Thursday, November 12, 2020

Population dynamics and the rise of empires in Inner Asia

 From the late Bronze Age until the Middle Ages, the eastern Eurasian Steppe was home to a series of organized and highly influential nomadic empires. The Xiongnu (209 BCE -- 98 CE) and Mongol (916-1125 CE) empires that bookend this period had especially large impacts on the demographics and geopolitics of Eurasia, but due to a lack of large-scale genetic studies, the origins, interactions, and relationships of the people who formed these states remains largely unknown.

To understand the population dynamics that gave rise to the Steppe's historic empires, researchers from the Max Planck Institute for the Science of Human History (MPI-SHH), the National University of Mongolia, and partner institutions in Mongolia, Russia, Korea and the United States generated and analyzed genome-wide data for 214 individuals from 85 Mongolian and 3 Russian sites. Spanning the period of 4600 BCE to 1400 CE, it is among the largest studies of ancient Eastern and Inner Asian genomes to date.

During the mid-Holocene, the eastern Eurasian Steppe was populated by hunter-gatherers of Ancient Northeast Asian (ANA) and Ancient Northern Eurasian (ANE) ancestry, but around 3000 BCE, dairy pastoralism was introduced through the expansion of the Afanasievo culture of the Altai mountains, whose origins can be traced to the Yamnaya steppe herders of the Black Sea region more than 3,000 km to the west. Although these migrants left little genetic impact, they had an outsized cultural effect and by the Mid- to Late Bronze Age, dairy pastoralism was practiced by populations throughout the Eastern Steppe.

In the Late Bronze Age and Early Iron Age, populations in west, north and south-central Mongolia formed three distinct, geographically structured gene pools. These populations remained discrete for more than a millennium, until increased mobility, likely facilitated by the rise of horseback riding, began to break down this structure. The formation of the Xiongnu in north-central Mongolia, the first nomadic empire in Asia, is contemporaneous with this population mixture and with the influx of new gene pools originating from across Eurasia, from the Black Sea to China.

"Rather than a simple genetic turnover or replacement, the rise of the Xiongnu is linked to the sudden mixture of distinct populations that had been genetically separated for millennia. As a result, the Xiongnu of Mongolia show a spectacular level of genetic diversity that reflects much of Eurasia," says Dr. Choongwon Jeong, lead author of the study and a professor of Biological Sciences at Seoul National University.

A thousand years later, individuals from the Mongol Empire, one of largest contiguous empires in history, showed a marked increase in Eastern Eurasian ancestry compared to individuals from the earlier Xiongnu, Turkic and Uyghur periods, accompanied by a near complete loss of the ancient ANE ancestry that had been present since before the Xiongnu Empire. By the end of the Mongol Empire, the genetic makeup of the Eastern Steppe had changed dramatically, ultimately stabilizing into the genetic profile observed among present-day Mongolians.

"Our study of ancient Mongolia reveals not only early genetic contributions from populations on the Western Steppe, but also a marked genetic shift towards eastern Eurasian ancestry during the Mongol Empire. The region has a remarkably dynamic genetic history, and ancient DNA is beginning to reveal the complexity of population events that have shaped the Eurasian Steppe," says Ke Wang, co-first author of the study and a PhD student at the MPI-SHH.

In addition to the impacts of genetic events on political structures, the researchers also investigated the relationship between genetics and subsistence strategies. Despite more than 5,000 years of dairy pastoralism in the region and the continued importance of dairy in the average Mongolian diet today, researchers found no evidence for the selection of lactase persistence, a genetic trait that allows lactose digestion.

"The absence of lactase persistence in Mongolian populations both today and in the past challenges current medical models of lactose intolerance, and suggests a much more complicated prehistory of dairying. We are now turning to the gut microbiome to understand how populations adapt to dairy-based diets," says Dr. Christina Warinner, senior author of the study, a professor of Anthropology at Harvard University and a research group leader at the MPI-SHH.

"Reconstructing a 6,000-year genetic history of Mongolia has had a transformative effect on our understanding of the archaeology of the region. While answering some long-standing questions, it has also generated new questions and revealed several surprises. We hope that this research will energize future work on the rich and complex relationships between ancestry, culture, technology, and politics in the rise of Asia's nomadic empires," adds Dr. Erdene Myagmar, co-senior author of the study and professor of Anthropology and Archaeology at the National University of Mongolia.

