Thursday, April 2, 2020

Recent Archaeology News

Africa
 

Homo naledi juvenile remains offers clues to how our ancestors grew up

Jonathan Kantrowitz at Archaeology News Report - 19 hours ago
This rare case of an immature fossil hominin sheds light on the evolution of human development PLOS SHARE PRINT E-MAIL [image: IMAGE] IMAGE: HOMO NALEDI JUVENILE REMAINS OFFERS CLUES TO HOW OUR ANCESTORS GREW UP. view more CREDIT: BOLTER ET AL. PLOS ONE 2020 (CC BY) A partial skeleton of *Homo naledi* represents a rare case of an immature individual, shedding light on the evolution of growth and development in human ancestry, according to a study published April 1, 2020 in the open-access journal *PLOS ONE* by Debra Bolter of Modesto Junior College in California and the Univer... more »

Oldest ever human genetic evidence clarifies dispute over our ancestors

Jonathan Kantrowitz at Archaeology News Report - 19 hours ago
UNIVERSITY OF COPENHAGEN THE FACULTY OF HEALTH AND MEDICAL SCIENCES SHARE PRINT E-MAIL [image: IMAGE] IMAGE: SKELETAL REMAINS OF HOMO ANTECESSOR view more CREDIT: PROF. JOSÉ MARÍA BERMÚDEZ DE CASTRO Genetic information from an 800.000-year-old human fossil has been retrieved for the first time. The results from the University of Copenhagen shed light on one of the branching points in the human family tree, reaching much further back in time than previously possible. An important advancement in human evolution studies has been achieved after scientists retrieved the oldest human ... more »

Ancient hominins had small brains like apes, but longer childhoods like humans

Jonathan Kantrowitz at Archaeology News Report - 20 hours ago
UNIVERSITY OF CHICAGO MEDICAL CENTER SHARE PRINT E-MAIL [image: IMAGE] IMAGE: USING PRECISE IMAGING TECHNOLOGY TO SCAN FOSSIL SKULLS, RESEARCHERS FOUND THAT AS EARLY AS 3 MILLION YEARS AGO, CHILDREN HAD A LONG DEPENDENCE ON CAREGIVERS. view more CREDIT: COURTESY OF ZERAY ALEMSEGED Human ancestors that lived more than 3 million years ago had brains that were organized like chimpanzee brains, but had prolonged brain growth like humans, new research from the University of Chicago and other leading institutions shows. That means these hominins -- the species *Australopithecus afare... more »

Regular climbing behavior in a human ancestor

Jonathan Kantrowitz at Archaeology News Report - 1 day ago
A new study led by the University of Kent has found evidence that human ancestors as recent as two million years ago may have regularly climbed trees. Walking on two legs has long been a defining feature to differentiate modern humans, as well as extinct species on our lineage (aka hominins), from our closest living ape relatives: chimpanzees, gorillas and orangutans. This new research, based on analysis of fossil leg bones, provides evidence that a hominin species (believed to be either Paranthropus robustus or early Homo) regularly adopted highly flexed hip joints; a posture tha... more »
 

'Little Foot' skull reveals how this more than 3 million year old human ancestor lived

Jonathan Kantrowitz at Archaeology News Report - 2 weeks ago
Micro-CT scanning of 'Little Foot' skull reveals new aspects of the life of this more than 3-million year-old-human ancestor [image: IMAGE] IMAGE: COMPARISON OF THE NEARLY INTACT FIRST CERVICAL VERTEBRA OF 'LITTLE FOOT' AND TWO OTHER AUSTRALOPITHECUS FROM STERKFONTEIN IN SOUTH AFRICA AND FROM HADAR IN ETHIOPIA SHOWING HOW COMPLETE 'LITTLE FOOT'... view more CREDIT: AMÉLIE BEAUDET/WITS UNIVERSITY High-resolution micro-CT scanning of the skull of the fossil specimen known as "Little Foot" has revealed some aspects of how this *Australopithecus* species used to live more than 3 millio... more »
 

Eggshell beads exchanged over 30,000 years

Jonathan Kantrowitz at Archaeology News Report - 3 weeks ago
A clump of grass grows on an outcrop of shale 33,000 years ago. An ostrich pecks at the grass, and atoms taken up from the shale and into the grass become part of the eggshell the ostrich lays. A member of a hunter-gatherer group living in southern Africa's Karoo Desert finds the egg. She eats it, and cracks the shell into dozens of pieces. Drilling a hole, she strings the fragments onto a piece of sinew and files them into a string of beads. She gifts the ornaments to friends who live to the east, where rainfall is higher, to reaffirm those important relationships. They, in turn, do...more »
 
