{"id":1953,"date":"2022-01-26T11:58:00","date_gmt":"2022-01-26T11:58:00","guid":{"rendered":"https:\/\/horizon.peachpuff-wolverine-566518.hostingersite.com\/?p=1953"},"modified":"2022-01-26T11:58:00","modified_gmt":"2022-01-26T11:58:00","slug":"quest-to-uncover-the-origins-of-horse-taming-is-rewriting-our-picture-of-the-past","status":"publish","type":"post","link":"https:\/\/scienceblog.com\/horizon\/1953\/quest-to-uncover-the-origins-of-horse-taming-is-rewriting-our-picture-of-the-past\/","title":{"rendered":"Quest to uncover the origins of horse taming is rewriting our picture of the past"},"content":{"rendered":"<p><strong>Horses have been intrinsically entwined with human history for the past five millennia, acting as an early means of rapid transport and playing a key part in agriculture, warfare and sport.<\/strong><\/p>\n<p>Despite this, major decades-long mysteries have surrounded where and how modern horses were first domesticated. Yet a large international team of zooarchaeologists, historians and geneticists, all experts in horse evolutionary history, has recently started coming up with some answers. The results are showing just how much this can reveal about both the horse itself and about human history and culture \u2013 and how much we still have to find out.<\/p>\n<p>\u2018Horses are perhaps the animals that have had the most influence on human history,\u2019 said palaeogeneticist Ludovic Orlando, director of the Centre for Anthropobiology and Genomics of Toulouse, and a research director at the French National Centre for Scientific Research. \u2018They gave us speed and the way to transport things at a pace that we couldn\u2019t reach with our own legs.\u2019<\/p>\n<p>He talks of just how much they have been involved in human culture, helping, for instance, to drive the initial development of cities by aiding transport \u2013 something that can be forgotten in today\u2019s mechanised world.<\/p>\n<p>And horses have left their mark on our everyday transport and industry of today, he added. \u2018If you think about what we call horsepower for cars, it doesn\u2019t come out of the blue; it\u2019s because it was a metric for measuring how fast a vehicle would be with respect to the horse,\u2019 he said.<\/p>\n<p><strong>Evolving story<\/strong><\/p>\n<p>Given their importance throughout history, a project that Professor Orlando leads called\u00a0<a href=\"https:\/\/cordis.europa.eu\/project\/id\/681605\">PEGASUS<\/a>\u00a0has been seeking to elucidate many aspects of how and where modern horses were domesticated. This has thrown up all kinds of new findings and overturned some key previous hypotheses about the process and related inferences about the movement of people and cultures, aided by the latest genetic techniques.<\/p>\n<p>\u2018It struck us that any time we thought we understood something, we demonstrated that we didn\u2019t,\u2019 said Prof. Orlando. \u2018So we actually revisited every question we asked.\u2019<\/p>\n<p>One major finding that turned earlier evidence on its head came in a\u00a0<a href=\"\/\/\/Users\/Daniela\/Documents\/Horizon\/study%20that%20revisited%20a%20hypothesis%20about%20the%20ancestry%20of%20modern%20horses\">study that revisited a hypothesis about the ancestry of modern horses<\/a>. Previous thinking was that all of today\u2019s domesticated horses descended from those thought to have been tamed by the Botai people 5,500 years ago in the north of present-day Kazakhstan, the oldest-recognised domestic horse population.<\/p>\n<p>But Prof. Orlando and his team found something different when they analysed the DNA from ancient bones, sequencing the genomes of 20 horses from Botai and 22 from across Eurasia over the past 5,000-odd years, and comparing them with 46 published ancient and modern horse genomes.<\/p>\n<p>They discovered that the Botai horses were, in fact, the ancestors of Przewalski\u2019s horses, an endangered population of\u00a0<a href=\"https:\/\/www.iucn.org\/news\/commission-ecosystem-management\/201803\/extinction-free-ranging-successful-reintroduction\">more than 500 wild horses<\/a>\u00a0living today in Mongolia \u2013 where they have been reintroduced in the last three decades after going extinct outside captivity. Indeed, today\u2019s domestic horses were found to share less than 3% of their ancestry with the Botai horses.