Monday, November 9, 2020

Latest Archaeology News

 

<strong>Asia</strong>

Bronze Age travel routes revealed using pioneering research method

Ancient land use on the Prehistoric Silk Road 

Archaeologists from the University of Sydney have reconstructed the ancient seasonal migration routes of Bronze Age herders in Xinjiang, north-western China. Published in the high-ranking journal *PLOS ONE*, their research was the result of innovative methodology. To determine snow cover and vegetation cycles, crucial to the survival of Bronze Age peopl...


The long and complex history of cereal cuisine in ancient China

Research reveals interplay of environment and culture have shaped modern cuisines Changing cuisines in ancient China were driven by multiple environmental and cultural practices over thousands of years, according to a study published November 4, 2020 in the ope...


Rare ancient child burial reveals 8,000-year-old secrets of the dead

Archaeologists from The Australian National University (ANU) have discovered a rare child burial dating back 8,000 years on Alor Island, Indonesia. The one-of-its-kind burial for the region is from the early mid-Holocene and gives important insights into burial practices of the time. Lead researcher Dr Sofia Samper Carro said the child, aged between four and eight, was la...


Bronze Age herders were less mobile than previously thought

Bronze Age pastoralists in what is now southern Russia apparently covered shorter distances than previously thought. It is believed that the Indo-European languages may have originated from this region, and these findings raise new questions about how technical and agricultural innovations spread to Europe. An international research team, with the participation of the University of Basel, has published a paper on this topic. During the B...


Central Asian horse riders played ball games 3,000 years ago

 Today, ball games are one of the most popular leisure activities in the world, an important form of mass entertainment and big business. But who invented balls, where and when? The oldest balls that are currently known about were made in Egypt about 4,500 years ago using linen. Central Americans have been playing ball games for at least 3,700 years, as evidenced through monumental ball courts made of stone and depictions of ball players. Their oldest balls were made of r...



<strong>Neanderthal & Denisovan - Asia</strong>


Neanderthal children grew and were weaned similar to us

Neanderthals introduced solid food in their children's diet at around 5-6 months of age GOETHE UNIVERSITY FRANKFURT FRANKFURT/KENT/BOLOGNA/FERRARA. Teeth grow and register information in form of growth lines, akin to tree rings, that can be read through histological techniques. Combining such information with chemical data obtained with a laser-mass spectrometer, in particular strontium concentrations, the scientists were able to show that these Neanderthals introduced solid food in their children's diet at around 5-6 months of age. Not cultural but physiological Alessia Nava (...


Denisovan DNA in the genome of early East Asians

Scientists identify 34,000-year-old Early East Asian of mixed Eurasian descent 

 In 2006, miners discovered a hominin skullcap with peculiar morphological features in the Salkhit Valley of the Norovlin county in eastern Mongolia. It was initially referred to as Mongolanthropus and thought to be a Neandert...


Two studies expand insights into Denisovan ancestry and population history in East Asia

In a pair of studies, researchers provide evidence that expands our understanding of modern humans in eastern Asia and their interactions with their most elusive cousins, the Denisovans. While admixture between humans and Denisovans is widely recognized, physical remains of the archaic hominin species are exceedingly rare. What's more, ancient genomic evidence from early modern humans in eastern Asia, which would capture the nature of admixture events between the two species and inform on humans' timing and movement into and across Asia, is lacking. Recently, the fragment of ...


New Denisovan DNA expands diversity, history of specie

While the continents of Africa and Europe have been obvious and fruitful treasure troves for exploration and discovery of our modern human origins, Asia has been somewhat overlooked. Scientists have thought that modern humans left Africa about 60,000 years ago and, as they colonized Western Eurasia, found a world empty of any other archaic hominin species. This assumption stemmed in part from the fact that the prehistory of Asia is poorly known compared to that of Africa and Europe. But research publish...



<strong>Near East/Egypt</strong>


Archaeologists reveal human resilience in the face of climate change in ancient Turkey

An examination of two documented periods of climate change in the greater Middle East, between approximately 4,500 and 3,000 years ago, reveals local evidence of resilience and even of a flourishing ancient society despite the changes in climate seen in the larger region. A new study led by Unive...


