Tag

Human Evolution

All articles tagged with #human evolution

science2 days ago•50 min saved

Ancient gut microbes traveled with humans from Africa to the Americas, study finds

A new study in Nature reveals that many gut bacteria co-migrated with humans out of Africa and into the Americas tens of thousands of years ago. Researchers compared the microbiomes of the Tsimane people in Bolivia and the Hadza in Tanzania, finding 1,231 shared microbial species. Most of these species are rare or absent in industrialized populations, suggesting a long-term co-evolution that is now being disrupted by modern lifestyles.

via Nature|

#anthropology #genetics #human-evolution

science2 days ago•39 min saved

Ethiopian Jaw Fossil Redraws Map of Ancient Paranthropus

A 2.6-million-year-old jaw fragment found in Ethiopia's Afar region is the first evidence of Paranthropus in the area, extending the genus's known range by over 1,000 kilometers north. Published in Nature, the discovery challenges previous theories that dietary limits or competition with Homo prevented the species from inhabiting northeastern Ethiopia. The fossil, designated MLP-3000, features unique anatomical traits, including a premolar with five root canals, suggesting early Paranthropus had greater ecological flexibility than previously assumed.

via The Brighter Side of News|

#afar-region #fossil-discovery #human-evolution

science4 days ago•37 min saved

Coastal Origins: New Evidence Suggests Human Evolution Began by the Sea 70,000 Years Ago

A new study suggests that the origins of modern humans may have begun by the sea approximately 70,000 years ago, challenging traditional inland-focused models of human evolution.

via GreekReporter.com|

#archaeology #coastal-origins #human-evolution

science7 days ago•97 min saved

3D reconstruction reveals the face and hairstyle of a 3,000-year-old Indigenous man from Ecuador

A forensic anthropologist has digitally reconstructed the face and hairstyle of a man who lived in Ecuador approximately 3,000 years ago, based on the Punin-2 skull. The reconstruction confirms the individual was a modern human with Native American ancestry, resolving a century-old debate about the skull's origins.

via Live Science|

#ancient-dna #archaeology #ecuador

biology13 days ago•8 min saved

Debate Intensifies Over Whether Culture Is Replacing Genes in Human Evolution

University of Maine researchers Timothy Waring and Zachary Wood argue that human evolution is shifting from genetic to cultural mechanisms, with institutions and technology now driving adaptation faster than natural selection. While they propose this could lead to a 'cultural superorganism,' peer-reviewed critiques challenge whether human societies meet the biological criteria for such an evolutionary transition.

via ZME Science|

#biology #bioscience #cultural-inheritance

science15 days ago•105 min saved

Human skeletal evolution driven by massive reduction in joint cartilage components

A comprehensive study in Nature maps how human-specific genetic changes in gene-regulatory regions led to a significant reduction in glycosaminoglycan (GAG) content in human joints. By analyzing over 560,000 DNA variants, researchers found that humans have approximately 62% less GAG in their cartilage compared to non-human apes. This evolutionary shift, which shows signs of natural selection, likely contributed to the development of human skeletal morphology but also explains why humans are far more susceptible to degenerative joint diseases like osteoarthritis than other great apes.

via Nature|

#gene-regulation #genetics #human-evolution

science16 days ago•5 min saved

Construction in Czech Republic Uncovers 27,000-Year-Old Mammoth Hunting Ground

Archaeologists in the Czech Republic have uncovered a massive Ice Age site containing the remains of at least 20 woolly mammoths, suggesting repeated human hunting activities approximately 27,000 years ago. The discovery, found beneath a construction site for a Justice Palace in Bukov, includes thousands of animal bones, stone tools, and evidence of butchery, offering rare insights into Late Gravettian human behavior in Bohemia.

via ScienceAlert|

#archaeology #czech-republic #human-evolution

science28 days ago•12 min saved

Neanderthal DNA Remains in Non-Africans After Thousands of Years of Interbreeding

Genetic evidence shows modern humans and Neanderthals overlapped and interbred long before Neanderthals vanished around 40,000 years ago; non-African populations today carry about 1–4% Neanderthal DNA (East Asians are a bit higher). The main admixture occurred roughly 45,000–49,000 years ago and continued for about 7,000 years, with ‘Neanderthal deserts’ indicating regions where archaic DNA was purged. The Oase man carried 6–9% Neanderthal DNA, illustrating very recent ancestry. Surviving Neanderthal fragments influence immune function, skin, and metabolism, and some variants are linked to disease risk such as severe COVID-19 on chromosome 3. In short, Neanderthals did not vanish from our genome—they left a lasting genetic legacy through interbreeding and natural selection.

