Author: Jonathan Losos Page 19 of 130

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.

Colonization and Adaptation of Japanese Island Green Anoles

A female green anole from Hahajima in the Osagawara Islands.

We’ve had a series of posts about the anoles of the Osagawara Islands, of Japan, the “Galápagos of the Orient” [1, 2]. Now a new paper (pdf here) from Masakado Kawata’s lab has resequenced genomes of multiple individuals and measured morphology to assess how large the founding population was and what sorts of morphological changes have occurred since colonization, as well as identifying some genes potentially under selection.

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Here’s the abstract:

Invaded species often can rapidly expand and establish in novel environments through adaptive evolution, resulting in devastating effects on native communities. However, it is unclear if genetic variation at whole-genomic levels is actually reduced in the introduced populations and which genetic changes have occurred responding to adaptation to new environments. In the 1960s, Anolis carolinensis was introduced onto one of the Ogasawara Islands, Japan, and subsequently expanded its range rapidly throughout two of the islands. Morphological comparison showed that lower hindlimb length in the introduced populations tended to be longer than those in its native Florida populations. Using re-sequenced whole genomic data, we estimated that the effective population size at the time of introduction was actually small (less than 50). We also inferred putative genomic regions subject to natural selection after this introduction event using SweeD and a method based on Tajima’s D, π and FST. Five candidate genes that were potentially subject to selection were estimated by both methods.The results suggest that there were standing variations that could potentially contribute to adaptation to nonnative environments despite the founder population being small.

Another Great Anole Journal Cover

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Looks like it’s time for an updated compilation of anole covers! This one’s from the December 2017 issue of Mesoamerican Herpetology. Here’s what they have to say:

Javier Sunyer is a Spanish herpetologist who has lived in the Neotropics for the last 20 years. His work includes over 80 scientific papers and notes, dealing mostly with the distribution, natural history, and conservation of the Nicaraguan herpetofauna. Currently, he is a Research Associate at the Universidad Nacional Autónoma de Nicaragua-León (UNAN-León) and an Associate Editor/Section Editor for Mesoamerican Herpetology. Pictured on our cover is an image of Kempton’s Anole (Norops kemptoni), photographed in January 2006 at Alto Chiquero, Parque Nacional Volcán Barú, Provincia de Chiriquí, Panama. Adult males are territorial, and often display their colorful dewlap to intruders.

Anolis wattsi Expanding its Range in Trinidad

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A, wattsi is one of five introduced species on the islands. A new report in Living World: the Journal of the Trinidad and Tobago Field Naturalists’ Clubindicates that it’s on the move.

Anole Calendars 50% Off through January 11

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The Location of the (Neo)Type Specimen of Anolis carolinensis

Bryan Stuart, Curator of Herpetology at the North Carolina Museum of Natural Sciences in Raleigh, recently posted this on Facebook:

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And an important comment on the FB post from Jeff Beane, the department’s collections manager:

“And the neotype of Anolis carolinensis is now NCSM 93545.”

Spiders Eating Anoles and Frogs

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What a horrible way to go! We’ve reported on this before [e.g., 1, 2, 3], but not Folt and Lapinski have published a nice review in Phyllomedusa of wandering and orb weaver spiders eating frogs and lizards in Costa Rica.

The Brown Anole: A Proud Texan

From the pages of the San Angelo Standard Times:

Wild About Texas: Brown anole got to Texas as fast as it could

Living in the day and age where memes on social media are the prevailing means of communication does have a FEW benefits. I can almost always count on having a good laugh daily at something someone has posted.

Just the other day, I saw a meme that stated, “I was not born in Texas, but I got here as fast as I could!” As a naturalist, all I could think about when I saw this posted was one particular species of lizard that has found its way here, and that species is the brown anole.

The brown anole (Anolis sagrei) is one of two species of anoles that currently reside in Texas, but this species is not native to this state. First established near Houston in the 1970’s, this species was known only from areas around Houston, San Antonio and Brownsville as late as the turn of the century.

However, now it can be seen in and among most metro areas within an imaginary triangle that pinnacles in the DFW area, east of I-35 and west of I-45. It has only recently been observed (2016) in the Metroplex, and there have not been enough observations to verify whether there is a breeding population there or not. Even more recently, a smattering of individuals had been reported from a nursery in the city limits of Midland and these observations have been verified.

Originally native to the Bahamas and Cuba, this species has been introduced and is thriving in areas outside of Texas as well. It is arguably the most common lizard observed throughout the southern 2/3 of Florida, and it can also be seen throughout the eastern seaboard of Mexico.

