Author: Jonathan Losos Page 8 of 129

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.

Adopt a Reptile to Help Publish a Fabulous New Reptiles of Ecuador Book

 

The ace photographic herpetologists at Tropical Herping are at it again! After publishing several beautiful and extremely useful guides–The Amphibians and Reptiles of Mindo and Reptiles of Galápagos–they’re now taking on the entire herpetofauna of Ecuador. If you have any doubts about their photographic chops, check out this page on Ecuadorian anoles.

And you can help make this book a reality! I’ve already done my part by sponsoring a species, but you have to guess which one.

Now you can play a major role in the publication of the 🐍 Reptiles of Ecuador 🇪🇨 book. Choose one of Ecuador’s 483 species of reptiles and your name will be displayed as its official protector or guardian in the species’ online data sheet. Your donation will help fund the last four remaining expeditions needed to find the most elusive reptiles in the country as well as cover the majority of the editing and printing costs. Every little donation helps. Click here to find out more about how can you adopt a reptile.

Invasive Green Anole on Japanese Island Implicated in Butterfly Extinction

We’ve previously had posts about green anoles, Anolis carolinensis, introduced to the Ogasawara Islands, and the efforts to eradicate them. Now a report has implicated the anoles in the possible extinction of a butterfly species. Here’s an article from the japan times:

Blue Japanese butterfly endemic to Ogasawara Islands feared extinct

The Environment Ministry said Thursday that a species of small butterfly endemic to Japan’s southern islands is feared to have gone extinct because all artificially bred butterflies and worms of its type have died.

In the butterfly’s natural habitats, in the Ogasawara Islands some 1,000 km south of Tokyo, no individuals from the species have been confirmed since 2018, the ministry said.

Unless the blue butterfly measuring just over 1 cm long is found in the wild, it will be the first butterfly species native to Japan to go extinct.

The ministry believes that a decline in the butterfly population is at least partially attributable to foreign lizards on the remote islands.

Efforts to preserve the species, known as Celastrina ogasawaraensis, had been under way since 2005 by Tama Zoological Park in western Tokyo and also at a facility in Shinjuku Gyoen National Garden in the capital since last October.

But all of the butterflies and worms raised at these facilities died in July and earlier this month, the ministry said, adding that repeated inbreeding might have led to an accumulation of hazardous genes, ultimately causing death.

The small butterfly is currently categorized as endangered on the Environment Ministry’s Red List. The ministry is expected to decide whether the species should now be listed as extinct.

The Ogasawara Islands are known as the Galapagos Islands of Asia due to their unique flora and fauna after eons of separation from any continent.

While the remote islands are growing popular as a tourist spot for beautiful subtropical scenery and whale watching, limited access via a 24-hour ship voyage available only once once per week helps to preserve the wildlife and natural ecosystems.

The volcanic islands, now administered by the Tokyo Metropolitan Government, belonged to the United States after World War II before being returned to Japan in 1968.

Green Anole Eats Brown Anole

Four-year-old Dany Leffler noticed the goings-on in his backyard in Houston just minutes from downtown.

Down the hatch!

San Antonio Celebrates Its Green Anoles

From the pages of the San Antonio Express-News (August 12, 2020):

S.A.’s Common Critters: Nothing common about the green anole, San Antonio’s most common lizard

Sarah Baade practically considers anole lizards her personal gardeners. The green little reptiles have a knack for keeping her company at her San Antonio home while she tends to her front yard tomatoes and backyard squash, poking out their slender heads from under her plants to stare at her.

She calls it a mutually beneficial relationship. The anoles eat any pesky bugs, and Baade rewards them with a free drink whenever she waters her gardens.

But there’s something else these simpatico green thumbs share: The joy of silence.

“It’s kind of my peaceful quiet time,” said Baade, who works as an audiologist. “They are my peaceful, quiet companions when I’m gardening.”

Anole lizards, the most common lizards in and around San Antonio, may not make much noise, but they sure make an impression — especially now as we see them more often while we spend more time in and around the house. And take it from another anole fan, one who’s studied them for nearly 20 years, there’s nothing common about this so-called common lizard.