 

Human Populations survived the Toba volcanic super-eruption 74,000 years ago

Jonathan Kantrowitz at Archaeology News Report - 5 weeks ago
New archaeological work supports the hypothesis that human populations were present in India by 80,000 years ago and that they survived one of the largest volcanic eruptions in the last two million years MAX PLANCK INSTITUTE FOR THE SCIENCE OF HUMAN HISTORY SHARE PRINT E-MAIL [image: IMAGE] IMAGE: STONE TOOLS FOUND AT THE DHABA SITE CORRESPONDING WITH THE TOBA VOLCANIC SUPER-ERUPTION LEVELS. PICTURED HERE ARE DIAGNOSTIC MIDDLE PALAEOLITHIC CORE TYPES.view more CREDIT: CHRIS CLARKSON The Toba super-eruption was one of the largest volcanic events over the last two million years,... more »

Neanderthals

New research adds to growing evidence that our ancestors interbred with Neanderthals at multiple times in history

Jonathan Kantrowitz at Archaeology News Report - 20 hours ago
In recent years, scientists have uncovered evidence that modern humans and Neanderthals share a tangled past. In the course of human history, these two species of hominins interbred not just once, but at multiple times, the thinking goes. A new study supports this notion, finding that people in Eurasia today have genetic material linked to Neanderthals from the Altai mountains in modern-day Siberia. This is noteworthy because past research has shown that Neanderthals connected to a different, distant location -- the Vindija Cave in modern-day Croatia -- have also contributed DNA to ... more »

Neanderthals ate mussels, fish, and seals too

Jonathan Kantrowitz at Archaeology News Report - 6 days ago
Over 80,000 years ago, Neanderthals were already feeding themselves regularly on mussels, fish and other marine life. The first robust evidence of this has been found by an international research team with the participation of the University of Göttingen during an excavation in the cave of Figueira Brava in Portugal. Dr Dirk Hoffmann at the Göttingen Isotope Geology Department dated flowstone layers - calcite deposits that form like stalagmites from dripping water - using the uranium-thorium method, and was thus able to determine the age of the excavation layers to between 86,000 a... more »

Neanderthal migration to Southern Siberia

Jonathan Kantrowitz at Archaeology News Report - 4 weeks ago
At least two different groups of Neanderthals lived in Southern Siberia and an international team of researchers including scientists from Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) have now proven that one of these groups migrated from Eastern Europe. The researchers have now published their findings in the journal *Proceedings of the National Academy of Sciences* of the United States of America (*PNAS*). Neanderthals were widespread in Europe and also migrated to Southern Siberia, but the origins of these Siberian Neanderthals and when they migrated was not known. An ... more »
 
Americas

Well-engineered 'watercourts' stored live fish, fueling Florida's Calusa kingdom

Jonathan Kantrowitz at Archaeology News Report - 1 day ago
FLORIDA MUSEUM OF NATURAL HISTORY SHARE PRINT E-MAIL [image: IMAGE] IMAGE: THE FISH SURPLUS STORED IN WATERCOURTS LIKELY ENABLED THE CALUSA TO COMPLETE LARGE-SCALE CONSTRUCTION PROJECTS. THE LARGEST WATERCOURT WAS BUILT DURING A KEY CONSTRUCTION PHASE OF THE KING'S MANOR ON... view more CREDIT: MERALD CLARK/FLORIDA MUSEUM GAINESVILLE, Fla. --- The mighty Calusa ruled South Florida for centuries, wielding military power, trading and collecting tribute along routes that sprawled hundreds of miles, creating shell islands, erecting enormous buildings and dredging canals wider than ... more »

Mesoamerican copper smelting technology aided colonial weaponry

Jonathan Kantrowitz at Archaeology News Report - 1 day ago
When Spanish invaders arrived in the Americas, they were generally able to subjugate the local peoples thanks, in part, to their superior weaponry and technology. But archeological evidence indicates that, in at least one crucial respect, the Spaniards were quite dependent on an older indigenous technology in parts of Mesoamerica (today's Mexico, Guatemala, Belize, and Honduras). The invaders needed copper for their artillery, as well as for coins, kettles, and pans, but they lacked the knowledge and skills to produce the metal. Even Spain at that time had not produced the metal dom... more »

Guatemala find reveals early Mayan writing

Jonathan Kantrowitz at Archaeology News Report - 6 days ago
Complete article This undated handout picture by the Tak'alik Ab'aj Archaeologial National Park released by the Guatemalan Ministry of Culture and Sports shows a stone at the Tak'alik Ab'aj archaeological site, in El Asintal municipality, Retalhuleu department, Guatemala. A 2,000 year-old stone discovered in Guatemala in 2018 releals the beginning of writing in the Mayan culture, which dominated the south of Mexico and part of Central America, informed experts on March 10, 2020. Guatemalan Ministry of Culture and Sports / AFP. A 2,000 year old stela recently discovered in Guatema... more »
 

