genetic diversity – Artifex.News https://artifex.news Stay Connected. Stay Informed. Tue, 02 Jun 2026 20:46:00 +0000 en-US hourly 1 https://wordpress.org/?v=7.0 https://artifex.news/wp-content/uploads/2026/05/cropped-cropped-app-logo-32x32.png genetic diversity – Artifex.News https://artifex.news 32 32 Tigress Zeenat gives birth to four cubs in Similipal https://artifex.news/article71052567-ecerand29/ Tue, 02 Jun 2026 20:46:00 +0000 https://artifex.news/article71052567-ecerand29/ Read More “Tigress Zeenat gives birth to four cubs in Similipal” »

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Zeenat with one of her cubs in Odisha’s Similipal Tiger Reserve.

The translocation effort aimed at enhancing the genetic diversity of tigers in Odisha’s Similipal Tiger Reserve has received a major boost, with tigress Zeenat, brought from Maharashtra, giving birth to four cubs. Photographs of Zeenat gently carrying her cubs in her mouth within the reserve have since gone viral.

“Today, a proud chapter has been added to Odisha’s natural resources and wildlife conservation efforts. Tigress Zeenat, relocated from Maharashtra’s Tadoba-Andhari Tiger Reserve, has given birth to four cubs in the conducive environment of Similipal,” Chief Minister Mohan Majhi announced on X on Tuesday (June 2, 2026).

“This success not only signifies an increase in the tiger population in the State but also stands as an excellent testament to our administrative foresight in protecting biodiversity and creating a safe and robust habitat for wildlife,” said Mr. Majhi.

Odisha Chief Minister further said, “Special measures have been taken by the Forest Department to ensure the safety of the mother and cubs, and their movements are being continuously monitored. Thanks to the dedicated vigil and effective conservation policies of our forest staff, Odisha has today established itself as a secure sanctuary for wildlife.”

“Our government remains fully committed to preserving the ecological balance of Similipal intact and strengthening the State’s wildlife conservation initiatives in the days ahead,” he asserted.

After her translocation from Maharashtra in 2025, Zeenat had a troubled phase last year. Following 10 days of acclimatisation in the core area of Similipal, the tigress, while attempting to establish her territory, strayed into Jharkhand and then West Bengal in the first week of December, putting the forest departments of Odisha, Jharkhand and West Bengal on alert.

The tigress was tranquilised and captured in West Bengal on December 29, 2025. After a medical examination, the tigress was brought back to Similipal on the directions of the National Tiger Conservation Authority. Subsequently, a special enclosure was created in southern Similipal, while forest department officials kept a strict vigil on Zeenat.

A sizeable number of tigers in Similipal displays pseudo-melanism, characterised by black stripes much more pronounced than the typical colouration of a Royal Bengal Tiger. It is largely due to the result of inbreeding. Under NTCA supervision, Zeenat and another tiger, Jamuna, were released into the Similipal to improve genetic diversity.

According to the Similipal Tiger Reserve authorities, Zeenat was released into a soft enclosure created for Jamuna in the southern division. The southern part covers a major portion of Simlipal’s core area and has denser forest cover and no anthropogenic pressure. The tigress would remain under observation, and in the process, she would continue acclimatising before being released into the wild, the authorities said.

The Odisha government had earlier planned to bring six pairs of tigers from other States to Similipal. Zeenat giving birth to four cubs assumes significant importance for the State Forest department, especially after an earlier experiment to introduce tigers in Satkosia Tiger Reserve had failed. A tiger brought from Madhya Pradesh and released into Satkosia died after falling into a poacher’s trap, while another was sent back to Madhya Pradesh after facing hostility from people within Satkosia Reserve Forest.



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Silk Road trading helped produce the modern horse https://artifex.news/article60426831-ece/ Fri, 22 May 2026 11:36:00 +0000 https://artifex.news/article60426831-ece/ Read More “Silk Road trading helped produce the modern horse” »

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By >William Feeney 

The Silk Road snaked across continents for more than a thousand years, shaping civilisations in East and West. Famously trodden by Alexander the Great and Genghis Khan, the trade route brought riches to Europe and plagues to Asia. But it is not just humans who hold its legacy. For new research shows that the genes of the modern horse were forged along the way.

