Tag Archives: galapagos

Rediscovery of a Tiny Elusive Gecko in the Galapagos Islands

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Leaf-toed Gecko from Rabida Island

Rory Stansbury/Island Conservation

A small gecko has been rediscovered on Rabida Island in the Galapagos, previously believed to have been eradicated by invasive rats.

The leaf-toed gecko (Phyllodactylus maresi) measures just 8 centimeters in length, with a fossil record indicating its presence on Rabida over 5,000 years ago. However, live specimens were collected during expeditions in 2019 and 2021, confirming its survival as a species.

The gecko’s reappearance is linked to a successful restoration project led by the US-based nonprofit Island Conservation, which commenced in 2011. Collaborating with Galapagos National Park, the Charles Darwin Foundation, and the Raptor Center, the initiative also targets 10 other islands in the Galapagos, employing helicopters for large-scale distribution of poison bait to control invasive species.

By 2012, rats were officially deemed eradicated on Rabida, enabling a rapid ecological recovery, including the return of the gecko species. “We conducted thorough monitoring before the removal of invasive rats and found none,” stated Paula Castaño, an island conservation officer. “Initially, we had a small population, and without invasive predators, we finally had the chance to restore and expand that population, marking one of the most significant comebacks in history.”

Using DNA analysis, Castaño and her team discovered that the Rabida population is closely related to P. maresi from a neighboring island, yet it is classified as a distinct lineage known as evolutionarily significant units, emphasizing the critical need for conservation efforts.

The case of Rabida exemplifies the advantages of island restoration and invasive species removal, says Castaño. “We found a ‘extinct’ gecko alongside the last identified snail species from 1906. Furthermore, two additional snail species, once thought to be lost, were rediscovered on the island. “Nature is remarkable. It allows for rebirth and regeneration.”

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Source: www.newscientist.com

The Endangered Galapagos Turtle Welcomes 100 Hatchlings as First-Time Mother

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Congratulations, mommy, Galapagos turtle, and longtime resident of the Philadelphia Zoo, recently became their first mother at an estimated age of 100.

Mom, People who have lived in the zoo since 1932layed 16 eggs in November. Four of them have been hatched. It was the first successful hatching of her species at the zoo, which opened in 1874.

Of course, she had helped. Abrazo, male turtle, is estimated to be about a century ago.

Mama and Abrazo, members of the West Santa Cruz subspecies, are the oldest animals at the Philadelphia Zoo. But Galapagos turtles can live up to 200 years longer, the zoo said.

The first hatching was released on February 27th, and the zoo announced it on Thursday. The others continued within a few days, with the last one being hatched on March 6th.

Neither of the hatching has been named, but is expected to be in the public eye from April 23rd, the zoo said. According to Lauren Augustine, director of herpetology at the zoo, they do “fantasy.” (Herpetology refers to the study of reptiles and amphibians.)

“They’re the size of tennis balls and they’re actually pretty good,” Augustine said.

The turtles in the West Santa Cruz Galapagos are International Union for Conservation of Nature. According to the Philadelphia Zoo, before the new arrival, there were only 44 giant turtles in West Santa Cruz at every zoo in the United States.

Baby turtles will not share the same physical space as their parents. Their impressive size – Abrazo is 410 pounds, and Mama is about 280 pounds – poses the risk of crushing the hatch ring.

Unlike his peers, Abrazo is not his first parent. In 2011 he was part of a successful pairing; Unexpected discoveries of five hatching His previous home is Riverbanks Zoo and Gardens in Columbia, South Carolina

Abrazo came to the Philadelphia Zoo on the recommendation of the Zoo and Aquarium Association.

Abrazzo and Mommy were introduced in 2022, and Mama began laying eggs in 2023. She has now laid four rounds of eggs. The first three rounds were not feasible. But the fourth was.

Once she laid eggs, members of the zoo staff were set up to weigh, measure, and artificially incubate at two different temperatures.

All four hatch rings born this year are women, but Augustine said three more eggs are still being raised.

“It’s kind of testimony through the excellent care that she has to take at the institution,” said Stephen Diver, a professor of zoology medicine at the University of Georgia. “It’s not easy to keep a huge tropical turtle in the Northern Hemisphere properly.”

Being hatched will be taken prisoner for at least five years. The zoo then decides what to do with them, Consultation with the Zoo and Aquarium Association. If they were genetic matches for other turtles, they could either end up at another zoo or spend their days in the wild in the Galapagos Islands off the coast of Ecuador. But that would take a risk, said Rachel Metz, vice president of animal welfare at the Philadelphia Zoo.

“They are at extreme risk from natural disasters, potentially diseases, climate change and invasive species,” she said.

Centuries ago, the Galapagos turtle population reached hundreds of thousands, but it fell over time as it was hunted for human consumption. However, in half a century, the population recovered. Up to about 17,000 For conservation and breeding programs.

