A new species of giant tortoise

New giant tortoise species found in Galápagos Archipelago

UBC professor part of research team that identifies new, vulnerable species

  • Oct. 25, 2015 11:00 a.m.

And then there were two.An international team of scientists has discovered there are actually two species of giant tortoises living on Santa Cruz Island in the centre of the Galápagos Archipelago. Until now, it was assumed that the two giant tortoise populations on the island were of the same species, just living on different sides of the island.

However, genetic analysis, conducted by an international group led by Yale University’s Adalgisa Caccone, and including UBC Okanagan associate professor Michael Russello, has clearly identified two separate populations.

The new species, only found on the eastern side of Santa Cruz Island and occupying an area currently estimated at about 40 km2 (one-tenth of the island’s size) has been called the Eastern Santa Cruz Tortoise (Chelonoidis donfaustoi).

“The naming of this new species will increase efforts to protect and restore the Eastern Santa Cruz Tortoise,” says Caccone. “Its low numbers, limited geographic range, and reduced genetic diversity make it vulnerable. As a newly recognized species, it will now receive the attention needed to ensure its survival.”

While the Western Santa Cruz Tortoise has a few thousand individuals, the newly named Eastern Santa Cruz Tortoise numbers in the low hundreds. Its distribution, nesting zones, abundance, and potential threats are not well known.

Over the centuries, giant tortoises were devastated throughout the Galápagos Islands due to human exploitation, introduced species, and habitat degradation. The Giant Tortoise Restoration Initiative, a collaborative project of the Galápagos National Park Directorate, Galápagos Conservancy, and international scientists, is focused on the long-term restoration of all Galápagos tortoise populations to historical numbers. Special emphasis will now be placed on the Eastern Santa Cruz Tortoise.

Research team member Russello, who heads the Ecological and Conservation Genomics Laboratory at UBC’s Okanagan campus, first started working on this project when he was a postdoctoral fellow at Yale University.

“We initially reported cryptic species diversity in the giant Galápagos tortoises of Santa Cruz Island back in 2005,” he says. “The paper that came out this week formally describes the new species on this island, which will have important implications for conservation.”

The discovery also calls attention to a longtime Galápagos National Park ranger, Fausto Llerena Sánchez, who spent decades developing methods still used today for breeding endangered tortoises. Known to his friends and colleagues as Don Fausto, the new species’ Latin name, Chelonoidis donfaustoi, was chosen in his honour.

Park ranger Don Fausto dedicated 43 years (1971-2014) to giant tortoise conservation and was the primary caretaker at the Tortoise Breeding and Rearing Center on Santa Cruz, which now bears his name. The restoration of several tortoise populations is due in part to Don Fausto’s dedication and efforts.

“It has been a privilege to work with this international team that now includes academics and in-country scientists and managers on four continents,” Russello adds. “Most importantly, it has been the continued collaboration of the Galápagos National Park and their commitment to scientifically-informed conservation that has enabled research results to be effectively translated into management strategies.”

Russello says the research team will continue to explore patterns of variation in Galápagos tortoises to investigate basic questions regarding speciation on islands, but also novel ways in which genetic and genomic tools can be used to assess conservation status and inform management strategies.

“This is an exciting moment in the history of Galápagos giant tortoises,” says Linda Cayot, science advisor for Galápagos Conservancy. “Over the last several years, the ever-growing role of genetics in guiding development of conservation strategies for Galápagos tortoises continually requires us to think in new ways.”

Just Posted

Kelowna and Lake Country popular stories from the week

The Capital News and Calendar highlight popular stories every Saturday afternoon

Cook kicks off byelection campaign in West Kelowna

The campaign office will be open seven days a week in the Westbank Shopping Centre

Kelowna students complete D.A.R.E. program

Students at Heritage Christian School received their certificates Friday

Dual-credit film program approved for Central Okanagan students

The Central Okanagan Public Schools is developing a program with the Vancouver Film School

Kelowna youth wellness centre receives $10,000 donation

The Foundry received a cheque from the Rotary Club of Kelowna Sunrise Friday

Disappointing turnout for Kelowna women’s march

The Kelowna Women’s March on Washington was held Saturday, Jan. 20

Rockets take down Royals

Kole Lind has four points and Jack Cowell scores twice as Rockets rebound from 7-2 loss at Seattle

VIDEO: Thousands join women’s march events across B.C.

Today marks one year since the first Women’s March on Washington

Two Canadians, two Americans abducted in Nigeria are freed

Kidnapping for ransom is common in Nigeria, especially on the Kaduna to Abuja highway

Are you ready for some wrestling? WWE’s ‘Raw’ marks 25 years

WWE flagship show is set to mark its 25th anniversary on Monday

B.C. woman who forged husband’s will gets house arrest

Princeton Judge says Odelle Simmons did not benefit from her crime

Liberals’ 2-year infrastructure plan set to take 5: documents

Government says 793 projects totalling $1.8 billion in federal funds have been granted extensions

Workers shouldn’t be used as ‘pawns’ in minimum wage fight: Wynne

Comments from Kathleen Wynne after demonstrators rallied outside Tim Hortons locations across Canada

Women’s movement has come a long way since march on Washington: Activists

Vancouver one of several cities hosting event on anniversary of historic Women’s March on Washington

Most Read