In a paper published in the journal > Molecular Ecology , Cambridge University zoologist Vera Warmuth and her colleagues investigate factors that affected the genes of modern horses in Eurasia. They wanted to know what explains the genetic structure of modern horses. Was it geographic factors such as the Caspian and Black seas, Himalayan Mountains or massive geographic distances, which are known to shape the genetic structure of other animal populations? Or was it human trade routes? 

Warmuth used genetic samples from 455 horses from 17 remote locations spanning Mongolia and China in the East, through to Ukraine and Lithuania in the West. A minimum of 15 samples from each location was taken to calculate genetic diversity of each location and overcome other sampling biases.

The genetic diversity of the horses was calculated in each of the 17 populations – to test how similar or different are these horses and populations from one another. Other factors were considered to explain the genetic structure of the chosen horse populations.

Warmuth found that when geographic distance was taken into account in the analyses, the Silk Road network was an important predictor of gene flow between populations of horses. Ancient human trade facilitated population mixing in horses as far as 8000km apart. Travelling along more arduous Silk Road routes, for instance across the Himalayas and the Tibetan Plateau, was probably more “costly” because less evidence of gene flow was seen in these areas.

Grassland and arid desert routes equally explained genetic variation between populations. Because grassland routes would probably be easier to travel than desert routes, Warmuth concludes that horses were in demand and extensively traded in desert areas.

Finally, Warmuth found that horses from within the former Soviet Union countries are no more similar to one another than horses from outside this area. In other words this study suggests that these horses are likely a product of ancient and long-term trading along the Silk Road routes rather than a product of recent trading practices. This is perhaps not too surprising, given the long generation spans of horses (approximately eight years). Alternatively, this may imply that the trade bloc of the former Soviet Union was not as effective as many have suggested, at least when it comes to horses.

These results help us understand how ancient human movement patterns have shaped the modern horse of Eurasia, as well as giving insight into the difficulties endured by those that traded along the more arduous areas of these paths.

William Feeney receives funding from the Australian National University and Australian Geographic. He is affiliated with the Australian National University. 

This article was originally published at >The Conversation . Read the >original article



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Scientists are using ancient DNA to reveal the Iberian lynx’s ‘weapon’ against extinction https://artifex.news/article68685135-ece/ Thu, 26 Sep 2024 10:16:49 +0000 https://artifex.news/article68685135-ece/ Read More “Scientists are using ancient DNA to reveal the Iberian lynx’s ‘weapon’ against extinction” »

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Many large mammals have lost genetic diversity, often thanks to the actions of people shrinking their populations. The implications can be severe because without genetic diversity, a population does not have a “genetic database” to fall back on to adapt to environmental change.

The Iberian lynx (Lynx pardinus) is no stranger to this reduction in diversity. Human activity has driven populations to dangerously low numbers, leaving them with a shrinking genetic pool. This loss threatens the lynx’s ability to adapt to changing environments, putting their survival at risk.

Our team’s research reveals how the Iberian lynx interbred with its cousin, the Eurasian lynx (Lynx lynx) over the past few thousand years. This mingling may have boosted the Iberian lynx’s genetic diversity. This is a crucial factor for its survival, especially as the species faces such an uncertain future.

Low genetic diversity can lead to “inbreeding depression”, where closely related animals breed and produce offspring that are less fit for survival. In extreme cases, this can push entire populations, or even species, to the brink of extinction.

To boost the genetic diversity of populations on the brink, conservationists sometimes turn to “genetic rescue”. This involves introducing individuals from different populations in the hope that they will breed with the local animals, reducing inbreeding and enhancing genetic diversity.

