Endangered axolotl release raises hopes for rare amphibian
One of the world's most endangered amphibians - the strange, perpetually smiling Mexican axolotl - has thrived after being released in artificial wetlands, scientists have discovered.
In a study that provides hope for the long-term future of a creature that was pushed to the brink of extinction, scientists released 18 captive-bred axolotls in restored and artificial wetland close to Mexico City.
The researchers fitted the animals with radio trackers and found that they "survived and foraged successfully at both sites" - even gaining weight.
Lead researcher Dr Alejandra Ramos from the Autonomous University of Baja California said this was an "amazing result".
The findings are published in the journal PLoS One and they suggest, the researchers say, that the axoltol can be brought back to its native habitat.
The waters of Xochimilco - shaped by traditional farming practices and flushed with spring water from the mountains - used to teem with these amphibians.
But as Mexico City grew, urbanisation, pollution and other pressures pushed axolotls to the brink of extinction, with some estimates suggesting that there were as few as 50 left in the wild.
"If we lose this species, we lose part of our Mexican identity," said co-lead researcher Dr Luis Zambrano from the National University of Mexico.
It is no exaggeration to call the axoltol an icon. Aztec legend has it that the creature is a god in salamander form - the Aztec god of fire and lightning, Xolotl, disguised as a salamander.
"If we can restore this [wetland] habitat and restore the axolotl's population in a city of more than 20 million people," Dr Zambrano continued, "I feel that we have hope for humanity."
To lay the foundations for releasing the animals, the researchers worked with local farmers and a team of volunteers to create wetland "refuges" for the axolotls. They installed natural filtering systems to clean the water,
The scientists released their captive-bred animals at two sites - one in Xochimilco and one at a disused quarry that, over decades, has turned into what they called an "artificial wetland".
Every animal was tagged with a radio tracking device.
"The amazing news is that they all survived," Dr Ramos told BBC News. "And not only that, but the ones that we recaptured had gained weight - so they're hunting."
The monitoring also revealed intriguing insights into axolotl behaviour. "We found that some spend most of their time with with one other individual - like they make these little friendships," Dr Ramos explained.
Somewhat ironically, these charismatic salamanders are found in the world's laboratories and pet aquariums in their hundreds of thousands. The species is biologically fascinating - it has the remarkable ability to regrow any part of its body that is damaged or lost. So there is research underway to understand whether that ability could be harnessed medically.
But in the murky wetlands of Mexico City, there is still a great deal of work to do to clean up and restore the habitat, and to give the wild axolotl a chance to recover.
"Many animals are losing their habitat around the world," said Dr Ramos. "And restoration projects are not easy, but they can be done - they just need a lot of people.
"You don't need to be a scientist to get involved - everybody in the world can help out."
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AI analysis says Dead Sea Scrolls are older than thought
June 7 (UPI) -- The ancient Dead Sea Scrolls likely are much older than originally thought, a new artificial intelligence analysis suggests. The scrolls could be centuries older than initially thought, according to a study that combined radiocarbon dating with AI to better analyze the remnants of ancient documents, The Times of Israel reported. "The Dead Sea Scrolls ... completely changed the way we think about ancient Judaism and early Christianity," said Mladen Popovic, lead author of the study that was published Wednesday in the journal PLOS One. "Out of 1,000 manuscripts, a bit more than 200 are what we call biblical Old Testament," Popovic told CNN. "They are the oldest copies we have of the Hebrew Bible." Popovic is the dean of the Faculty of Religion, Culture and Society at the University of Groningen in the Netherlands. Archaeologists recovered thousands of remnants of scrolls that were first discovered in 1947 in the Judean Desert by Bedouin shepherds in an area that has become the West Bank. Instead of dating the scrolls based on the form of their lettering, researchers used carbon dating to analyze samples from 30 of the Dead Sea Scrolls that were provided by the Israel Antiquities Authority. They also created high-resolution copies of the scripts and used an AI-powered model called "Enoch" to analyze the textual characters contained in 135 scrolls. The study revealed the scrolls are older than initially thought, which is from the 3rd century B.C. to the 1st century A.D. A paleographic study of the text within the scrolls narrowed their origin to that timeframe in 1961, but little else was done to analyze their origin until now. The new study pretreated pieces of parchment to remove any chemical traces from prior studies before undertaking carbon dating, and AI analysis corroborates the results. It suggests some of the scrolls were one or two centuries older than originally thought, including Old Testament books like Ecclesiastes. The study also suggests literacy was much more widespread in the region. "These manuscripts are not just the earliest copy of these [Old Testament] books that survived," IAA Dead Sea Scrolls Unit leader Joe Uziel told The Times of Israel. They are "one of the oldest copies of these compositions ever written," he said. Only about 10% of the scrolls were studied, which Popovic said means there is a lot more to learn through more studies of the Dead Sea Scrolls.