via Space Daily|

#admixture #ancient-dna #genetics

anthropology28 days ago•22 min saved

Tiny Denisovan Arm Bone Reveals Big Clues About an Elusive Ancient Lineage

A 4.5 cm Denisovan forearm bone (radius) from Bianfu Cave in China shows a rare mix of Neanderthal-like joint surfaces and modern-human-like bone shape, filling a major anatomical gap in reconstructing the Denisovan arm and, alongside recent leg-bone findings suggesting extreme height, sheds light on what this elusive lineage looked like.

via ZME Science|

#anthropology #bianfu-cave #denisovans

science29 days ago•50 min saved

China's Yunnan Cave Sheds New Denisovan Details

Archaeologists in Yunnan, China, uncovered seven Denisovan fossils at Bianfu Cave, including two skull fragments, four teeth and a partial arm bone, found with bone- and stone-tools and fossil pollen and animal remains dating 167,000 to 134,000 years ago. The find provides the first direct Denisovan context in southern China, suggesting the group occupied diverse forests and hunted large prey. No ancient DNA was preserved, but protein analysis confirmed Denisovan identity for several bones and teeth, and researchers plan sediment DNA testing to better map their past range across Asia.

via Yahoo News Singapore|

#ancient-proteins #bianfu-cave #china-archaeology

science1 month ago•7 min saved

Denisovans Lived Among Yunnan Forests, New Cave Finds Reveal Their Life

Archaeologists in Bianfu Cave, Yunnan, China recovered Denisovan fossils (four teeth, an arm bone fragment and two skull fragments) with bone and stone tools dating to 167,000–134,000 years ago, suggesting Denisovans inhabited diverse Asian environments and hunted large game. DNA preservation was poor, but protein (amino acid) analysis helped assign the remains to Denisovans, making this site one of the few to link fossils with cultural remains in a single location.

via CNN|

#bianfu-cave #denisovans #human-evolution

science1 month ago•6 min saved

Scientists Propose Expanding the Homo Genus to Include Early Hominins

Monash University researchers argue that Australopithecus and Paranthropus species from the past 4-5 million years should be included in Homo, proposing that this expanded genus better reflects shared ancestry and the non-linear nature of the human family tree.

via SciTechDaily|

#australopithecus #genus-expansion #hominin-taxonomy

science1 month ago•6 min saved

Human-specific SRGAP2 gene may slow microglial maturation to bolster cognition

Researchers at Columbia's Zuckerman Institute found that human-specific copies of SRGAP2 are much more abundant in microglia than in neurons and slow microglial maturation to about four to eight years (versus roughly three weeks in mice). This coordinated, neotenic timing between microglia and neurons may help explain the human brain's developmental pace and its advanced cognitive abilities, with implications for understanding brain development and disease.

via Science Daily|

#brain-development #human-evolution #microglia

anthropology1 month ago•45 min saved

Hobbits' hips hint at human-like walking, study finds

A micro-CT analysis of the LB 1 pelvis of Homo floresiensis shows its features largely fall within modern human variation, suggesting upright, human-like walking—though slower and not optimized for long-distance travel—and shared traits with Homo erectus; the findings do not settle the hobbit's origins, which remain debated between descent from Homo erectus with island dwarfism or a small-bodied Pleistocene lineage; future ancient DNA or proteins could help resolve ancestry.

via Archaeology News Online Magazine|

#anthropology #bipedalism #homo-floresiensis

science1 month ago•50 min saved

Two Ghost Ancestors Leave DNA Footprints in Modern Humans

Researchers using TRACE analyzed more than 500 modern human genomes from Africa, Europe, and Asia and uncovered traces of two previously unknown ancestral lineages. One lineage interbred with humans in Africa more than 50,000 years ago and now accounts for about 0.5% to 1% of modern DNA, while an older 'super-archaic' lineage dates back roughly 1.8 million years, with no DNA recovered. These ghost lineages help explain how humans adapted to different environments and why certain diseases affect specific populations, with current DNA providing the closest evidence of these long-lost ancestors.

via Ground News|

#african-interbreeding #ancient-dna #ghost-lineages