Maize, not metal, key to native settlements' history in NY

Jonathan Kantrowitz at Archaeology News Report - 1 week ago
New Cornell University research is producing a more accurate historical timeline for the occupation of Native American sites in upstate New York, based on radiocarbon dating of organic materials and statistical modeling. The results from the study of a dozen sites in the Mohawk Valley were recently published in the online journal *PLoS ONE* by Sturt Manning, professor of classical archaeology; and John Hart, curator in the research and collections division of the New York State Museum in Albany. The findings, Manning said, are helping to refine our understanding of the social, polit... more »
 

Violence accompanied the growth of agriculture in Eastern North America 7,500 to 5,000 years ago

Jonathan Kantrowitz at Archaeology News Report - 4 weeks ago
E-MAIL The growth of agriculture led to unprecedented cooperation in human societies, a team of researchers, has found, but it also led to a spike in violence, an insight that offers lessons for the present. A new study out today in *Environmental Archaeology* by collaborators from UConn, the University of Utah, Troy University, and California State University, Sacramento examines the growth of agriculture in Eastern North America 7,500 to 5,000 years ago, and finds that while the domestication of plants fostered new cooperation among people, it also saw the rise of organized, int...more »
 
 
Miscellaneous

Prehistoric artifacts suggest a neolithic era independently developed in New Guinea

Jonathan Kantrowitz at Archaeology News Report - 1 week ago
Emergence of a Neolithic in highland New Guinea by 5,000 to 4,000 years ago New artifacts uncovered at the Waim archaeological site in the highlands of New Guinea - including a fragment of the earliest symbolic stone carving in Oceania - illustrate a shift in human behavior between 5050 and 4200 years ago in response to the widespread emergence of agriculture, ushering in a regional Neolithic Era similar to the Neolithic in Eurasia. The location and pattern of the artifacts at the site suggest a fixed domestic space and symbolic cultural practices, hinting that the region began to... more »

Global human genomes reveal rich genetic diversity shaped by complex evolutionary history

Jonathan Kantrowitz at Archaeology News Report - 1 week ago
A new study has provided the most comprehensive analysis of human genetic diversity to date, after the sequencing of 929 human genomes by scientists at the Wellcome Sanger Institute, the University of Cambridge and their collaborators. The study uncovers a large amount of previously undescribed genetic variation and provides new insights into our evolutionary past, highlighting the complexity of the process through which our ancestors diversified, migrated and mixed throughout the world. The resource, published in *Science* (20 March), is the most detailed representation of the gene... more »

Ancient mantis-man petroglyph discovered in Iran

Jonathan Kantrowitz at Archaeology News Report - 2 weeks ago
A unique rock carving found in the Teymareh rock art site (Khomein county) in Central Iran with six limbs has been described as part man, part mantis. Rock carvings, or petroglyphs, of invertebrate animals are rare, so entomologists teamed up with archaeologists to try and identify the motif. They compared the carving with others around the world and with the local six-legged creatures which its prehistoric artists could have encountered. CAPTION The 'squatter mantis man' petroglyph next to a 10 cm scale bar. CREDIT Dr. Mohammad Naserifard Entomologists Mahmood Kolnegari, Islamic A... more »
 

Hunter-gatherer networks accelerated human evolution

Jonathan Kantrowitz at Archaeology News Report - 4 weeks ago
SHARE PRINT E-MAIL Volume 90% VIDEO: THE NETWORKS OF HUNTER-GATHERER ACCELERATED THE HUMAN EVOLUTION. view more CREDIT: UZH Humans began developing a complex culture as early as the Stone Age. This development was brought about by social interactions between various groups of hunters and gatherers, a UZH study has now confirmed. The researchers mapped the social networks of present-day hunter-gatherers in the Philippines and simulated the discovery of a medicinal plant product. Around 300,000 years ago, our ancestors lived in small communities as hunters and gatherers. This ... more »