The habitats that this invasive lizard prefers are settings in densely vegetated areas. Although occasional specimens are discovered basking and foraging in short shrubs and trees, the vast majority of sightings are of individuals in terrestrial settings. It is the propensity for living among ornamental plants and shrubs that has enabled this species to thrive in the warmer climates outside of its natural range. Therefore, many Brown Anoles are observed living around landscaped human habitations such as houses and even businesses.

The brown anole is among the most plainly colored and yet most intricately patterned lacertilian species in the United States. Unlike the native green anole (which can vary in coloration from green to tan to brown), this anole is always a shade of brown. The scales on the back are small and granular in appearance and texture, and females are often plainly patterned, adorned only with a light stripe that runs lengthwise down the spine. Males on the other hand are patterned with an intricate array of lightly outlined dark wedges and blotches along the spine.

Both species have varying amounts of dark striping that extends behind the eyes. Males have a brightly colored dewlap that, when extended, is dark red. The limbs are long, and are often colored patterned with dark stripes or bands. The head is not nearly as elongated like the green anole and is not noticeably separated from the body, and the tail, which is colored like the back, is about one-half of the 8-inch total length.

Brown anoles, like other lizard species, are “cold-blooded”, or ectothermic. This means that it does not generate heat from the inside of their body, as mammals and birds do, but rather is dependent on outside sources for heating and cooling. It is active during the early mornings and late afternoons from early April to October, and like many other reptile species it avoids the hottest part of the day by resting in shaded areas. However, the fact that it resides primarily in tropical areas, it is often active throughout the year.

This species of lizard is an opportunistic carnivore, feeding primarily on small insects such as moths, butterflies, crickets, grasshoppers, beetles, and the like.

The brown anole is oviparous, which is a fancy way of saying that it lays eggs. During the breeding season, which typically begins in early spring and extends into late summer, males will attempt to attract females by extending his bright red dewlap (a flap of skin underneath the chin) while bobbing his head up and down in a “push-up” manner.

Following successful copulations, the female will begin to lay clutches of a single egg. By laying an egg about every two weeks, a female can lay as many as 12 eggs in a season. These eggs are laid in areas of high humidity, and typically will hatch in about five weeks. The two-inch long hatchlings are smaller imitations of the female, and are capable of fending for themselves immediately.

This lizard species is a gregarious basker and will often allow people to get rather close as it relies upon its coloration for protection. However, once it feels an intruder has approached too close for comfort, it will quickly dart for cover among the leaf litter.

Michael Price is owner of Wild About Texas, an educational company that specializes in venomous animal safety training, environmental consultations and ecotourism. Contact him at wildabouttexas@gmail.com.

60% Off Anole Calendars til Midnight Tonight!

 

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Night Time Activity by the Brown Anole in Guatemala

Night time’s not just for sleeping in the festive anole.

Everyone knows that anoles are diurnal, active by day and snoozing by night. Yet the rascals are opportunistic–light up the night, and they’ll take advantage to extend their carousing and foraging. We’ve had reports on such behavior before [1, 2] in the green and knight anoles (and there are more reports in the literature); now such behavior is reported in the brown anole from Guatemala, in a recent paper by Brown and Arrivillaga published recently in Mesoamerican Herpetology.

Sneak Preview of New Smithsonian Channel film on Anolis Lizards

From the Harvard Museums of Science and Culture webpage:

Film Screening: Sneak Preview of Laws of the Lizard + Q&A with Filmmakers

Date:

Monday, December 11, 2017, 6:00pm

Location:

Geological Lecture Hall, 24 Oxford Street

People holding lizard

When scientists ask big questions about the laws of nature, they sometimes seek out improbable partners—such as lizards—to find the answers. In their new documentary, Laws of the Lizard, award-winning filmmakers Nate Dappen and Neil Losin partner with scientists to tell the surprising story of anole lizards.

During a year-long quest that took them from tiny Bahamian islands and Caribbean rainforests, to metropolitan Miami, Dappen and Losin capture cutting-edge science, new anole species, and never-before-seen behaviors. They quickly came to understand why Jonathan Losos, Harvard evolutionary biologist—and anole lizard expert—humorously says “Any study you do is more interesting if you do it on anoles!”

Join us for a special preview screening of Laws of the Lizard—coming to the Smithsonian Channel in 2018—followed by a Q&A with the filmmakers and Harvard Professor Jonathan Losos.

Film Screening (51 minutes)

Free parking is available at the 52 Oxford Street Garage

Free and open to the public

Page 19 of 130

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