Modern humans took detours on their way to Europe

Favourable climatic conditions influenced the sequence of settlement movements of Homo sapiens in the Levant on their way from Africa to Europe. In a first step, modern humans settled along the coast of the Mediterranean Sea. Only then did they spread out into the Sinai desert and the eastern Jordanian Rift Valley. This is the result of archaeological research conducted by Collaborative Research Centre 'Our Way to Europe' (CRC 806) at the universities of Cologne, Bonn, and Aachen. The article 'Al-Ansab and the Dead Sea: mid-MIS 3 Archaeology and Environment of the Early ...


Inks containing lead were likely used as drier on ancient Egyptian papyri

Analysing 12 ancient Egyptian papyri fragments with X-ray microscopy, University of Copenhagen researchers were surprised to find previously unknown lead compounds in both red and black inks and suggest they were used for their drying properties rather than as a pigment. A similar lead-base..


<strong>Europe</strong>


Bison engravings in Spanish caves reveal a common art culture across ancient Europe

Recently discovered rock art from caves in Northern Spain represents an artistic cultural style common across ancient Europe, but previously unknown from the Iberian Peninsula, according to a study published October 28, 2020 in the open-access journal *PLOS ONE* by Diego Garate o...


Medieval plague outbreaks picked up speed over 300 years

McMaster University researchers who analyzed thousands of documents covering a 300-year span of plague outbreaks in London, England, have estimated that the disease spread four times faster in the 17th century than it had in the 14th century. The findings, published today in the *Proceedings of the National Academy of Sciences*, show a striking acceleration in plague transmission between the Black Death of 1348, estimated to have wiped out more than one-third of the population of Europe, and later epidemics, which culminated in the Great Plague of 1665. Researchers found that in...


<strong>Americas</strong>


Early big-game hunters of the americas were female, researchers suggest

For centuries, historians and scientists mostly agreed that when early human groups sought food, men hunted and women gathered. However, a 9,000-year-old female hunter burial in the Andes Mountains of South America reveals a different story, according to new resea...


New clues revealed about Clovis people

There is much debate surrounding the age of the Clovis -- a prehistoric culture named for stone tools found near Clovis, New Mexico in the early 1930s -- who once occupied North America during the end of the last Ice Age. New testing of bones and artifacts show th...

.

Ancient Maya built sophisticated water filters

Ancient Maya in the once-bustling city of Tikal built sophisticated water filters using natural materials they imported from miles away, according to the University of Cincinnati. UC researchers discovered evidence of a filter system at the Corriental reservoir, an important source of drinking water for the ancient Maya in what is now northern Guatemala. A multidisciplinary team of UC anthropologists, geographers and biologists identified crystalline quartz and zeolite imported miles from the city. The quartz found in the coarse sand along with zeolite, a crystalline compound co...


New evidence found of the ritual significance of a classic Maya sweat bath in Guatemala

 Sweat baths have a long history of use in Mesoamerica. Commonly used by midwives in postpartum and perinatal care in contemporary Maya communities, these structures are viewed as grandmother figures, a pattern that can also be traced to earlier periods of history. At the site of Xultun, Guatemala, a Classic Maya sweat bath with an unus...



The first human settlers on islands caused extinctions

Though some believe prehistoric humans lived in harmony with nature, a new analysis of fossils shows human arrival in the Bahamas caused some birds to be lost from the islands and other species to be completely wiped out. The researchers examined more than 7,600 fossils over a decade and concluded that human arrival in the Bahamas about 1,000 years ago was the main factor in the birds...


<strong>Africa</strong>


Major new African genome study finds varieties that inform African history, migration and immunity

The study, in which six Wits researchers were involved, show that these newly discovered variants were found mostly among newly sampled ethnolinguistic groups. Researchers identified new evidence for natural selection in and around 62 previously unreported genes associated with viral immunity, DNA repair and metabolism. They observed complex patterns of ancestral mixing within and between populations, alongside evidence that populations from Zambia was a likely intermediate site along the routes of expansion of Bantu-speaking populations. These findings improve the current unde...