Although estimates of the population of turtles in West Santa Cruz vary widely, Stephen Blake, an assistant professor of biology at St. Louis University who has worked extensively with turtles in the Galapagos, says it is likely to be thousands. The population appears to be growing steadily, he said.

The population is small and prisoner reproduction is very rare, so hatching would give researchers the opportunity to study turtles from young ages in captivity, said Juan Manuel Vazquez, a biologist who studied aging in long-standing living animals. Includes Galapagos turtles.

“Additional turtles count,” he said.

Dr. Blake said it is not uncommon for Galapagos turtles to breed in 100 in the wild. Given that, hatching the Philadelphia Zoo is unlikely to have a major impact on conservation efforts, but it could help raise awareness about the massive turtles in general.

“In my opinion, this is not intended to do much for what is happening in the wild directly, reproducing a turtle. But indirect terms, zoos can promote the wonder of producing 100-year-old reptiles for the first time, and use it as a means to surprise them among people.. ”

Source: www.nytimes.com

At what point in history did the Galapagos giant tortoise grow so big?

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The Galapagos Islands are equatorial islands in the eastern Pacific Ocean, approximately 900 kilometers (500 miles) west of northern South America. Scientists have identified more than 1,500 native species of birds, reptiles, and other animals that live only on these islands, which are known for their biodiversity. One famous example is the Galapagos tortoise. This giant tortoise can weigh up to 400 kilograms (nearly 1,000 pounds), making it the largest cold-blooded land animal.

Scientists have speculated about the evolution of Galapagos tortoises. Charles Darwin visited this island for the first time aboard the HMS. Beagle 1835. Researchers agree These turtles originate from the South American continent, but it is still unknown how they migrated to the island and when they reached their impressive size.

Some scientists believe that Galapagos giant tortoises became large after immigrating to the islands, while others argue that the tortoises grew large before leaving the mainland. Proponents of the “then” hypothesis cite several examples in which island birds and snakes similarly grew larger than continental birds and snakes. Proponents of the “before” hypothesis argue that gigantism may have helped turtles cross oceans. They suggest that larger turtles have slower metabolisms, so they lose less body heat in the water, and have larger, more buoyant shells.

Researchers from the United States and Ecuador recently reconsidered the Galapagos tortoise debate based on new fossils collected off the coast of Ecuador. Paleontologists have previously discovered fossilized large turtles in southern South America, which they claim are ancestors of Galapagos giant tortoises. However, these fossils are located far south of the equatorial islands, and scientists have found no direct evidence that they are related to the Galapagos species. These researchers therefore wanted to test giant tortoise fossils found near the island.

The new turtle fossil was composed of shell material collected from sandstone of the Tablazo Formation on mainland Ecuador. The researchers explained that these fossils were only briefly described by researchers studying mammal fossils in the 1950s, so they may have been missed by earlier scientists. Researchers estimated that the fossil belonged to a turtle that was more than 1 meter (or 3 feet) long, and about the size of a Galapagos giant tortoise. Past researchers Researchers narrowed down the age of the Tabrazo Formation to between 780,000 and 12,000 years, making it the oldest giant tortoise fossil discovered by scientists in northern South America.

The researchers compared the new Ecuadorian giant tortoise fossils with fossils from other South American and Caribbean giant tortoises, as well as with extant Galapagos tortoises. They use features such as shape, structure, size, and age of fossilized and modern turtle shells to create a picture of how these turtles and their potential ancestors are related. Created. Phylogenetic tree. They called these trees: Tip dateThat’s because they placed different types of turtles at the ends, or “tips,” of trees and assigned each species an estimated age, or “dated.”

They used a statistical method called . Bayesian analysis Evaluate the probability that each tree is correct based on known relationships between several species and new data from Ecuadorian fossils. The research team found that Galápagos tortoises are more closely related to Ecuadorian tortoise fossils than any other species included, based on the most likely tree shape, and that the two groups have a common Confirmed that they share a common ancestry.

The researchers interpreted the phylogenetic analysis as supporting previous researchers’ claims that a population of giant tortoises lived on the coast of Ecuador more than 2 million years ago. The researchers explained that this was around the same time and place that scientists believe Galapagos tortoises hitchhiked to the islands on the Humboldt Current, which flows north along the west coast of South America. Therefore, they suggested that their findings support the “previous” hypothesis proposed by some scientists.

Researchers concluded that Galapagos tortoises were gigantic before they left mainland South America. However, researchers cautioned that South America’s fossil record is incomplete and poorly preserved, and dating the evolution of Galapagos tortoises remains difficult. They will collect more giant tortoise fossils from South America, possibly incorporating ancient DNA, to help future scientists further examine when and where the Galapagos giant tortoise species originated. Recommended to describe and analyze.


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Source: sciworthy.com