Anthropogenic seed dispersal: rethinking the origins of plant domestication

Jonathan Kantrowitz at Archaeology News Report - 4 weeks ago
In a new manuscript, Dr. Robert Spengler argues that all of the earliest traits of plant domestication are linked to a mutualistic relationship in which plants recruited humans for seed dispersal MAX PLANCK INSTITUTE FOR THE SCIENCE OF HUMAN HISTORY SHARE PRINT E-MAIL [image: IMAGE] IMAGE: A PHOTO OF AN EAR FROM A WILD BARLEY PLANT, WITH THE RIPE SEEDS NATURALLY SHATTERING OFF DUE TO THE BRITTLE RACHIS OR STEM STRUCTURE AT THEIR BASE. IN THE... view more CREDIT: ROBERT SPENGLER The plants we consume for food have changed drastically in the 10,000 years since humans began practi... more »
Europe

Study offers new insight into the impact of ancient migrations on the European landscape

Jonathan Kantrowitz at Archaeology News Report - 20 hours ago
UNIVERSITY OF PLYMOUTH SHARE PRINT E-MAIL [image: IMAGE] IMAGE: A GRAPHIC DEPICTING THE SPREAD OF YAMNAYA ANCESTRY OVER TIME OVER A PERIOD OF AROUND 8,000 YEARS view more CREDIT: FERNANDO RACIMO Neolithic populations have long been credited with bringing about a revolution in farming practices across Europe. However, a new study suggests it was not until the Bronze Age several millennia later that human activity led to significant changes to the continent's landscape. Scientists from the University of Copenhagen and the University of Plymouth led research tracing how the two ma... more »
 

Bone analyzes tell about kitchen utensils in the Middle Ages

Jonathan Kantrowitz at Archaeology News Report - 1 week ago
Clay pots? Wooden spoons? Copper pots? Silver forks? What materials has man used for making kitchen utensils throughout history? A new study now sheds light on the use of kitchen utensils made of copper. At first thought, you would not expect hundreds of years old bones from a medieval cemetery to be able to tell you very much - let alone anything about what kinds of kitchen utensils were used to prepare food. But when you put such a bone in the hands of Professor Kaare Lund Rasmussen, University of Southern Denmark, the bone begins to talk about the past. A warehouse full of bones -... more »

Mysterious bone circles made from the remains of mammoths reveal clues about Ice Age

Jonathan Kantrowitz at Archaeology News Report - 2 weeks ago
UNIVERSITY OF EXETER SHARE PRINT E-MAIL [image: IMAGE] IMAGE: THE MAJORITY OF THE BONES FOUND AT THE SITE INVESTIGATED, IN THE RUSSIAN PLAINS, ARE FROM MAMMOTHS. A TOTAL OF 51 LOWER JAWS AND 64 INDIVIDUAL MAMMOTH SKULLS WERE USED... view more CREDIT: ALEX PRYOR Mysterious bone circles made from the remains of dozens of mammoths have revealed clues about how ancient communities survived Europe's ice age. About 70 of these structures are known to exist in Ukraine and the west Russian Plain. New analysis shows the bones at one site are more than 20,000 years old, making it the old... more »

Bronze Age diet and farming strategy reconstructed using integrative isotope analysis

Jonathan Kantrowitz at Archaeology News Report - 3 weeks ago
The El Algar society thrived in complex hilltop settlements across the Iberian Peninsula from 2200-1550 cal BCE, and gravesites and settlement layouts provide strong evidence of a marked social hierarchy. Knipper and colleagues conducted carbon and nitrogen isotope analysis at two different El Algar hilltop settlements: the large fortified urban site La Bastida (in present-day Totana, Murcia), and the smaller settlement Gatas (Turre, Almería). Their sample included remains of 75 human individuals from across social strata, 28 bones from domestic animals and wild deer, charred barle... more »

Each Mediterranean island has its own genetic pattern

Jonathan Kantrowitz at Archaeology News Report - 5 weeks ago
CAPTION Researchers found a large proportion of North African ancestry in one of the studied individuals who lived in Sardinia during the second half of the 3rd millennium BC. CREDIT © David Caramelli The Mediterranean Sea has been a major route for maritime migrations as well as frequent trade and invasions during prehistory, yet the genetic history of the Mediterranean islands is not well documented despite recent developments in the study of ancient DNA. An international team led by researchers from the University of Vienna, Harvard University and University of Florence, Italy, i... more »

 

Asia

Tang Dynasty noblewoman buried with her donkeys, for the love of polo

Jonathan Kantrowitz at Archaeology News Report - 2 weeks ago
A noblewoman from Imperial China enjoyed playing polo on donkeys so much she had her steeds buried with her so she could keep doing it in the afterlife, archaeologists found. This discovery by a team that includes Fiona Marshall, the James W. and Jean L. Davis Professor in Arts & Sciences at Washington University in St. Louis, is published March 17 in the journal *Antiquity*. The research provides the first physical evidence of donkey polo in Imperial China, which previously was only known from historical texts. It also sheds light on the role for donkeys in the lives of high status... more »