Turbulent era sparked leap in human behavior, adaptability 320,000 years ago

New drill core shows a boom-bust landscape in the east African rift valley at a defining moment in human evolution, technology and culture For hundreds of thousands of years, early humans in the East African Rift Valley could expect certain things of their environment. Freshwater lakes in the region ensured a reliable source of water, and large grazing herbivores roamed the grasslands. Then, around 400,000 years ago, things changed. The environment became less predictable, and human ancestors faced new sources of instability and uncertainty that challenged their previous long-s...


Climate change likely drove early human species to extinction

Of the six or more different species of early humans, all belonging to the genus Homo, only we Homo sapiens have managed to survive. Now, a study reported in the journal *One Earth*on October 15 combining climate modeling and the fossil record in search of clues to what led to all those earlier extinctions of our ancient ancestors suggests that climate change--the inability to adapt to either warming or cooling temperatures--likely played a major role in sealing their fate. "Our findings show that despite technological innovations including the use of fire and refined stone tools...



<strong>

Israel</strong>


Stone Weight Used in Commerce During First Temple Period Discovered Near Western Wall in Jerusalem


A limestone weight that dates to the First Temple era and may have been used in marketplace commerce or for the acquirement of animals to sacrifice was recently discovered in Jerusalem during a soil sift from an excavation near the Western Wall. The weight, inscribed with a symbol representing the word “shekel,” was found while archaeologists wet-sifted soil from a landfill area as part of a joint project between the Israel Antiquities Authority and the Western Wall Heritage Foundation. “The weight is dome-shaped with a flat base. On the top of the weight is an incis...


Tradition of petrified birds in the Dome of the Rock

 On the southern exterior wall of the Dome of the Rock, a very important Islamic shrine in Jerusalem's Old City, there are two marble slabs, both carved from the same stone and placed side by side to form a symmetrical pattern, that depicts two birds. In a recent article published in the *Journal of Near Eastern Studies*, "Solomon and The Petrified Birds on the Dome of the Rock," ...


Byzantine—Early Islamic resource management detected through micro-geoarchaeological investigations of trash mounds (Negev, Israel)

Sustainable resource management is of central importance among agrarian societies in marginal drylands. In the Negev Desert, Israel, research on agropastoral resource management during Late Antiquity emphasizes intramural settlement contexts and landscape features. The importance of hinterland trash deposits as diachronic archives of resource use and disposal has been overlooked until recently. Without these data, assessments of community-scale responses to societal, economic, and environmental disruption and reconfiguration remain incomplete. In this study, micro-geoarchaeologi...


An astonishing common denominator among storage jars in Israel over a period of 350 years: the inner-rim diameter of the jar's neck.

Israeli archaeologists found an astonishing common denominator among storage jars in Israel over a period of 350 years: the inner-rim diameter of the jar's neck. It's consistent with measurements of the palm of a (male) hand and may reflect the use of the original metrics for the biblical measurement of the "tefach," a unit of measurement that was used primarily by ancient Israelites, appears frequently in the Old Testament and is the basis for many legal and purity laws...



















Thursday, November 5, 2020

Bronze Age travel routes revealed using pioneering research method


Ancient land use on the Prehistoric Silk Road

UNIVERSITY OF SYDNEY

Research News

IMAGE

IMAGE: KAZAKH HERDERS IN NORTH-WESTERN XINJIANG MIGRATING TO THEIR WINTER CAMPview more 

CREDIT: PETER JIA



Archaeologists from the University of Sydney have reconstructed the ancient seasonal migration routes of Bronze Age herders in Xinjiang, north-western China.

Published in the high-ranking journal PLOS ONE, their research was the result of innovative methodology. To determine snow cover and vegetation cycles, crucial to the survival of Bronze Age people and their flocks, they examined both satellite imagery and archaeological evidence, as well as interviewing modern-day herders.

In conjunction with researchers from the Institute of Archaeology, Chinese Academy of Social Sciences, Beijing, they then used these data to create a model of how the landscape was used more than 3,500 years ago.

"This detailed model of how Bronze Age people capitalised on the resources in their environment helps greatly in understanding the Prehistoric Silk Road," said lead author Dr Peter Jia.