“I think they’re incredibly charismatic,” said Michele Johnson, a biology professor at Trinity University who runs the kid-friendly website, lizardsandfriends.org. “I think that they’re a really interesting lizard because they seem so familiar, and yet there’s still things about them that we haven’t figured out yet.”

Here are some familiar and not so familiar facts about the anole.

Tomato, tomato. Anole, anole. San Antonio is home to the Carolina anole (Anolis carolinensis), sometimes just referred to as the green anole.

Anole is pronounced “ah-NOH-lee”, though Johnson noted most scientists say anole like “ah-NOLE.” She doesn’t think there’s one right way to say the name.

Anoles range beyond the Carolinas. The Carolina anole is native to North America and ranges across the southeastern United States, from around the middle of Texas east and up through the Carolinas. The lizard prefers warm and moist environments with trees, though you’re sure to spot them just about anywhere else there’s foliage, from forests and roadsides to lawns and doorsteps.

It’s easy being green. The Carolina anole also is known as the green anole for its bright, verdant color. The anole can change color into shades of brown, but that doesn’t make it a chameleon. Chameleons are not found in the Americas. Rather, anoles belong to the iguana family of reptiles.

Hey, baby, do you like my camo? Yes, an anole’s ability to change color can help it blend in with its surroundings, which is great for hunting insects and avoiding predators. But most anoles change color as a sign of dominance or sexual attraction, rather than trying to blend in.

“We know for sure it’s not camouflage,” Johnson said. “There’s been several studies.”

Little green men and women. Male and female anoles look almost exactly alike save for two distinguishing features. The female often sports a white dorsal stripe along her back, while the male displays a larger throat fan, or dewlap, that’s bright red and three times the size of the female’s fan.

Long tails, short bodies, short life spans. Anoles range in size from 5 to 8 inches long, and more than half of that is tail. Anoles live only around two to three years in the wild. The lizards are popular pets though, and can live up to seven years in captivity.

Days spent in the trees. Anoles are diurnal, meaning they’re active in the daytime. They’re also arboreal, meaning they live in trees.

They really toe the line. Johnson noted anoles have big toe pads that allow them to cling to surfaces.

They also cut and run. An anole will shed its tail to escape a predator. The twitching limb serves as a distraction for the lizard’s escape. A new tail will grow back, though not as long or as colorful as the original.

A bug’s life for breakfast, lunch and dinner. Anoles eat all sorts of insects, including moths, crickets, ants and spiders.

Keep off the dudes’ turf. Male anoles are extremely territorial and will fight other males to preserve their areas for themselves.

Self-reliant hatchlings. A few weeks after mating, a female anole will lay her first egg, then lay another every other week until she reaches around 10 eggs. The hatchlings then emerge 30 to 45 days later. The babies must fend for themselves without mother or father to care for them.

“I know that they had babies in my front garden because I’ve seen the babies,” Baade said. “It’s cool to see them scurry around.”

The anole is one of the X-Men. The Marvel comic book character Anole is one of the lesser-known mutants to join the heroic X-Men. The openly gay young hero exhibits lizardlike traits and abilities, including green scaly skin and the power to grow back lost limbs.

A first in genome sequencing. As part of scientists’ efforts to better understand the evolution of various animals, the green anole was the first reptile to have its entire genome sequenced. Johnson said the lizard was chosen because it has a small body and a fast reproduction time — and it’s way easier to keep in a lab than, say, a crocodile or snapping turtle.

She noted that sequencing the green anole has since led to a better understanding of such processes as forming eggs and regenerating tails. Take that, GEICO Gecko.

Anolis Lizards that Colonize Islands without Other Anoles Lose Their Parasites and Thrive: Experimental Study in Panama

Anolis apletophallus. Photo credit: Dario – https://www.inaturalist.org/photos/31736257

From a press release from the Smithsonian Tropical Research Institute:

When the U.S. flooded Panama’s Chagres River valley in 1910, Gatun Lake held the record as the world’s biggest reservoir. This record was surpassed, but researchers at the Smithsonian Tropical Research Institute (STRI), who are now studying invading lizards on the tiny islands that dot the lake, discovered that islands with native lizards act as another kind of reservoir, harboring the parasites that control invaders. The study, published in the journal Biology Letters, is valuable experimental evidence that biodiversity is better, making ecosystems more resistant to invasion.

