Early humans had already developed the skills and tools to survive climate change, study finds
Early humans living two million years ago already had the skills and tools they needed in order to cope with the effects of climate change, study shows.
Archaeologists from the Max Planck Institute studied changes to the environment and habitats of early hominins at the Oldupai Gorge heritage site in Tanzania.
Also known as the ‘Cradle of Humankind’, new field work at the site revealed our ancestors remained stable despite environment changes over 200,000 years.
These early humans stayed in a habitat continuously throughout – despite having to cope with global warming, wildfires, droughts and volcanic eruptions.
It shows migrations ‘out of Africa’ were possible even during the early human periods – as our ancestors possessed the ability to expand into new ecosystems.
Olduvai (now Oldupai) Gorge, known as the Cradle of Humankind, is a UNESCO World Heritage site in Tanzania. Early human used a wide diversity of habitats amidst environmental changes across a 200,000 year-long period
Co-author Professor Michael Petraglia, of the Max Planck Institute for the Science of Human History, in Germany, said it is evidence of a behavioural flexibility.
He said this started in the context of the dawn of the evolution of the hominins – and helped ‘set the stage for the eventual global, invasive spread of Homo sapiens.’
Excavations at Tanzania’s Oldupai Gorge, previously known as the Olduvai Gorge, uncovered the presence of hominins – our most primitive ancestors – that lived between two and one point eight million years ago.
The oldest form of stone tools, known as Oldowan, were also unearthed, along with a wide variety of mammal fossils including wild cattle, pigs, hippos, panthers, lions, hyena, primates, reptiles and birds – all had been butchered for food.
The crude Oldowan implements were used to smash open the bones and extract the nutritious marrow from the butchered animals, experts discovered.
Remains of one of the first hominins were found just 350 metres away from this site in deposits dating back 1.82 million years.
Known as Homo habilis, the four foot tall species had a short body, long arms like an ape’s – and a big brain. Its name translates as ‘handy man’ after his tool skills.
Despite having to cope with persistent weather catastrophes, the area remained occupied by early humans – proving they could adapt to climate change.
It turned from lakeside palm groves, idyllic meadows littered with ferns and mosaics of woodland to landscapes burned by natural disasters and dry steppes.
The evidence shows periodic but recurrent land use across a subset of environments – punctuated with times when there is an absence of activity.
The Oldubai Gorge, previously known as Oldavai Gorge, in northern Tanzania has produced some of the oldest remains of early human ancestors known to date
Co-author Dr Pastory Bushozi, of Dar es Salaam University, Tanzania, said: ‘The occupation of varied and unstable environments – including after volcanic activity – is one of the earliest examples of adaptation to major ecological transformations.’
The Unesco World Heritage Oldupai Gorge site is located in the Great Rift Valley, between the Ngorongoro Crater and the Serengeti National Park.
It was formed about 30,000 years ago, the result of aggressive geological activity and streams. The steep ravine is about 30 miles long and 300 feet deep.
The location boasts extraordinary records of extinct human species spanning several million years and for more than a century experts have been exploring outcrops.
The latest study published in Nature Communications sheds light on the environmental contexts in which these hominins lived for the first time.
Excavation at Ewass Oldupa uncovered the oldest Oldowan stone tools ever found at Oldupai Gorge, dating to ~2 million years ago and fossils of mammals, reptiles and birds
Hominin occupation of fluctuating and disturbed habitats is unique in the prehistoric records. It shows complex behavioural adaptations among these early humans.
In the face of new challenges they did not substantially alter their toolkits – but instead their technology remained stable over time.
Indicative of their versatility, typical Oldowan stone tools hewn from pebbles and cobbles and sharp-edged flakes continued to be used even as conditions changed.
It shows they had the capacity to continually exploit a multitude of habitats using reliable tools to process plants and cut up animals – over the long term.
Other hominins such as Australopithecines – the species to which the famous early human ancestor ‘Lucy’ belongs – may also have been making stone tools there.
The findings have been published in the journal Nature Communications.