"For example, our ethnographic studies - interviews with local herders - have explained why certain locations were and still are chosen throughout the seasons: for the presence of early and late grass, optimal grazing potential in summer, and the absence of snow cover in the winter.

"Analysis of satellite imagery, together with the results of archaeological surveys and excavations, has enabled us to test these anecdotal accounts and prove their accuracy."

Study co-author, Professor Alison Betts added: "From previous archaeological evidence, it was difficult to determine how Bronze Age pastoralists adapted to life in Xinjiang and used the landscape that they settled in.

"Now we have a new validated method for determining the season in which people stayed in a place."

Dangers on the Steppe: why seasonal migration matters

The Eurasian steppe/mountain zone is a harsh environment. The main adaption to this arid landscape happened in the Bronze Age with the introduction of domesticated animals. But still today, it remains a place with inherent dangers to the livelihoods of people. Too much snow in winter and the animals cannot find enough food, dying by the hundreds in what locals call a 'white disaster'. Too little snow and there is not enough water for humans and animals, the feared 'black disaster'. Managing the landscape through seasonal migration is key to survival and maintenance of the economic system based on livestock.

Pioneering methodology

The strength of the study lies in its interdisciplinary approach, combining cutting-edge satellite technology with ethnographic and archaeological fieldwork.

Establishing growth cycles for vegetation of grazing lands and estimating the snow depth using satellite imagery allowed the researchers to assess the suitability of different parts of the mountains for herding in different seasons. Comparing these data with the accounts of local Mongolian and Kazakh pastoralists, they found them to be closely matching.

"Archaeology is one of the few fields that provides insights into how humans have interacted with the environment in the past," said co-author, Dr Gino Caspari.

"With exacerbating environmental conditions worldwide, it is crucial to analyse this history.

"This task requires us to connect academic disciplines and cooperate internationally. Our study is a good example of this."

The long and complex history of cereal cuisine in ancient China


Research reveals interplay of environment and culture have shaped modern cuisines

Changing cuisines in ancient China were driven by multiple environmental and cultural practices over thousands of years, according to a study published November 4, 2020 in the open-access journal PLOS ONEby Xinyi Liu of Washington University in St. Louis and Rachel E. B. Reid of Virginia Polytechnic Institute and State University in Virginia.

Cereal grains - including wheat, rice, barley, millet and more - are the most important food sources in the world today. But understanding how these foods originated and spread across the world requires a global effort. In this study, Liu and Reid focus on the ancient history of staple cereals across China, a country well-known for its diverse food products and early adoption of many domesticated plants.

The authors compiled published data of stable carbon and nitrogen isotope compositions measured from 2,448 human skeletal samples from 128 archaeological sites across China, covering a time span over 6,000 years. These isotopic data are indicators of what kinds of plants these humans were predominantly eating, allowing the authors to infer cuisine patterns across time and space. They found that prior to 2000 BC, Chinese staple cuisines were strongly differentiated between northern and southern cultures, while cultures younger than that were dominated by east-west differences.

The authors infer that these patterns of changing cuisines are not driven by traditional narrative of "stages" of changing subsistence modes (hunting, foraging, pastoralism, farming), but are instead driven by multiple factors that favored various hybridized subsistence modes at different times and spaces. They argue that the early north-south divide was driven by environmental differences that favored different plant resources in wetland vs. arid regions, while the later east-west division was driven by differences in cultural practice, with eastern cooking habits of boiling and steaming less suited to adopting new cereals like wheat and barley.

Liu adds: "It appears that cooking is an important force shaping the ancient world. In the context of prehistoric 'food globalisation', the reaction of the local cooking tradition to novel exotic food ingredients is a key driver of their adoption and translocation, sustaining the economic foundation of the ancient world...

The dispersal of crops into new areas was not necessarily accompanied by the spread of the intrinsic cooking technology. Sometimes novel grains could be incorporated into the local cuisines. We can always relate this to our own experience of food and cooking. Southern style homemade baked beans with bacon are folded into English breakfast tradition to be served on toast."