How millets sustained Mongolia's empires

Jonathan Kantrowitz at Archaeology News Report - 4 weeks ago
The historic economies of Mongolia are among the least understood of any region in the world. The region's persistent, extreme winds whisk away signs of human activity and prevent the buildup of sediment which archaeologists rely on to preserve the past. Today crop cultivation comprises only a small percent of Mongolia's food production, and many scholars have argued that Mongolia presents a unique example of dense human populations and hierarchical political systems forming without intensive farming or stockpiling grains. The current study, led by Dr. Shevan Wilkin of the Max Planc... more »

5,000-year-old milk proteins point to the importance of dairying in eastern Eurasia

Jonathan Kantrowitz at Archaeology News Report - 4 weeks ago
Today dairy foods sustain and support millions around the world, including in Mongolia, where dairy foods make up to 50% of calories consumed during the summer. Although dairy-based pastoralism has been an essential part of life and culture in the eastern Eurasian Steppe for millennia, the eastward spread of dairying from its origin in southwest Asia and the development of these practices is little understood. The current study, led by Shevan Wilkin and Jessica Hendy of the Max Planck Institute for the Science of Human History, presents the earliest evidence for dairy consumption in... more »

Wednesday, April 1, 2020

Homo naledi juvenile remains offers clues to how our ancestors grew up


This rare case of an immature fossil hominin sheds light on the evolution of human development
PLOS
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IMAGE: HOMO NALEDI JUVENILE REMAINS OFFERS CLUES TO HOW OUR ANCESTORS GREW UP. view more 
CREDIT: BOLTER ET AL. PLOS ONE 2020 (CC BY)
A partial skeleton of Homo naledi represents a rare case of an immature individual, shedding light on the evolution of growth and development in human ancestry, according to a study published April 1, 2020 in the open-access journal PLOS ONE by Debra Bolter of Modesto Junior College in California and the University of the Witwatersrand, Johannesburg, and colleagues.
Much research has gone into the evolution of ancient hominins - human relatives and ancestors - but little is known about their growth and development. Most hominin fossils represent adult individuals, and remains of developmentally young hominins are rare. This has left a gap in our understanding of how our ancient relatives grew from young into adults, and how modern human growth patterns evolved.
In this study, Bolter and colleagues examined fossils from the Dinaledi Chamber of the Rising Star Cave System in South Africa. This site is famous for providing abundant remains of the hominin Homo naledi, including individuals ranging from infants to adult. These fossils date to the late Middle Pleistocene, between 335,000 and 226,000 years ago, possibly overlapping in time with the earliest members of our own species. The team identified a collection of arm and leg bones and a partial jaw as the remains of a single young individual designated DH7.
The bones and teeth of DH7 were not fully developed and display a mixture of maturity patterns seen in modern humans and earlier hominins. DH7 is estimated to be similar in its developmental stage to immature specimens of other fossil hominins between 8-11 years old at death. The authors note, however, that if Homo naledi had a slower growth rate like modern humans, DH7 might have been as old as 15. Further study is needed to assess how Homo naledi grew and where it fits into the evolution of human growth and development.
Bolter adds: The rare juvenile Homo naledi partial skeleton will shed light on whether this extinct species is more human-like in its development, or more primitive. The findings help reconstruct the selective pressures that shaped extended maturity in our own species.
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Oldest ever human genetic evidence clarifies dispute over our ancestors