While this strategy can be effective, it’s not without risks. Introducing animals that are too genetically different can disrupt or dilute beneficial traits, potentially harming the population’s ability to survive and reproduce. It’s a phenomenon known as “outbreeding depression”. Despite these risks, genetic rescue remains a valuable tool in conservation, though it’s often approached with caution.

One of the most severe cases of reduced genetic diversity is the Iberian lynx, once the world’s most threatened cat species. It’s mostly found in parts of Spain and Portugal.

Rescue and recovery

Today, the Iberian lynx is recovering from near extinction. More than 400 reproductive females were reported in the 2023 census. This is a massive increase from just 25 in 2002. This turnaround is largely thanks to an ambitious conservation programme over the past two decades, involving coordinated breeding programmes and reintroductions.

Part of this success is due to the “genetic rescue” effect, where mixing the two remaining genetically distinct populations helped boost the species’ genetic diversity. Despite this progress, the Iberian lynx still faces significant challenges. The population is far from reaching the minimum of 1,100 reproductive females needed to be considered genetically viable. So, its genetic diversity remains one of the lowest ever recorded.

Further genetic rescue could be a solution to enhance diversity. But there’s a catch – no other Iberian lynx populations exist in the world that could serve as a source of new genetic material.

Ancient DNA can be extracted from historical remains or subfossil (animals that are not ancient enough to be considered true fossils but are not considered modern either) samples. By studying these, scientists can gain valuable insights into the genetic past of species, offering a stark comparison with their present day counterparts.

In 2015, our colleague Maria Lucena-Perez first visited the lab of another of our colleagues, Michael Hofreiter, in Germany to generate the very first whole genome data from ancient Iberian lynx bones. Extracting ancient DNA from bones is a highly specialised process that requires dedicated cleanroom facilities to prevent contamination from modern DNA.

Working together, our team successfully extracted nuclear DNA from three ancient Iberian lynx specimens. Two of these were approximately 2,500 years old. The third dated back more than 4,000 years. This marked the first time nuclear DNA had ever been retrieved from ancient Iberian lynx. Maria’s achievement has significantly advanced our understanding of how the genetic makeup of the Iberian lynx has evolved over thousands of years.

Our team analysed and compared the DNA with that of modern Iberian lynx. To our surprise, the ancient lynx showed even lower genetic diversity than their modern descendants. Given the sharp decline in their populations over the past few centuries, this finding was both unexpected and puzzling.

Species interbreeding

The missing piece of the puzzle came with the discovery that modern Iberian lynx populations share more genetic variants with the closely related Eurasian lynx than their ancient counterparts did. This suggests that the two species successfully interbred within the past 2,500 years, boosting the genetic diversity of today’s Iberian lynx.

These findings align with extensive genomic evidence of ancient gene flow from Eurasian lynx into the Iberian lynx genome. While the two species don’t share the same habitats today, they once coexisted in the Iberian Peninsula, and possibly in southern France and northern Italy. This situation would have provided plenty of opportunities for interbreeding.

The potential for these two species to naturally meet and breed is growing once more as their ranges continue to expand. This could open up new possibilities for genetic diversity in the future.

The advent of whole nuclear genome analysis over the past 30 years has revealed numerous cases of cross-species interbreeding, such as between polar bears and brown bears. This suggests that the case of the lynx is not so unusual. But the Iberian lynx stands out as the first documented example where interspecies breeding significantly increased species-wide genetic diversity.

We still don’t fully understand the exact effect of this genetic boost, particularly whether it improved the population’s fitness and survival. One intriguing possibility is that the Iberian lynx has managed to persist despite its extremely low genetic diversity, thanks to recurrent genetic rescues by the Eurasian lynx.

While there’s more to learn, our research offers an unexpected but important case study for the broader discussion on genetic rescue. If we can better predict the chances of inbreeding and outbreeding depression when interbreeding happens, we could use genetic rescue more effectively as a conservation tool in the ongoing biodiversity crisis.

This article is republished from The Conversation under a Creative Commons license. Read the original article.



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