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An international team led by the German Primate Center \u2013 Leibniz Institute for Primate Research (DPZ<\/a>) reports these findings in new research on Madagascar\u2019s primates.\u00a0<\/p>\n Lemurs<\/a> comprise more than 15 percent of today\u2019s living primate species even though their island home covers less than one percent of Earth\u2019s land. The study challenges a popular island narrative: that a single early radiation explains most living diversity.<\/p>\n Lemurs are strepsirrhines, an ancient primate branch that diverged from the haplorrhines \u2013 monkeys, apes<\/a>, and humans \u2013 over 70 million years ago.\u00a0<\/p>\n Their ancestors likely rafted to Madagascar roughly 53 million years ago and then adapted to a striking range of habitats, from humid rainforests to dry spiny thickets, coastal scrub, and mountains.\u00a0<\/p>\n Today, scientists recognize more than 100 species, with at least 16 more lost in just the past two millennia of human presence.<\/p>\n Multiple bursts, not one<\/p>\n The team analyzed genomic data from 79 lemur species spanning the island\u2019s main genera. Their phylogenetic reconstructions revealed a major uptick in speciation about five to six million years ago, long after the earliest lemur radiations.\u00a0<\/p>\n The surge centered on three genera that dominate modern diversity: mouse lemurs (Microcebus), true lemurs (Eulemur), and sportive lemurs (Lepilemur). Rather than evidence of a single ancient \u201cbig bang,\u201d the pattern points to repeated pulses of diversification layered across deep time.<\/p>\n The late burst surprised the researchers. In many groups, speciation rates peak early and then slow as ecological space fills. <\/p>\n Mouse lemurs, true lemurs, and sportive lemurs bucked that expectation.\u00a0They kept minting new species into the late Neogene and Pleistocene while also swapping genes across species boundaries within their genera.<\/p>\n Hybridization as an engine of novelty<\/p>\n The genomic signal of gene flow was clear. Species in the same genus sometimes interbred and produced hybrids, and those hybrids were not evolutionary dead ends. <\/p>\n In several clades, hybrid-origin species were even more common than \u201cclassic\u201d species formed solely by lineage splitting.<\/p>\n \u201cOur analyses show that lemurs split into new species much more frequently than their closest relatives, the lorises in Africa and Asia,\u201d explained Dietmar Zinner, a primate researcher in the Cognitive Ethology Laboratory at DPZ.\u00a0<\/p>\n \u201cWe were also able to show that genetic exchange, i.e. hybridization between species, was an important driver of this diversity.\u201d<\/p>\n Complex conditions of Madagascar<\/p>\n Zinner conducted the work with colleagues Peter Kappeler from the Behavioral Ecology and Sociobiology Unit and Christian Roos from the Primate Genetics Laboratory<\/a>.<\/p>\n On average, lemurs produced about 0.44 new species per million years across the tree, compared with only 0.15 per million years in lorises. In some groups, hybrid species outnumbered divergence-only species by a factor of four.\u00a0<\/p>\n That contrast demonstrates how Madagascar\u2019s complex landscapes and shifting climates<\/a> likely promoted both isolation and secondary contact, fueling cycles of split, mix, and split again.<\/p>\n Why lemurs outpaced lorises<\/p>\n Lorises, spread across Africa and Asia, share ancient ancestry with lemurs yet evolved under different ecological rules.\u00a0<\/p>\n Madagascar\u2019s isolation, its mosaic of microclimates, and repeated environmental swings may have carved and rejoined populations in ways that favored diversification.\u00a0<\/p>\n Small-bodied lineages such as mouse lemurs, with short generation times, could respond rapidly to new ecological opportunities or barriers. When range edges met again, occasional interbreeding would have injected novel combinations of genes that selection could act upon, speeding the emergence of distinct forms.<\/p>\n The study\u2019s timeline reaches into the middle and late Pleistocene. That means the island\u2019s living diversity is not just a relic of distant Eocene events but a product of more recent evolutionary churn.\u00a0<\/p>\n Even relatively young climatic oscillations could have opened and closed corridors, fostering the repeated radiations now written into lemur genomes.<\/p>\n Conservation message written in genes<\/p>\n The results carry immediate implications for conservation. Roughly 95 percent of lemur species are threatened as forests shrink and climate extremes intensify.\u00a0<\/p>\n Hybridization can be a source of diversity, but it can also erode distinctive lineages if human-driven habitat<\/a> change forces species into unnaturally high contact.<\/p>\n \u201cIn the future, conservation concepts must also take genetic diversity and the role of hybridization into account,\u201d Zinner said.<\/p>\n That means protecting not just species names but the evolutionary processes that generated them. Safeguarding intact, connected habitats across environmental gradients will help maintain opportunities for natural diversification while limiting risky, human-triggered genetic swamping.\u00a0<\/p>\n Moreover, genetic monitoring is also needed alongside field surveys to understand where boundaries are stable, porous, or shifting under pressure.<\/p>\n The future of lemur evolution <\/p>\n \u201cNevertheless, this is not a license to neglect species conservation,\u201d Roos said. \u201cWithout protective measures, many of the lemur species will go extinct before they can make use of this potential.\u201d<\/p>\n For researchers, the next steps are clear. More high-resolution genomic work is needed to pinpoint when and where hybridization shaped lineages, which environmental factors promoted it, and how often it produced adaptive breakthroughs. <\/p>\n That knowledge can guide strategies that respect natural evolutionary dynamics while preventing unintended outcomes.<\/p>\n \u201cThe more we know about their evolutionary history and genetic diversity<\/a>, the better we can secure their future,\u201d Roos concluded.<\/p>\n Madagascar\u2019s lemurs are a testament to what isolated landscapes and restless climates can sculpt. Their genomes show that evolution doesn\u2019t always proceed in a single burst; sometimes it occurs in waves.\u00a0<\/p>\n Protecting those waves \u2013 and the forests that make them possible \u2013 will determine whether this extraordinary experiment continues.<\/p>\n The study is published in the journal Nature Communications<\/a>.\u00a0<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"Lemurs didn\u2019t spring from a single explosive radiation after reaching Madagascar. Instead, their extraordinary variety arose through multiple…\n","protected":false},"author":2,"featured_media":105954,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[49,48,66,323],"class_list":{"0":"post-105953","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-wildlife","8":"tag-ca","9":"tag-canada","10":"tag-science","11":"tag-wildlife"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts\/105953","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/comments?post=105953"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts\/105953\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/media\/105954"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/media?parent=105953"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/categories?post=105953"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/tags?post=105953"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}