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A species goes extinct when there are none of its kind left. In other words, extinction is about small numbers, so how does big data help us study extinction? Luckily for us, each individual of a species carries with it signatures of its past, information on how connected/ isolated it is today, and other information on what may predict its future, in its genome. The last fifteen years have witnessed a major change in how we can read genomes, and information from genomes of individuals and species can help better plan their conservation. 

All life on Earth harbours genetic material. Often called the blueprint of life, this genetic material could be DNA or RNA. We all know what DNA is, but another way to think of DNA is as data. All mammals, for example harbour between 2 to 3.5 billion bits of data in every one of their cells. The entire string of DNA data is called the whole genome. Recent changes in technology allow us to read whole genomes. We read short 151 letter long information bits many, many times, and piece together the whole genome by comparing it to a known reference. This helps us figure out where each of these 151 letter long pieces go in the 3 billion letter long word. Once we have read each position on an average of 10 or 20 times, we can be confident about it. If each genome is sequenced even ten times and only ten individuals are sampled, for mammals each dataset would consist of 200 to 350 billion bits of data!

Over time, the genome changes because of mutation, or spelling errors that creep in. Such spelling errors create variation, or differences between individual genomes in a population (a set of animals or plants). Similarly, large populations with many individuals will hold a variety of spellings or high genetic variation. Since DNA is the genetic blueprint, changes in the environment can also get reflected in these DNA spellings, with individuals with certain words in their genome surviving better than others under certain conditions. Changes in population size often changes the variety of letters observed at a specific location in the genome, or variation at a specific genomic position. Migration or movement of animals into a population adds new letters and variation. Taking all these together, the history of a population can be understood by comparing the DNA sequences of individuals. The challenge lies in the fact that every population faces all of these effects: changes in population size, environmental selection, migration and mutation, all at once, and it is difficult to separate the effects of different factors. Here, the big data comes to the rescue.

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Photo Credit: Dr Anubhab Khan

Genomic data has allowed us to understand how a population has been affected by changes in climate, and whether it has the necessary genomic variation to survive in the face of ongoing climate change. Or how specific human activities have impacted a population in the past. We can understand more about the origins of a population. How susceptible is a population to certain infections? Or whether the individuals in a population are related to each other. Some of these large datasets have helped identify if certain populations are identical and should be managed together or separately. All of these questions help in the management and conservation of a population.

We have worked on such big genomic datasets for tigers, and our research has helped us identify which populations of tigers have high genomic variation and are more connected to other populations. We have identified populations that are small and have low genomic variation, but also seem to have mis-spelled or badly spelled words, or a propensity of ‘bad’ mutations. We have identified unknown relationships between individuals within populations and have suggested strategies that could allow these isolated populations to recover their genomic variation. It has been amazing to peek into animals lives through these big data approaches, and we hope these types of genomic dataset will contribute to understanding how biodiversity can continue to survive on this Earth.


Uma Ramakrishnan is fascinated by unravelling the mysteries of nature using DNA as tool. Along with her lab colleagues, she has spent the last fifteen years studying endangered species in India.She hopes such understanding will contribute to their conservation. Uma is a professor at the National Centre for Biological Sciences.

Dr. Anubhab Khan is a wildlife genomics expert. He has researching genetics of small isolated populations for past several years and has created and analyzed large scale genome sequencing data of tigers, elephants and small cats among others. He keen about population genetics, wildlife conservation and genome sequencing technologies. He is passionate about ending technology disparity in the world by either making advanced technologies and expertise available or by developing techniques that are affordable and accessible to all.

This series is an initiative by the Nature Conservation Foundation (NCF), under their programme ‘Nature Communications’ to encourage nature content in all Indian languages. To know more about birds and nature, Join The Flock


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Archaeologists May Have Found 2,100-Year-Old Roman Canal Built by Gaius Marius

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Archaeologists May Have Found 2,100-Year-Old Roman Canal Built by Gaius Marius

A Roman canal dated back more than 2,100 years may have been located in southern France. The structure is believed to be the Marius Canal. It is thought to have been built between 104 and 102 B.C. during the Cimbrian Wars. The Romans had been engaged in battles against the Cimbri and Teutones, two migrating Celtic tribes. The waterway was said to have been ordered by Roman general Gaius Marius to improve supply routes. If confirmed, this would be the first major Roman hydraulic engineering project in Gaul.

Study Suggests Ancient Canal Matches Roman Construction Patterns

According to a study published in the Journal of Archaeological Science: Reports, the canal’s remains were found south of Arles within the Rhône River delta. The research team which was led by Joé Juncker, a geoarchaeologist at the University of Strasbourg, conducted sediment core analysis and radiocarbon dating. These tests indicate that the site was used between the first century B.C. and third century A.D. The dimensions of the canal which measured approximately 98 feet in width, aligns with Roman engineering standards.