As part of another study to find out how many generations it takes for slender anole lizards (Anolis apletophallus) to adapt to climate change, a research team led by Christian Cox, a visiting scientist at STRI from Florida International University, and Mike Logan from the University of Nevada, Reno, transplanted lizards from the tropical forest on the mainland to the islands, which tend to be hotter and drier. Before the transplant, they did a general health check of the lizards that included counting the number of parasites (mites) on their bodies.

When they came back several times during the next two years to see how the lizards were doing in their new habitats, they recounted the number of mites.

“We found that on the islands with no resident species of anole lizard, the slender anole lizards that were transplanted to the islands lost their mites within a single generation, and the mites are still gone several generations later (up until the present),” Cox said. “Indeed, individual founding lizards that had mites during the initial transplant had no mites when they were later recaptured. In contrast, anole lizards that were transplanted to an island with another resident (native) species of anole lizard kept their mites for three generations, and some of the founders on the two-species island never lost their mites.”

“Our study turned out to be a large-scale experimental test of the enemy release hypothesis,” said Logan, who did this work as a three-year STRI/Tupper postdoctoral fellow. “Often, when an invasive animal shows up in a new place, all of its pathogens and parasites are left behind or do not survive, giving it an extra survival advantage in the new place: thus the term enemy release.”

The team also found that the two-species island had lower density and lower biomass per unit area of the invasive lizard species, indicating that the continued presence of the mites may be keeping their populations under control.

“Our study is a clear example of something that conservationists have been trying to communicate to the public for some time,” Logan said. “Diverse native communities sometimes function as ‘enemy reservoirs’ for parasites and diseases the keep down the numbers of invaders.”

Funding for this study was provided by the Smithsonian Institution, Georgia Southern University, the Theodore Roosevelt Memorial Foundation and the American Museum of Natural History.

Seminar This Thursday on How Behavior Both Drives and Impedes Evolution Featuring Anoles!

Behavior Is a Motor and a Brake for Evolution

Tyson Research Center Seminar Series

Thursday, July 23

4 pm Central Time

Tune in to the Seminar live here; or come back later and watch the archived version.

Anolis Evolutionary Genomics Webinar Available for Streaming

If you missed it in the theater (so to speak), you can now watch Anthony Geneva’s fabulous talk on anole genomics any time!

Here’s what it’s about:

Adaptation and speciation are largely responsible for the origin and maintenance of biological diversity but despite this central role in evolution, many fundamental questions about these interrelated processes remain. The adaptive radiation of Anolis lizards (anoles) is ideally suited for testing hypotheses about speciation and adaptation because they represent a replicated natural experiment. Anole species on the Greater Antilles that occupy similar ecological niches have independently evolved strikingly similar morphologies and behaviors. These ecomorphs have been the focus of decades of detailed analyses which strongly support the adaptive nature of this convergence. Nevertheless, we lack a clear understanding of how morphological adaptation contributes to speciation and we know virtually nothing about the genetic basis of these convergent traits.

In this webinar, Dr. Geneva presents ongoing research in his lab using anole genomes to investigate the processes of adaptation and speciation. He will detail the development of genomic resources for anoles including nine highly complete and contiguous reference genome assemblies and discuss NSF-funded plans to understand the genetic basis of morphological convergence in this group.

Here Are the Anolis allisoni in the Grass

Back when this was originally posted in 2012, some viewers claimed to have seen a sixth anole. I can’t find it, but maybe you can!

Milk Snake Eats Introduced Brown Anole in Mexico

Photo by Víctor Vásquez-Cruz

Read all about it in this new paper, available online: Víctor Vásquez-Cruz. 2020. New prey records for the Atlantic Central American Milksnake Lampropeltis polyzona (Serpentes: Colubridae). Phyllomedusa  19(1):107–111.

Sign Up for Bahamas Reptiles Webinar

Here’s the registration page.

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