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<\/p>\nWhole genome sequencing has revealed that snow leopards have low genetic diversity because they are rare, and probably always have been.<\/p>\n
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Snow Leopard (Panthera uncia). (Credit: Paul Groom Photography Bristol, Public Domain)<\/p>\n
Paul Groom Photography, Public Domain<\/p>\n
A recently published study finds that snow leopards, Panthera uncia, have the lowest genetic diversity of all the big cats, probably because they have always had a small population throughout their entire evolutionary history. Such low genetic diversity increases their risk of extinction in a rapidly changing environment.<\/p>\n
Snow leopards are the top predator in their high altitude habitat, with some animals capable of hunting and killing prey that is three times their own body weight. Snow leopards commonly prey upon blue sheep, Argali wild sheep, ibex, and deer, as well as marmots, pikas, and other small mammals. Sadly, when their natural prey becomes harder to find, snow leopards sometimes kill livestock to survive, and this, in turn, often leads to retaliatory killings of snow leopards by local farmers or herders.<\/p>\n
Snow leopards are a key indicator of the health of their high-altitude habitat. The loss of these animals would indicate the decline and collapse of their entire alpine ecosystem. These big cats are highly specialized to live in their remote habitat in the arid, mountainous regions of 12 northern and central Asian countries, including Russia, Afghanistan, Nepal, and Tibet (Figure 1). In the Himalaya mountains, snow leopards live in pristine high elevation areas, mostly above the tree line and up to 5500 meters (18,000 feet) in elevation.<\/p>\n
\u201cSnow leopards live in these really untouched areas, unlike other big cat species, which have suffered from human impact already,\u201d said the study\u2019s lead author, conservation geneticist Katie Solari, a research scientist in biology at Stanford University<\/a>. Dr Solari is also the Associate Director of the Program for Conservation Genomics<\/a> (PCG). <\/p>\n Fig. 1. Snow leopard distribution and sample maps. (A) The IUCN snow leopard distribution is the largest snow leopard range countries are labeled. The total potential snow leopard range (all shades of red and pink) is 3,256,841 km2, of which 2,778,309 km2 is considered to be the current range. Within the current range, snow leopards are only definitively present in 32% of the area [889,059 km2, definitive observation of snow leopards within the year leading up to the assessment (2007\u20132008)], probable in 8% (222,265 km2, likely present based on habitat, prey, and connectivity and there is recent nondefinitive information or definitive information of snow leopard presence within the last 5 y), and possible in 60% (1,666,985 km2, possibility present due to habitat and connectivity to known populations, but no specific information about snow leopards in this area within the last 5 y). (B) Sample locations are indicated with different sized circles indicating the number of samples from each location. The basemap indicates elevation and landscape features discussed in the text are labeled. Gray dashed ovals indicate the geographic distribution of the three subspecies suggested by Janecka et al. \u2013 a) P. u. irbis, b) P. u. uncia, c) P. u. uncioides. In both maps, country boundaries available from the Snow Leopard Trust are shown in dark gray. Not all country boundaries are in agreement, so a dotted line is used for India and a dashed line is used for China to make overlapping boundaries visible. Maps were created using ArcGIS software by Environmental Systems Research Institute, Inc.<\/p>\n doi:10.1073\/pnas.2502584122<\/p>\n In their recently published genomics study, Dr Solari and collaborators estimated that these highly specialized big cats have a population size of less than 8,000 individuals (ref<\/a>). (The Snow Leopard Trust<\/a>, an organization devoted to the conservation of these rare big cats, relies on population census data and their estimates suggest there are between 3,920 and 6,390 snow leopards left in the wild.)<\/p>\n Snow leopard numbers are believed to be in decline due to a wide variety of anthropogenic threats, particularly poaching and farming. Additionally, snow leopards are under threat from increasing greenhouse gas emissions, which are expected to cause a shift of the Himalayan treeline and a shrinking of the alpine zone, thereby reducing snow leopard habitat by an estimated 30% (ref<\/a>). Due to their small population size and to the growing effects of climate change, snow leopards are currently listed as \u2018Vulnerable\u2019 by the International Union for Conservation of Nature<\/a> (IUCN).<\/p>\n \u201cThey don\u2019t have many individuals,\u201d Dr Solari told me in email. \u201cThey don\u2019t have much genetic diversity.\u201d This limited genetic diversity reduces the genetic tools these big cats have available to deal with the changing climate.<\/p>\n \u201cSnow leopards are just not well situated to deal with changes that are likely coming their way.