<\/p>\n<p>Furthermore, this finding implied that horses had been domesticated more than once and, at the same time, flew in the face of the previous belief that Przewalski\u2019s horses were the last truly wild horses in the world \u2013 instead being the remaining feral descendants of Botai horses.<\/p>\n<p>\u2018That was really mind-blowing,\u2019 said Prof. Orlando. \u2018The ones that we thought were the ancestors of all the domesticates were in fact the ancestors of the only wild ones.\u2019<\/p>\n<p><strong>Fresh search<\/strong><\/p>\n<p>Though there has\u00a0<a href=\"https:\/\/www.nature.com\/articles\/s41598-021-86832-9\">some dispute<\/a>\u00a0more recently\u00a0<a href=\"https:\/\/ore.exeter.ac.uk\/repository\/handle\/10871\/126599\">over the domestication of the Botai horses<\/a>\u00a0in the first place, this meant that current domestic breeds must have come from somewhere else. \u2018It left it open to uncover the real source of the domestication process that gave rise to the horses that we know of today,\u2019 said Prof. Orlando.<\/p>\n<p>Looking to get to the bottom of this, he and a huge team of 161 other researchers from across fields including archaeology, palaeogenetics and linguistics, spread the net much wider.<\/p>\n<p>They studied 273 genomes of ancient horses from across Eurasia spanning as far back as 50,000 BCE, along with 10 modern genomes, to map their spread over time \u2013 with radiocarbon dating used to deduce the age of bone samples. This proved enough to lead to the breakthrough the researchers were seeking, revealing their results last October in a\u00a0<a href=\"https:\/\/www.nature.com\/articles\/s41586-021-04018-9\">study published in Nature<\/a>.<\/p>\n<p>They found that today\u2019s domesticated horses originated in around 2,200 BCE from the Western Eurasian steppes, in an area near the Don and Volga rivers in modern-day Russia.<\/p>\n<p>Their predominance then expanded rapidly, replacing all the wild horse populations from the Atlantic in the west to Mongolia in the east over the next few hundred years.<\/p>\n<p>\u2018It was pretty much an overnight process,\u2019 said Prof. Orlando. \u2018It started from one region and spread like fire across the world.\u2019<\/p>\n<p>Potentially helping explain their success ahead of other populations were adaptations that the researchers found in two genes \u2013 GSDMC and ZFPM1 \u2013 that are respectively associated with back pain, and behaviour and aggression. Modifications to these may therefore have made horses tamer and provided them with a stronger back that facilitated them being ridden.<\/p>\n<p>\u2018Maybe this horse type was the lucky one to recombine the right mutations in a way that made them more tameable, as well as keener on transporting stuff,\u2019 said Prof. Orlando.<\/p>\n<p><strong>History and culture<\/strong><\/p>\n<p>The findings also help shed light on the spread of people, showing how insight into horse history can impact on the picture of human migrations and the development of cultures.<\/p>\n<p>Previously, for example, horseback riding was assumed to be linked to the expansion into Europe of steppe pastoralists from a culture known as the Yamnaya around 3,000 BCE, aiding the proliferation of Indo-European languages. However, given that this happened prior to the time of horse domestication \u2013 as suggested by the study \u2013 it indicates that the two were not connected. \u2018That was, again, another discovery that we didn\u2019t expect,\u2019 said Prof. Orlando.<\/p>\n<p>Conversely, the timing of the spread of horse domestication coincided with the expansion of equestrian equipment such as chariots and horse bits across Asia, and the dissemination of Indo-Iranian languages there. \u2018This speaks of the importance of the horse in driving us across the world,\u2019 said Prof. Orlando.<\/p>\n<p>Other research during the PEGASUS project has produced further findings about the relationship between people and their horses, shedding light on adaptive mutations associated with selective breeding for domestication.<\/p>\n<p>They found, for instance, that nomadic Scythian herders inhabiting the Central Asian steppes in the first century BCE\u00a0<a href=\"https:\/\/www.science.org\/doi\/10.1126\/science.aam5298\">used breeding strategies<\/a>\u00a0that selected for different coat colours and strong forelimbs, as well as the development of mammary glands \u2013 with the researchers identifying variants associated with these changes.