sister species occupy for example the first and second segment of the front leg respectively. Anyway, I thought that you too might find these parallels interesting, so I have attached two papers on the topic. I like the comparison of your Fig. 3.2 with Fig. 1 in the attached 2006 paper.”

The other paper is here. Incidentally, apparently no one has posted a picture of an anole sitting on an orchid on the internet.

Anoles Respond to Robotic Lizards

By Jonathan Losos

On April 17, 2011

In New Research

: Photo from Partan et al. (2011)

For about a decade now, several researchers have used remarkably realistic looking robotic lizards to study lizard behavior. A pioneer in this approach—especially with regard to studying anoles—is Terry Ord, now at the University of New South Wales. You can see videos of his robotic lizards, as well as clips of a variety of anole species displaying, on the Terry Ord Channel on YouTube (or read about his most recent work here). As you’ll see, these robots are very realistic, both in terms of appearance and motion pattern—they bob, pushup, and extend their dewlap just like a real anole. In fact, even when the rubber body of the lizard hasn’t been attached, the underlying struts move in a clearly anole-like fashion. Bottom line, at a distance, I think most humans would be fooled by a displaying robo-anole. And lizards seem to be fooled, too, because they clearly respond by displaying and approaching the robot—check out the videos and/or Ord’s papers. Or read the recent paper by Partan et al., which demonstrates that A. sagrei responds more to a robot giving the typical signature display than to one presening a different display occasionally given by a lizard in the population.

Just like audio playbacks which revolutionized the study of bird vocal communication, robotic lizards provide the opportunity to rigorously examine lizard behavior in a controlled and replicated manner. Many different questions could be examined, but one of particular interest concerns how anoles distinguish conspecifics from heterospecifics. By altering the display pattern—the timing and amplitude of headbobs, pushups, and dewlap extensions—and by altering the color and pattern of the dewlap, researchers have the ability to understand species-recognition. In turn, such an understanding may provide critical insight into how new species arise, because speciation is the result of changes that lead individuals to no longer recognize each other as conspecifics.