UNIVERSITY OF COPENHAGEN THE FACULTY OF HEALTH AND MEDICAL SCIENCES
IMAGE
IMAGE: SKELETAL REMAINS OF HOMO ANTECESSOR view more 
CREDIT: PROF. JOSÉ MARÍA BERMÚDEZ DE CASTRO
Genetic information from an 800.000-year-old human fossil has been retrieved for the first time. The results from the University of Copenhagen shed light on one of the branching points in the human family tree, reaching much further back in time than previously possible.
An important advancement in human evolution studies has been achieved after scientists retrieved the oldest human genetic data set from an 800,000-year-old tooth belonging to the hominin species Homo antecessor.
The findings by scientists from the University of Copenhagen (Denmark), in collaboration with colleagues from the CENIEH (National Research Center on Human Evolution) in Burgos, Spain, and other institutions, are published April 1st in Nature.
"Ancient protein analysis provides evidence for a close relationship between Homo antecessor, us (Homo sapiens), Neanderthals, and Denisovans. Our results support the idea that Homo antecessor was a sister group to the group containing Homo sapiens, Neanderthals, and Denisovans", says Frido Welker, Postdoctoral Research Fellow at the Globe Institute, University of Copenhagen, and first author on the paper.
Reconstructing the human family tree
By using a technique called mass spectrometry, researchers sequenced ancient proteins from dental enamel, and confidently determined the position of Homo antecessor in the human family tree.
The new molecular method, palaeoproteomics, developed by researchers at the Faculty of Health and Medical Sciences, University of Copenhagen, enables scientists to retrieve molecular evidence to accurately reconstruct human evolution from further back in time than ever before.
The human and the chimpanzee lineages split from each other about 9-7 million years ago. Scientists have relentlessly aimed to better understand the evolutionary relations between our species and the others, all now extinct, in the human lineage.
"Much of what we know so far is based either on the results of ancient DNA analysis, or on observations of the shape and the physical structure of fossils. Because of the chemical degradation of DNA over time, the oldest human DNA retrieved so far is dated at no more than approximately 400.000 years", says Enrico Cappellini, Associate Professor at the Globe Institute, University of Copenhagen, and leading author on the paper.
"Now, the analysis of ancient proteins with mass spectrometry, an approach commonly known as palaeoproteomics, allow us to overcome these limits", he adds.
Theories on human evolution
The fossils analyzed by the researchers were found by palaeoanthropologist José María Bermúdez de Castro and his team in 1994 in stratigraphic level TD6 from the Gran Dolina cave site, one of the archaeological and paleontological sites of the Sierra de Atapuerca, Spain.
Initial observations led to conclude that Homo antecessor was the last common ancestor to modern humans and Neanderthals, a conclusion based on the physical shape and appearance of the fossils. In the following years, the exact relation between Homo antecessorand other human groups, like ourselves and Neanderthals, has been discussed intensely among anthropologists.
Although the hypothesis that Homo antecessor could be the common ancestor of Neanderthals and modern humans is very difficult to fit into the evolutionary scenario of the genus Homo, new findings in TD6 and subsequent studies revealed several characters shared among the human species found in Atapuerca and the Neanderthals. In addition, new studies confirmed that the facial features of Homo antecessor are very similar to those of Homo sapiens and very different from those of the Neanderthals and their more recent ancestors.
"I am happy that the protein study provides evidence that the Homo antecessor species may be closely related to the last common ancestor of Homo sapiens, Neanderthals, and Denisovans. The features shared by Homo antecessor with these hominins clearly appeared much earlier than previously thought. Homo antecessor would therefore be a basal species of the emerging humanity formed by Neanderthals, Denisovans, and modern humans", adds José María Bermúdez de Castro, Scientific Co-director of the excavations in Atapuerca and co-corresponding author on the paper.
World class-expertise
Findings like these are made possible through an extensive collaboration between different research fields: from paleoanthropology to biochemistry, proteomics and population genomics.
Retrieval of ancient genetic material from the rarest fossil specimens requires top quality expertise and equipment. This is the reason behind the now ten-years-long strategic collaboration between Enrico Cappellini and Jesper Velgaard Olsen, Professor at the Novo Nordisk Foundation Center for Protein Research, University of Copenhagen and co-author on the paper.
"This study is an exciting milestone in palaeoproteomics. Using state of the art mass spectrometry, we determine the sequence of amino acids within protein remains from Homo antecessor dental enamel. We can then compare the ancient protein sequences we 'read' to those of other hominins, for example Neanderthals and Homo sapiens, to determine how they are genetically related", says Jesper Velgaard Olsen.
"I really look forward to seeing what palaeoproteomics will reveal in the future", concludes Enrico Cappellini.