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Some Dead Sea Scrolls may be even older than archaeologists thought, new study finds
Sign up for CNN's Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Many of the Dead Sea Scrolls, some of the most widely known archaeological finds of all time, may be older than once thought, according to a new study. The fresh analysis, which paired radiocarbon dating with artificial intelligence, determined some of the biblical manuscripts date to about 2,300 years ago, when their presumed authors lived, said Mladen Popović, lead author of the report published Wednesday in the journal PLOS One. Bedouin shepherds first spotted the scrolls by chance in the Judaean Desert, near the Dead Sea, in 1947. Archaeologists then recovered thousands of fragments belonging to hundreds of manuscripts from 11 caves, all near the site of Khirbat Qumran in what is now the West Bank. 'The Dead Sea Scrolls were extremely important when they were discovered, because they completely changed the way we think about ancient Judaism and early Christianity,' said Popović, who is also dean of the Faculty of Religion, Culture and Society at the University of Groningen in the Netherlands. 'Out of around 1,000 manuscripts, a bit more than 200 are what we call biblical Old Testament, and they are the oldest copies we have of the Hebrew Bible. They gave us a lot of information about what the text looked like back then.' The scrolls are like a time machine, according to Popović, because they let scholars see what people were reading, writing and thinking at the time. 'They are physical, tangible evidence of a period of history that is crucial — whether you're Christian, Jewish or don't believe at all, because the Bible is one of the most influential books in the history of the world, so the scrolls allow us to study it as a form of cultural evolution,' he said. Almost none of the Dead Sea Scrolls — which were written mostly in Hebrew on parchment and papyrus — have dates on them. Based primarily on paleography, the study and deciphering of ancient writing and manuscripts, scholars have believed the manuscripts range from the third century BC to the second century AD. 'But now, with our project, we have to date some manuscripts already to the end of the fourth century BCE,' he said, meaning that the earliest scrolls could be up to 100 years older than previously thought. 'That's really exciting because it opens up new possibilities to think about how these texts were written and how they moved to other users and readers — outside of their original authors and their social circles,' Popović added. The findings will not only inspire further studies and affect historical reconstructions, according to the authors of the report, but will also unlock new prospects in the analysis of historical manuscripts. Earlier estimates of the manuscripts' age came from radiocarbon dating conducted in the 1990s. Chemist Willard Libby developed this method — used to ascertain the age of organic materials — in the late 1940s at the University of Chicago. Also known as carbon 14 dating, a chemical analysis of a sample, such as a fossil or manuscript, determines the quantity of carbon 14 atoms it contains. All living organisms absorb this element, but it starts to decay as soon as death occurs, so looking at how much is left can give a fairly accurate age of an organic specimen as old as about 60,000 years. Carbon dating has downsides, however. The analyzed sample is destroyed during the process, and some results can be misleading. 'The problem with earlier tests (on the scrolls) is that they didn't address the issue of castor oil,' Popović said. 'Castor oil is a modern invention, and it was used in the 1950s by the original scholars to make the text more legible. But it's a modern contaminant, and it skews the radiocarbon result to a much more modern date.' The study team first used new radiocarbon dating, applying more modern techniques, on 30 manuscripts, which revealed that most of them were older than previously thought. Only two were younger. The researchers then used high-resolution images of these newly dated documents to train an AI they developed, called Enoch after the Biblical figure who was the father of Methuselah. The scientists presented Enoch with more documents they had carbon-dated, but withheld the dating information, and the AI correctly guessed the age 85% of the time, according to Popović. 