<\/p>\n<p><strong>Wide insight<\/strong><\/p>\n<p>Meanwhile, research in this area not only provides insights into history and evolution, but also potential measures for horse welfare and conservation. In a study presented at the time as the\u00a0<a href=\"https:\/\/www.cell.com\/cell\/fulltext\/S0092-8674(19)30384-8?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0092867419303848%3Fshowall%3Dtrue\">largest DNA time series for a non-human organism to date<\/a>, researchers revealed that genetic diversity was retained for millennia after the first domestication of horses, but then tumbled 16% in the past two centuries \u2013 giving a basis for investigating the possible negative impacts of modern breeding.<\/p>\n<p>Knowing horses\u2019 past can also contribute to conservation strategies through activities such as rewilding. \u2018It\u2019s not just a pure scholarly exercise to answer those questions \u2013 it has consequences in the real world,\u2019 said Prof. Orlando. \u2018We can inform decision-makers on which populations should be prioritised for rewilding or for conservation.\u2019<\/p>\n<p>After the project\u2019s findings so far, Prof. Orlando hopes to dig into finer-grained detail about the past, with much still to uncover. \u2018We want to reinterpret some parts of history in terms of the power that some civilisations may have had over others thanks to horses,\u2019 said Prof. Orlando. \u2018Maybe some civilisations got a huge advantage because they managed to get a type of horse that others didn\u2019t.\u2019<\/p>\n<p>With PEGASUS having sought to build an unprecedented collection of horse fossil specimens from across Eurasia, the richness of such findings already and the capabilities of modern genomic sequencing techniques, the opportunities for uncovering developments in all sorts of areas \u2013 from biology and sociology to archaeology, history and linguistics \u2013 are substantial, said Prof. Orlando.<\/p>\n<p>And these techniques promise to keep enriching our understanding of how the flow of events has unfolded over time, he said. \u2018Our technologies have come to such a level that you can sequence so much across space and time that it becomes possible to draw arrows from one to the next.\u2019<\/p>\n<p>The research in this article was funded by the EU under the European Research Council (ERC).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Horses have been intrinsically entwined with human history for the past five millennia, acting as an early means of rapid transport and playing a key part in agriculture, warfare and sport. Despite this, major decades-long mysteries have surrounded where and how modern horses were first domesticated. Yet a large international team of zooarchaeologists, historians and &#8230; <a title=\"Quest to uncover the origins of horse taming is rewriting our picture of the past\" class=\"read-more\" href=\"https:\/\/scienceblog.com\/horizon\/1953\/quest-to-uncover-the-origins-of-horse-taming-is-rewriting-our-picture-of-the-past\/\" aria-label=\"Read more about Quest to uncover the origins of horse taming is rewriting our picture of the past\">Read more<\/a><\/p>\n","protected":false},"author":298,"featured_media":1954,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"generate_page_header":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[118],"tags":[],"class_list":["post-1953","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-social-sciences"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Quest to uncover the origins of horse taming is rewriting our picture of the past - Horizon Magazine Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/scienceblog.com\/horizon\/1953\/quest-to-uncover-the-origins-of-horse-taming-is-rewriting-our-picture-of-the-past\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Quest to uncover the origins of horse taming is rewriting our picture of the past\" \/>\n<meta property=\"og:description\" content=\"Horses have been intrinsically entwined with human history for the past five millennia, acting as an early means of rapid transport and playing a key part in agriculture, warfare and sport. 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Despite this, major decades-long mysteries have surrounded where and how modern horses were first domesticated. Yet a large international team of zooarchaeologists, historians and ... 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