Ancient hominins had small brains like apes, but longer childhoods like humans


UNIVERSITY OF CHICAGO MEDICAL CENTER
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IMAGE: USING PRECISE IMAGING TECHNOLOGY TO SCAN FOSSIL SKULLS, RESEARCHERS FOUND THAT AS EARLY AS 3 MILLION YEARS AGO, CHILDREN HAD A LONG DEPENDENCE ON CAREGIVERS. view more 
CREDIT: COURTESY OF ZERAY ALEMSEGED
Human ancestors that lived more than 3 million years ago had brains that were organized like chimpanzee brains, but had prolonged brain growth like humans, new research from the University of Chicago and other leading institutions shows.
That means these hominins -- the species Australopithecus afarensis, made famous by the Lucy and Dikika child fossils found in Ethiopia -- had a mosaic of ape and human features, a hallmark of evolution.
By using precise technology to scan eight fossil skulls from this region, the researchers also resolved a longstanding question of whether this species had prolonged childhood, a period of time unique to humans that allows us to learn and grow.
"As early as 3 million years ago, children had a long dependence on caregivers," said Zeresenay (Zeray) Alemseged, PhD, Donald N. Pritzker Professor of Organismal Biology and Anatomy and senior author of the research, published April 1 in the journal Science Advances. "That gave children more time to acquire cognitive and social skills. By understanding that childhood emerged 3.5 million years ago, we are establishing the timing for the advent of this milestone event in human evolution."
Alemseged, who discovered the Dikika child fossil in 2000 and leads the Dikika field project in Ethiopia, has studied its species for decades and helped design the new research. Widely accepted to be ancestral to all later hominins, including humans, Australopithecus afarensislived in East Africa more than 3 million years ago and had many human-like features: They walked upright, had brains that were 20% larger than chimpanzees and may have used sharp stone tools.
But many questions about the species remain unresolved, including whether its brain was organized like humans -- which could indicate more complex behaviors, like communication -- and whether it also had protracted brain growth.
When Alemseged discovered the Dikika child, he used a CT scan to examine its skull, and by studying its teeth determined that its age at time of death was around 3 years. To understand how the child's brain was organized, however, he needed more precise imaging technology, so his team used synchrotron-computed tomography -- which uses extremely powerful X-rays to reveal detailed information about a material's structure -- to scan the child's skull and seven other skulls from the same region.
While brains do not fossilize, they do leave imprints on the inside of the skull. With the scans, the researchers could measure endocranial volume, and see the placement of the lunate sulcus -- a fissure that separates the anterior and posterior parts of the brain. This placement differs in humans and chimpanzees -- in humans, who have a large prefrontal cortex, the fissure is pushed further down in the brain. In chimpanzees, the fissure is closer to the front. The scans revealed that Australopithecus afarensis had a lunate sulcus in a similar position to the fissure found in chimpanzee brains.
"This resolves a contentious argument that has polarized paleontologists for years," Alemseged said. "We can now say the organization of the brain was more ape-like."
Did that mean that the species acted more like chimpanzees? Not necessarily. The group of researchers also used synchrotron-computed tomographic scans to count the Dikika child's dental growth lines. Similar to growth rings in trees, these growth lines can show the exact birth and death date of the child. The team's dental experts then calculated the child's age as 2.4 years.
"That allows you to ask how much of the brain was formed at that given age," Alemseged said.
When researchers compared the child's endocranial volume to that of a chimpanzee and humans, they found that brain development in Australopithecus afarensis was protracted, like in humans today. That meant the species had a long childhood, which laid the foundation for subsequent evolution of the brain and social behavior that differentiates humans today.
Alemseged's collaborators on this research were from the Max Planck Institute for Evolutionary Anthropology, Florida State University, the School for Advanced Research, the European Synchrotron Radiation Facility, Griffith University, Arizona State University, the Natural History Museum of London, and University College London.
The Dikka child, known as Selam (which means "peace" in the Ethiopian Amharic language), has been the source of several important papers on human evolution. Alemseged's graduate students are still studying the fossil, looking at the development of its face and shoulder growth. Ultimately, Alemseged hopes to compile everything that he and his lab have discovered about the fossil into one compendium.
"This fossil has played a pivotal role in allowing paleoanthropologists to ask and answer several major questions about how we became human," he said.

New research adds to growing evidence that our ancestors interbred with Neanderthals at multiple times in history

