While Few Noticed, Hawaiian Lizard Went Extinct


Copper-striped blue-tailed skink.: Credit: Chris Brown, USGS.

Copper-striped blue-tailed skink: Chris Brown, USGS. 

A species of lizard native to the Hawaiian Islands—the copper striped blue-tailed skink (Emoia impar)—is now officially extinct. The species was once common throughout the Hawaiian Islands and is still found on other island groups in the tropical Pacific.

But the last confirmed sighting in the state of Hawaii was on the Na’Pali coast of Kauai in the 1960s. Repeated field surveys between 1988 and 2008 on Kauai, Oahu, Maui, and Hawai’i yielded no evidence of their existence.

The authors of a new paper in the science journal Oryx write that this is a case of a cryptic extinction—that is, when a species easily confused with a similar species goes missing for decades and no one notices. From the paper:

The introduction and spread of a similar skink Lampropholis delicata across the islands appears to temporally follow the decline of Emoia impar, although there is no evidence of competition between these species. It appears that  Lampropholis delicata is spreading to occupy the niche vacated by the extirpated Emoia impar. Further confusion exists because the skink Emoia cyanura, which is very similar in appearance to Emoia impar, appears to have been introduced to one site within a hotel on Kaua’i and persisted as a population at that site for approximately 2 decades (1970s–1990s) but is now also extirpated. 

Big-headed ant (Pheidole megacephala): April Nobile / © AntWeb.org / CC-BY-SA-3.0 via Wikimedia Commons.

Big-headed ant (Pheidole megacephala): April Nobile / © AntWeb.org / CC-BY-SA-3.0 via Wikimedia Commons. 

So what was the driver behind this extinction? It remains something of a mystery, though there are hints that predation by invasive ants was a factor. The authors write:

A review of the plausible causal factors indicates that the spread of the introduced big-headed ant Pheidole megacephala is the most likely factor in this lizard decline… This study highlights the cryptic nature of this early species extinction as evidence that current biogeographical patterns of non-charismatic or enigmatic reptiles across the Pacific may be the historical result of early widespread invasion by ants. 

 

THE TRUTH...

is the first thing despots go after. An unwavering commitment to it is probably what draws you to Mother Jones' journalism. And as we're seeing in the US and the world around, authoritarians seek to poison the discourse and the way we relate to each other because they can't stand people coming together around a shared sense of the truth—it's a huge threat to them.

Which is also a pretty great way to describe Mother Jones' mission: People coming together around the truth to hold power accountable.

And right now, we need to raise about $400,000 from our online readers over the next two months to hit our annual goal and make good on that mission. Read more about the information war we find ourselves in and how people-powered, independent reporting can and must rise to the challenge—and please support our team's truth-telling journalism with a donation if you can right now.

payment methods

THE TRUTH...

is the first thing despots go after. An unwavering commitment to it is probably what draws you to Mother Jones' journalism. And as we're seeing in the US and the world around, authoritarians seek to poison the discourse and the way we relate to each other because they can't stand people coming together around a shared sense of the truth—it's a huge threat to them.

Which is also a pretty great way to describe Mother Jones' mission: People coming together around the truth to hold power accountable.

And right now, we need to raise about $400,000 from our online readers over the next two months to hit our annual goal and make good on that mission. Read more about the information war we find ourselves in and how people-powered, independent reporting can and must rise to the challenge—and please support our team's truth-telling journalism with a donation if you can right now.

payment methods

We Recommend

Latest

Sign up for our free newsletter

Subscribe to the Mother Jones Daily to have our top stories delivered directly to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.

Subscribe

Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.

Donate