'In a number of cases, the AI even gave a narrower date range for the manuscripts than the carbon 14 did,' he said. Next, Popović and his colleagues fed Enoch more images from 135 different Dead Sea Scrolls that were not carbon-dated and asked the AI to estimate their age. The scientists rated the results as 'realistic' or 'unrealistic,' based on their own paleographic experience, and found that Enoch had given realistic results on 79% of the samples. Some of the manuscripts in the study were found to be 50 to 100 years older than formerly thought, Popović said. One sample from a scroll known to contain verse from the Book of Daniel was once believed to date to the second century BC. 'That was a generation after the original author,' Popović said, 'and now with the carbon 14, we securely move it (further back) to the time of the author.' Another manuscript, with verses from the Book of Ecclesiastes, also dates older, Popović added. 'The manuscript was previously dated on paleographic grounds to 175 to 125 BCE, but now Enoch suggests 300 to 240 BCE,' he said. Eventually, artificial intelligence could supplant carbon 14 as a method of dating manuscripts, Popović suggested. 'Carbon 14 is destructive,' he said, 'because you need to cut off a little piece of the Dead Sea Scroll, and then it's gone. It's only 7 milligrams, but it's still stuff that you lose. With Enoch, you don't have to do any of this. This a first step. There are all sorts of possibilities to improve Enoch further.' If the team pushes forward with Enoch's development, Popović believes it could be used to assess scripts such as Syriac, Arabic, Greek and Latin. Scholars who were not involved with the study were encouraged by the findings. Having both AI and an enhanced carbon 14 dating method allows a level of calibration across both methodologies that is helpful, according to Charlotte Hempel, a professor of Hebrew Bible and Second Temple Judaism at the University of Birmingham in the United Kingdom. 'The pronounced pattern seems to be that AI offers a narrower window within the Carbon 14 window,' she said via email. 'I wonder whether this suggests a higher level of precision, which would be extremely exciting.' The study represents a first attempt to harness AI technology to extend existing scientific knowledge from carbon 14 dating of certain manuscripts to other manuscripts, said Lawrence H. Schiffman, Global Distinguished Professor of Hebrew and Judaic Studies at New York University. 'To some extent, it is not yet clear whether or not the new method will provide us with reliable information on texts that have not yet been Carbon-14 dated,' he added via email. 'The interesting comments regarding revision of the dating of some manuscripts that may be expected through further development of this approach or new carbon-14 dating, while not new to this study, constitute a very important observation about the field of Dead Sea Scrolls in general.' Commenting on the computational aspects of the study, Brent Seales, the Alumni Professor of Computer Science at the University of Kentucky, said the approach taken by the authors seems rigorous even if the sample sizes are small. Using AI to completely replace carbon dating may be premature, however. '(AI) is a useful tool to incorporate into the broader picture, and to make estimates in the absence of Carbon-14 based on the witness of other similar fragments,' Seales wrote in an email. 'Like everything with machine learning, and like a fine wine, it should get better over time and with more samples. The dating of ancient manuscripts is an extremely difficult problem, with sparse data and heavy constraints on access and expertise. Bravo to the team for this data-driven contribution that takes a massive step forward.'