 In recent years, scientists have uncovered evidence that modern humans and Neanderthals share a tangled past. In the course of human history, these two species of hominins interbred not just once, but at multiple times, the thinking goes.
A new study supports this notion, finding that people in Eurasia today have genetic material linked to Neanderthals from the Altai mountains in modern-day Siberia. This is noteworthy because past research has shown that Neanderthals connected to a different, distant location -- the Vindija Cave in modern-day Croatia -- have also contributed DNA to modern-day Eurasian populations.
The results reinforce the concept that Neanderthal DNA has been woven into the modern human genome on multiple occasions as our ancestors met Neanderthals time and again in different parts of the world.
The study was published on March 31 in the journal Genetics.
"It's not a single introgression of genetic material from Neanderthals," says lead researcher Omer Gokcumen, a University at Buffalo biologist. "It's just this spider web of interactions that happen over and over again, where different ancient hominins are interacting with each other, and our paper is adding to this picture. This project will now add to an emerging chorus -- we've been looking into this phenomenon for a couple of years, and there are a couple of papers that came out recently that deal with similar concepts."
"The picture in my mind now is we have all these archaic hominin populations in Europe, in Asia, in Siberia, in Africa. For one reason or another, the ancestors of modern humans in Africa start expanding in population, and as they expand their range, they meet with these other hominins and absorb their DNA, if you will," Gokcumen says. "We probably met different Neanderthal populations at different times in our expansion into other parts of the globe."
Gokcumen, associate professor of biological sciences in the UB College of Arts and Sciences, led the study with first author Recep Ozgur Taskent, a recent UB PhD graduate in the department. Co-authors include UB PhD graduate Yen Lung Lin, now a postdoctoral scholar at the University of Chicago; and Ioannis Patramanis and Pavlos Pavlidis, PhD, of the Foundation for Research and Technology in Greece.
The research was funded by the U.S. National Science Foundation.
To complete the project, scientists analyzed the DNA of hundreds of people of Eurasian ancestry. The goal was to hunt for fragments of genetic material that may have been inherited from Neanderthals.
This research found that the Eurasian populations studied could trace some genetic material back to two different Neanderthal lineages: one represented by a Neanderthal whose remains were discovered in the Vindija cave in Croatia, and another represented by a Neanderthal whose remains were discovered in the Altai mountains in Russia.
Scientists also discovered that the modern-day populations they studied also share genetic deletions -- areas of DNA that are missing -- with both the Vindija and Altai Neanderthal lineages.
The DNA of the Vindija and Altai Neanderthals, along with the modern human populations studied, were previously sequenced by different research teams.
"It seems like the story of human evolution is not so much like at tree with branches that just grow in different directions. It turns out that the branches have all these connections between them," Gokcumen says. "We are figuring out these connections, which is really exciting. The story is not as neat as it was before. Every single ancient genome that is sequenced seems to create a completely new perspective in our understanding of human evolution, and every new genome that's sequenced in the future may completely change the story again."

Study offers new insight into the impact of ancient migrations on the European landscape


UNIVERSITY OF PLYMOUTH
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IMAGE: A GRAPHIC DEPICTING THE SPREAD OF YAMNAYA ANCESTRY OVER TIME OVER A PERIOD OF AROUND 8,000 YEARS view more 
CREDIT: FERNANDO RACIMO
Neolithic populations have long been credited with bringing about a revolution in farming practices across Europe. However, a new study suggests it was not until the Bronze Age several millennia later that human activity led to significant changes to the continent's landscape.
Scientists from the University of Copenhagen and the University of Plymouth led research tracing how the two major human migrations recorded in Holocene Europe - the northwestward movement of Anatolian farmer populations during the Neolithic and the westward movement of Yamnaya steppe peoples during the Bronze Age - unfolded.
In particular, they analysed how they were associated with changes in vegetation - which led to Europe's forests being replaced with the agricultural landscape still much in evidence today.
Their results, published in PNAS, show the two migrations differ markedly in both their spread and environmental implications, with the Yamnaya expansion moving quicker and resulting in greater vegetation changes than the earlier Neolithic farmer expansion.
The study - also involving the University of Gothenburg and the University of Cambridge - used techniques commonly applied in environmental science to model climate and pollution, and applied them to instead analyse human population movements in the last 10 millennia of European history.
It showed that a decline in broad-leaf forest and an increase in pasture and natural grassland vegetation was concurrent with a decline in hunter-gatherer ancestry, and may have been associated with the fast movement of steppe peoples during the Bronze Age.
It also demonstrated that natural variations in climate patterns during this period are associated with these land cover changes.
The research is the ?rst to model the spread of ancestry in ancient genomes through time and space, and provides the ?rst framework for comparing human migrations and land cover changes, while also accounting for changes in climate.
Dr Fernando Racimo, Assistant Professor at the University of Copenhagen and the study's lead author, said: "The movement of steppe peoples that occurred in the Bronze Age had a particularly strong impact on European vegetation. As these peoples were moving westward, we see increases in the amount of pasture lands and decreases in broad leaf forests throughout the continent. We can now also compare movements of genes to the spread of cultural packages. In the case of the Neolithic farming revolution, for example, the two track each other particularly well, in both space and time."
The research made use of land cover maps showing vegetation change over the past 11,000 years, which were produced through the University of Plymouth's Deforesting Europe project.
Scientists working on that project have previously shown more than half of Europe's forests have disappeared over the past 6,000 years due to increasing demand for agricultural land and the use of wood as a source of fuel.
Dr Jessie Woodbridge, Research Fellow at the University of Plymouth and co-author on the study, added: "European landscapes have been transformed drastically over thousands of years. Knowledge of how people interacted with their environment in the past has implications for understanding the way in which people use and impact upon the world today. Collaboration with palaeo-geneticists has allowed the migration of human populations in the past to be tracked using ancient DNA, and for the first time allowed us to assess the impact of different farming populations on land-cover change, which provides new insights into past human-environment interactions."