Early big-game hunters of the americas were female, researchers suggest


Challenges age-old 'man-the-hunter' hypothesis

UNIVERSITY OF CALIFORNIA - DAVIS

Research News

IMAGE

IMAGE: ILLUSTRATION OF FEMALE HUNTER DEPICTING HUNTERS WHO MAY HAVE APPEARED IN THE ANDES 9,000 YEARS AGO. view more 

CREDIT: MATTHEW VERDOLIVO, UC DAVIS IET ACADEMIC TECHNOLOGY SERVICES

For centuries, historians and scientists mostly agreed that when early human groups sought food, men hunted and women gathered. However, a 9,000-year-old female hunter burial in the Andes Mountains of South America reveals a different story, according to new research conducted at the University of California, Davis.

"An archaeological discovery and analysis of early burial practices overturns the long-held 'man-the-hunter' hypothesis," said Randy Haas, assistant professor of anthropology and the lead author of the study, "Female Hunters of the Early Americas." It was published today (Nov. 4) in Science Advances.

"We believe that these findings are particularly timely in light of contemporary conversations surrounding gendered labor practices and inequality," he added. "Labor practices among recent hunter-gatherer societies are highly gendered, which might lead some to believe that sexist inequalities in things like pay or rank are somehow 'natural.' But it's now clear that sexual division of labor was fundamentally different -- likely more equitable -- in our species' deep hunter-gatherer past."

In 2018, during archaeological excavations at a high-altitude site called Wilamaya Patjxa in what is now Peru, researchers found an early burial that contained a hunting toolkit with projectile points and animal-processing tools. The objects accompanying people in death tend to be those that accompanied them in life, researchers said. It was determined that the hunter was likely female based on findings by the team's osteologist, James Watson of The University of Arizona. Watson's sex estimate was later confirmed by dental protein analysis conducted by UC Davis postdoctoral researcher Tammy Buonasera and Glendon Parker, an adjunct associate professor.

Revealing a broader pattern

The surprising discovery of an early female hunter burial led the team to ask whether she was part of a broader pattern of female hunters or merely a one-off. Looking at published records of late Pleistocene and early Holocene burials throughout North and South America, the researchers identified 429 individuals from 107 sites. Of those, 27 individuals were associated with big-game hunting tools -- 11 were female and 15 were male. The sample was sufficient to "warrant the conclusion that female participation in early big-game hunting was likely nontrivial," researchers said. Moreover, the analysis identified the Wilamaya Patjxa female hunter as the earliest hunter burial in the Americas.

Statistical analysis shows that somewhere between 30 to 50 percent of hunters in these populations were female, the study said. This level of participation stands in stark contrast to recent hunter-gatherers, and even farming and capitalist societies, where hunting is a decidedly male activity with low levels of female participation, certainly under 30 percent, Haas explained.

The study was conducted in collaboration with multiple UC Davis labs. Parker, a forensic expert in the Department of Environmental Toxicology, helped determine sex through a proteomic technique he recently developed. In Professor Jelmer Eerkens' lab, Jenny Chen, an undergraduate researcher at the time of the study, discovered the distinct isotopic signature of meat consumption in the bones, further supporting the conclusion that the Wilamaya Patjxa female was a hunter.

While the research answers an old question about sexual division of labor in human societies, it also raises some new ones. The team now wishes to understand how sexual division of labor and its consequences in different times and places changed among hunter-gatherer populations in the Americas.

Rare ancient child burial reveals 8,000-year-old secrets of the dead


AUSTRALIAN NATIONAL UNIVERSITY

Research News

IMAGE

IMAGE: ENTRANCE TO MAKPAN CAVE, ALOR ISLAND, WHERE THE BURIAL WAS DISCOVEREDview more 

CREDIT: IMAGE: DR SHIMONA KEALY, ANU

Archaeologists from The Australian National University (ANU) have discovered a rare child burial dating back 8,000 years on Alor Island, Indonesia.

The one-of-its-kind burial for the region is from the early mid-Holocene and gives important insights into burial practices of the time.

Lead researcher Dr Sofia Samper Carro said the child, aged between four and eight, was laid to rest with some kind of ceremony.

"Ochre pigment was applied to the cheeks and forehead and an ochre-coloured cobble stone was placed under the child's head when they were buried," she said.