\u201d<\/p>\n Dr Solari and collaborators came to this worrying conclusion after they analyzed whole-genome sequencing data extracted from snow leopard samples. Prior to this research, not much was known about snow leopard genetics because only four individuals had ever been fully sequenced. This study brings that number to 41, including 35 wild snow leopards and six individuals from zoos around the world.<\/p>\n Obtaining such a large number of samples required years of work and extensive collaboration with researchers and wildlife officials from 11 countries, all of whom contributed snow leopard blood and tissue samples for this research.<\/p>\n Dr Solari and collaborators did also uncover some good news: despite their low genetic diversity, snow leopards are not like some other big cat species that also have small populations. Cheetahs, for example, had very large populations historically before they experienced two sudden population crashes \u2013 creating a genetic \u201cbottleneck\u201d \u2013 that led to their restricted genetic diversity today. As a result, it is harder for cheetahs to thrive as negative mutations were passed down to fewer and fewer individuals. These negative mutations lowered their reproductive success and increased their susceptibility to disease.<\/p>\n In contrast to cheetahs, Dr Solari and colleagues found that, despite snow leopards\u2019 low genetic diversity, they had a significantly lower \u201chomozygous load\u201d than cheetahs. Thus, snow leopards inherit fewer duplicate copies of potentially harmful genetic mutations from their parents. This suggests that the snow leopards\u2019 persistent small, stable population size allowed these animals to purge such mutations. Basically, if a negative trait surfaced, affected individuals died before reproducing or their progeny were less successful. This genetic purging, facilitated by historic inbreeding, allowed the snow leopard population to remain relatively healthy even with small numbers.<\/p>\n But the situation is changing rapidly.<\/p>\n \u201cBecause their habitat is so inhospitable, human population growth didn\u2019t really affect snow leopards very much, but climate change will,\u201d pointed out the study\u2019s senior author, evolutionary biologist Dmitri Petrov, a Michelle and Kevin Douglas Professor in the School of Humanities and Sciences at Stanford. Professor Petrov\u2019s expertise lies in understanding the process of rapid adaptation to and newly arising mutations in a range of systems and ecological contexts.<\/p>\n \u201cIf their habitat starts degrading, then snow leopards might go extinct fairly easily, simply because there\u2019s just not much ecological space for them and the total population is so small,\u201d Professor Petrov said.<\/p>\n In a second study, also recently published, Dr Solari, Professor Petrov and collaborators report a genetic test they developed for testing snow leopard feces (ref<\/a>). This test utilizes a single nucleotide polymorphism (SNP) panel method that is broadly usable for conservation projects in any country \u2013 cost effective, streamlined lab protocol and user-friendly open-source bioinformatics protocols for panel design and analysis. This SNP panel will provide valuable information to the snow leopard conservation community in their efforts to monitor local and global snow leopard population health and sizes by identifying individual snow leopards, assessing their diets, internal parasite load, microbiome diversity and hormonal milieu, as well as tracking population trends without having to stress them out by physically capturing them. This non-invasive SNP fecal test promises to be valuable to the snow leopards and their human guardians in the face of the changing climate.<\/p>\n \u201cHumans don\u2019t need to show up in their mountains to build or start agriculture. The climate changes, and it affects everyone and everything, even in such remote areas.\u201d<\/p>\n Sources:<\/p>\n Katherine A. Solari, Simon Morgan, Andrey D. Poyarkov, Byron Weckworth, Gustaf Samelius, Koustubh Sharma, Stephane Ostrowski, Uma Ramakrishnan, Zairbek Kubanychbekov, Shannon Kachel, \u00d6rjan Johansson, Purevjav Lkhagvajav, Heather Hemmingmoore, Dmitry Y. Alexandrov, Munkhtsog Bayaraa, Alexey Grachev, Miroslav P. Korablev, Jose A. Hernandez-Blanco, Bariushaa Munkhtsog, Barry Rosenbaum, Viatcheslav V. Rozhnov, Ali Madad Rajabi, Hafizullah Noori, Kulbhushansingh R. Suryawanshi, Ellie E. Armstrong, and Dmitri A. Petrov (2025). Exceedingly low genetic diversity in snow leopards due to persistently small population size<\/strong>, Proceedings of the National Academy of Sciences 122<\/strong>(41):e2502584122 | doi:10.1073\/pnas.2502584122<\/a><\/p>\n Katherine A. Solari, Shakeel Ahmad, Ellie E. Armstrong, Michael G. Campana, Hussain Ali, Shoaib Hameed, Jami Ullah, Barkat Ullah Khan, Muhammad A. Nawaz, and Dmitri A. Petrov (2025). Next-Generation Snow Leopard Population Assessment Tool: Multiplex-PCR SNP Panel for Individual Identification From Faeces<\/strong>, Molecular Ecology Resources 25<\/strong>(4):e14074 | doi:10.1111\/1755-0998.14074<\/a><\/p>\n \u00a9 Copyright by GrrlScientist<\/a> | hosted by Forbes<\/a> | LinkTr.ee<\/a><\/p>\n Socials:<\/strong> Bluesky<\/a> | CounterSocial<\/a> | LinkedIn<\/a> | Mastodon Science<\/a> | Spoutible<\/a> | SubStack<\/a> | Threads<\/a> | Twitter<\/a><\/p>\n