Archaeological Evidence Points to Roman Use

Finding from the site includes 69 pieces of Roman ceramics. It  has two ancient wooden stakes, and large cobblestone platforms. Radiocarbon analysis of the stakes suggests they date back to the first to fourth century A.D. Simon Loseby, an honorary lecturer at the University of Sheffield, told Live Science that the discovery adds to evidence of Roman large-scale infrastructure projects. He noted that further excavations may reveal quays or towpaths, which could provide stronger confirmation of the canal’s purpose and duration of use.

Further Excavations Needed to Confirm Identity of Canal

The last historical mention of the Marius Canal was recorded by Pliny the Elder in the first century A.D. Juncker cautioned that without additional archaeological verification, definitive attribution to Marius remains uncertain. Research at the site continues.

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James Webb Telescope Captures Neptune’s Auroras in Stunning Detail

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James Webb Telescope Captures Neptune’s Auroras in Stunning Detail

Neptune’s elusive auroras have been captured for the first time in newly released images. It offers an unprecedented look at the ice giant’s atmospheric activity. After decades of conjecture, the occurrence of these auroras has been confirmed by direct visual evidence from the James Webb Space Telescope (JWST). Their presence had been hinted at by earlier observations, such as the Voyager 2 flyby data, but photographing them had proven difficult. The telescope’s near-infrared capabilities, which allowed for the remarkably clear detection of these emissions, have been credited with the breakthrough.

Results of the Research

Reportedly, according to research conducted at Northumbria University and the University of Leicester,Neptune’s auroras are said to be very different from those seen on other planets. Neptune’s auroras can be seen in unexpected places, in contrast to Earth, Jupiter, and Saturn, where auroral activity is usually focused near the poles. This anomaly has been linked to the planet’s highly tilted and offset magnetic field, which directs charged particles from the solar wind in unpredictable ways.

Henrik Melin, a planetary scientist at Northumbria University, stated that seeing the auroras with such precision was unexpected. 

Role of H₃⁺ and Temperature Decline

Data collected using JWST’s Near-Infrared Spectrograph (NIRSpec) provided additional insights into Neptune’s ionosphere, where auroras form. A key discovery was the presence of trihydrogen cation (H₃⁺), an ion commonly associated with auroral emissions on gas giants. JWST scientist Heidi Hammel explained that detecting H₃⁺ was crucial. She said that H3+ has been a clear signifier on all the gas giants—Jupiter, Saturn, and Uranus—of auroral activity and they expected to see the same on Neptune, highlighting that previous ground-based efforts had failed to confirm this.

Temperature measurements taken from the JWST observations also revealed a striking finding—Neptune’s upper atmosphere has cooled significantly since Voyager 2’s 1989 flyby. Melin noted that the recorded temperature in 2023 was just over half of what was observed during the spacecraft’s visit. The decrease in temperature may have contributed to the difficulty in detecting auroras, as cooler conditions result in weaker emissions.

Future Observations and Research

The study has reinforced the need for infrared-sensitive instruments in future missions aimed at studying the outer planets. Leigh Fletcher, a planetary scientist at the University of Leicester, said that JWST’s ability to capture Neptune’s auroras has set a new benchmark. He stated that this observatory has opened the window onto this last, previously hidden ionosphere of the giant planets. Scientists plan to conduct further observations to understand Neptune’s atmospheric and magnetic interactions fully.
 

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Mysterious Light Spiral Over Europe Traced to SpaceX Falcon 9 Reentry

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Mysterious Light Spiral Over Europe Traced to SpaceX Falcon 9 Reentry

A bright, mesmerising light was seen painting the night sky across several parts of Europe on March 24. Witnesses from the United Kingdom including Lincolnshire, Yorkshire, Leicestershire, Suffolk, and Essex along with observers in Wales, Sweden, Croatia, Poland, and Hungary, reported a stunning glowing vortex that lingered in the atmosphere for roughly 12 minutes before slowly dissipating.

Light Spiral Caused by SpaceX Rocket Reentry

According to the reports, the Falcon 9 rocket, which was responsible for this celestial display was launched from Cape Canaveral Space Force Station in Florida at 1:48 p.m. ET. The spacecraft was transporting a classified payload for the National Reconnaissance Office. Following the completion of its mission, the rocket’s second stage began its descent, initiating a spectacular visual phenomenon. As the remaining fuel was released into space, it crystallized into minuscule ice particles. Sunlight then caught these frozen droplets, generating the distinctive swirling pattern. The unique spiral shape emerged from the rocket’s rotational movement during its downward trajectory.

Increasing SpaceX Spiral Sightings

In recent years, the public has been captivated by similar cosmic spectacles. A “horned” spiral appeared in the sky above Europe in May 2024, and an aurora-coinciding launch in April 2023 created a dazzling blue spiral over Alaska. Similar structures were recorded by Hawaii’s Subaru Telescope on Mauna Kea in January 2023 and April 2022.

Although not all Falcon 9 reentry produces such observable spirals, aerospace experts point out that their frequency has grown in tandem with the rising number of rocket launches. By monitoring launch dates and predicted paths, astronomers can usually predict these events. But in this case, because the operation was classified, advance information was kept secret, which gave the night sky a sense of unanticipated amazement.

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