"Child burials are very rare and this complete burial is the only one from this time period," Dr Samper Carro said.

"From 3,000 years ago to modern times, we start seeing more child burials and these are very well studied. But, with nothing from the early Holocene period, we just don't know how people of this era treated their dead children. This find will change that."

Notably, the child's arm and leg bones were removed before interment and disposed of elsewhere.

"The lack of long bones is a practice that has been documented in several other burials from a similar time period in Java, Borneo and Flores, but this is the first time we have seen it in a child's burial," Dr Samper Carro said.

"We don't know why long bone removal was practised, but it's likely some aspect of the belief system of the people who lived at this time."

The estimated age of the child based on teeth correspond to a six- to eight-year-old child, but the skeleton is that of a four- to five-year-old child.

"We want to do some further paleo-health research to find out if this smaller skeleton is related to diet or the environment or possibly to being genetically isolated on an island," Dr Samper Carro said.

"My earlier work from Alor showed adult skulls were also small. These hunter-gatherers had a mainly marine diet and there is evidence to suggest protein saturation from a single food source can cause symptoms of mal-nourishment, which affects growth. However, they could have been eating other terrestrial resources such as tubers.

"By comparing other adult burials we have found from the same time period with this child burial in a future project, we hope to build a chronology and general view of burial practices in this region from between 12,000 to 7,000 years ago which at the moment is still scant."

###

Monday, November 2, 2020

Neanderthal children grew and were weaned similar to us


Neanderthals introduced solid food in their children's diet at around 5-6 months of age

GOETHE UNIVERSITY FRANKFURT

FRANKFURT/KENT/BOLOGNA/FERRARA. Teeth grow and register information in form of growth lines, akin to tree rings, that can be read through histological techniques. Combining such information with chemical data obtained with a laser-mass spectrometer, in particular strontium concentrations, the scientists were able to show that these Neanderthals introduced solid food in their children's diet at around 5-6 months of age.

Not cultural but physiological

Alessia Nava (University of Kent, UK), co-first author of the work, says: "The beginning of weaning relates to physiology rather than to cultural factors. In modern humans, in fact, the first introduction of solid food occurs at around 6 months of age when the child needs a more energetic food supply, and it is shared by very different cultures and societies. Now, we know that also Neanderthals started to wean their children when modern humans do".

"In particular, compared to other primates" says Federico Lugli (University of Bologna), co-first author of the work "it is highly conceivable that the high energy demand of the growing human brain triggers the early introduction of solid foods in child diet".

Neanderthals are our closest cousins within the human evolutionary tree. However, their pace of growth and early life metabolic constraints are still highly debated within the scientific literature.

Stefano Benazzi (University of Bologna), co-senior author, says: "This work's results imply similar energy demands during early infancy and a close pace of growth between Homo sapiens and Neanderthals. Taken together, these factors possibly suggest that Neanderthal newborns were of similar weight to modern human neonates, pointing to a likely similar gestational history and early-life ontogeny, and potentially shorter inter-birth interval".

Home, sweet home

Other than their early diet and growth, scientists also collected data on the regional mobility of these Neanderthals using time-resolved strontium isotope analyses.

"They were less mobile than previously suggested by other scholars" says Wolfgang Müller (Goethe University Frankfurt), co-senior author "the strontium isotope signature registered in their teeth indicates in fact that they have spent most of the time close to their home: this reflects a very modern mental template and a likely thoughtful use of local resources".

"Despite the general cooling during the period of interest, Northeastern Italy has almost always been a place rich in food, ecological variability and caves, ultimately explaining survival of Neanderthals in this region till about 45,000 years ago" says Marco Peresani (University of Ferrara), co-senior author and responsible for findings from archaeological excavations at sites of De Nadale and Fumane.

This research adds a new piece in the puzzling pictures of Neanderthal, a human species so close to us but still so enigmatic. Specifically, researchers exclude that the Neanderthal small population size, derived in earlier genetic analyses, was driven by differences in weaning age, and that other biocultural factors led to their demise. This will be further investigated within the framework of the ERC project SUCCESS ('The Earliest Migration of Homo sapiens in Southern Europe - Understanding the biocultural processes that define our uniqueness'), led by Stefano Benazzi at University of Bologna.