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Many Dead Sea Scrolls may be older than experts thought, AI analysis suggests
When you buy through links on our articles, Future and its syndication partners may earn a commission. Many of the Dead Sea Scrolls may be older than experts thought, according to an artificial intelligence (AI) analysis. Consisting of about 1,000 ancient manuscripts etched onto animal skin, papyrus and copper, the Dead Sea Scrolls contain the earliest known versions of texts from the Hebrew Bible — including copies of the books of Genesis, Exodus, Isaiah, Kings and Deuteronomy — and date from the third century B.C. to the first century A.D. Now, scientists have used an AI program, dubbed Enoch, to analyze the handwriting patterns on the scrolls, revealing that they may be older than experts thought. The study authors say their findings, published June 4 in the journal PLOS One, are a significant step in dating some of the earliest versions of the Bible. However, not all experts are convinced. "With the Enoch tool we have opened a new door into the ancient world, like a time machine, that allows us to study the hands that wrote the Bible," lead study author Mladen Popović, director of the Qumran Institute at the University of Groningen in the Netherlands, said in a statement. "Especially now that we have established, for the first time, that two biblical scroll fragments come from the time of their presumed authors." Discovered by Bedouin shepherds inside the West Bank's caves of Qumran from 1946 to 1947, the ancient manuscripts range from legal documents and calendars to sections of the Hebrew Bible and psalms, written mostly in Hebrew but also in Aramaic and Greek. Previous dating of the scrolls relied on paleography — the study of ancient writing systems — with some undergoing radiocarbon dating in the 1990s. However, castor oil had been applied to some of the manuscripts in modern times to improve their legibility. This oil is also a contaminant that can disrupt radiocarbon dating, so the results from these techniques remain a topic of debate. Related: Ancient 'curse tablet' may show earliest Hebrew name of God In an attempt to clear things up, the researchers first cleaned 30 samples from different manuscripts to remove the castor oil, before successfully radiocarbon-dating 27 of them. They found that two of these scroll fragments were younger than past analyses suggested but that other fragments were older. Then, the scientists set about creating their Enoch AI model. Enoch was trained on the handwriting of 24 of the newly dated manuscripts and their radiocarbon dates. After verifying the model with 13 further selected images from the same manuscripts, the researchers presented it with 135 undated manuscripts. They found that it agreed with the estimates made by scholars 79% of the time. Yet the results for the remaining 21% of the scrolls point to a mystery, with Enoch giving them a range of dates that could make them older, hard to determine, or even a century younger than initial estimates. They also suggest that two different writing styles, known as the Hasmonean and Herodian scripts (named after the Jewish Hasmonean dynasty and Herod, the Roman client king, respectively), could have overlapped for longer than previously thought. Nonetheless, Enoch also corroborates earlier paleography, notably for a scroll titled 4Q114, which contains three chapters from the Book of Daniel. Analysts initially estimated 4Q114's writing to have been inked during the height of the Maccabee uprising in 165 B.C. (a part of the Hanukkah story) due to its description of Antiochus IV's desecration of the Second Temple in Jerusalem. The AI model's estimate also falls within this range, between 230 B.C. and 160 B.C. But for some paleographers, the results are hardly surprising. RELATED STORIES —2,700-year-old archaeological site in Jordan may be a biblical place visited by King David —20 of the most bizarre stories from the Bible —Ancient Yahweh worshipper's jar bears Hebrew script in biblical city "The results of this study are very interesting, and presumably important, but not Earth-shattering," Christopher Rollston,a professor and chair of biblical and Near Eastern languages and civilizations at The George Washington University, told Live Science in an email. "Most of the conclusions of this article also dovetail with what the great palaeographers in the field, such as the late Frank Moore Cross, had already stated more than 60 years ago." Rollston also criticized the notion that the new tool could enable researchers to "study the hands that wrote the Bible" as "at the very least, gross hyperbole." No manuscripts of the Hebrew Bible date to the First Temple period (circa 1200 to 586 B.C.), when it was originally composed, or to the early parts of the Second Temple period (538 B.C. to A.D. 70), he said. He noted that AI can be useful, but it should only be one of many techniques used to study ancient texts like the Dead Sea Scrolls. "Enoch could and should never be the only tool in the toolbox of someone wishing to determine the date for the writing of a manuscript. After all, human handwriting, and all of its variations and idiosyncratic features, is a deeply human thing," Rollston added. "Machines can be helpful in isolating features of a script, but the presence of a gifted palaeographer is at least as valuable as a machine-learning tool."
