International
Oldest human relative walked upright 7 mn years ago: study
AFP
The earliest known human ancestor walked on two feet as well as climbing through trees around seven million years ago, scientists said Wednesday after studying three limb bones.
When the skull of Sahelanthropus tchadensis was discovered in Chad in 2001, it pushed back the age of the oldest known representative species of humanity by a million years.
Nicknamed “Toumai”, the nearly complete cranium was thought to indicate that the species walked on two feet because of the position of its vertebral column and other factors.
However the subject triggered fierce debate among scientists, partly due to the scarcity and quality of the available bones, with some even claiming that Toumai was not a human relative but just an ancient ape.
In a study published in the Nature journal on Wednesday, a team of researchers exhaustively analysed a thigh bone and two forearm bones found at the same site as the Toumai skull.
“The skull tells us that Sahelanthropus is part of the human lineage,” said paleoanthropologist Franck Guy, one of the authors of the study.
The new research on the limb bones demonstrates that walking on two feet was its “preferred mode of getting around, depending on the situation,” he told a press conference.
But they also sometimes moved through the trees, he added.
– ‘Not a magical trait’ –
The leg and arm bones were found alongside thousands of other fossils in 2001, and the researchers were not able to confirm that they belonged to the same individual as the Toumai skull.
After years of testing and measuring the bones, they identified 23 characteristics which were then compared to fossils from great apes as well as hominins — which are species more closely related to humans than chimpanzees.
They concluded that “these characteristics are much closer to what would be seen in a hominin than any other primate,” the study’s lead author Guillaume Daver told the press conference.
For example, the forearm bones did not show evidence that the Sahelanthropus leaned on the back of its hands, as is done by gorillas and chimpanzees.
The Sahelanthropus lived in an area with a combination of forests, palm groves and tropical savannahs, meaning that being able to both walk and climb through trees would have been an advantage.
There have been previous suggestions that it was the ability to walk on two feet that drove humans to evolve separately from chimpanzees, putting us on the path to where we are today.
However the researchers emphasised that what made Sahelanthropus human was its ability to adapt to its environment.
“Bipedalism (walking on two legs) is not a magical trait that strictly defines humanity,” paleontologist Jean-Renaud Boisserie told the press conference.
“It is a characteristic that we find at the present time in all the representatives of humanity.”
– Our ‘bushy’ family tree –
Paleoanthropologist Antoine Balzeau of France’s National Museum of Natural History said the “extremely substantial” study gives “a more complete image of Toumai and therefore of the first humans”.
It also bolstered the theory that the human family tree is “bushy”, and was not like the “simplistic image of humans who follow one another, with abilities that improve over time,” Balzeau, who was not involved in the research, told AFP.
Daniel Lieberman, a professor of human evolutionary biology at Harvard University, said in a linked paper in Nature that the study’s “authors have squeezed as much information as possible from the fossil data”.
But he added that the research will not offer “full resolution” of the debate.
Milford Wolpoff, a paleoanthropologist at the US University of Michigan cast doubt on whether Toumai is a hominin, telling AFP that “extraordinary claims require extraordinary evidence”.
Wednesday’s study was carried out by researchers from the PALEVOPRIM paleontology institute, a collaboration between France’s CNRS research centre and Poitiers University, as well as scientists in Chad.
Guy said the team hopes to continue its research in Chad next year — “security permitting”.
Chadian paleontologist Clarisse Nekoulnang said the team was “trying to find sites older than that of Toumai”.
International
Mexican government prioritizes 191 communities after deadly floods
Mexican President Claudia Sheinbaum confirmed on Wednesday that the death toll from recent rains and floods across several central states has risen to 66, while the federal government has activated air bridges and prioritized assistance in 191 isolated communities.
“Unfortunately, 66 people have died, and 75 remain missing,” the president said during her morning press conference. She added that the official death toll will be updated later in a new report.
As of Tuesday, authorities had reported 64 fatalities. Sheinbaum also announced the creation of a public information center to centralize official data on the deceased, missing persons, damaged homes, and cut-off communities.
According to the president, the number of missing persons has decreased thanks to coordination with state authorities.
“Through calls to phone line 079, 103 people who had been reported missing have now been located,” she explained.
Priority Municipalities
The president noted that the federal government has classified 191 communities as ‘priority’, a designation based mainly on the percentage of homes affected.
International
New road and bridge explosions raise alarm amid indigenous protests in Ecuador
Ecuadorian authorities are investigating two explosions that occurred early Wednesday, one on a road in the southern part of the country and another under a bridge in Guayas province. These incidents follow the car bomb explosion in the coastal city of Guayaquil, also in Guayas, which occurred the day before and left one person dead and 30 injured.
Press reports indicate that one person was injured and several vehicles were damaged in the explosion on the Cuenca-Girón-Pasaje road in the south.
“Besides yesterday’s explosion in Guayaquil, we have received reports of explosives placed on bridges along the Guayaquil-Machala and Machala-Cuenca routes to disrupt traffic,” said Roberto Luque, Minister of Infrastructure and Transport (MIT).
On his X social media account, Luque reported that authorities have been deployed to the sites to assess the damage and determine the current condition of the structures.
“What they haven’t achieved with their call for a strike, some are trying to achieve through terrorism,” he stated, referring to the 24 days of protests organized by the Confederation of Indigenous Nationalities (Conaie) against rising diesel prices and other demands.
The protests, called at a national level, have Imbabura province as their epicenter. Roadblocks have also been reported in the northern part of Pichincha province, whose capital is Quito, while activities in the rest of the country continue normally.
International
Armed forces target illegal mines in Northern Ecuador with bombing raids
Ecuador’s Armed Forces carried out an operation on Monday — including airstrikes — against illegal mining in the town of Buenos Aires, in the country’s north, Defense Minister Gian Carlo Loffredo reported.
The mountainous, gold-rich area has been a hotspot for illegal mining since 2017, located in the Andean province of Imbabura.
In 2019, former president Lenín Moreno deployed around 2,400 soldiers to the region in an attempt to curb the illegal activity. “The operation began with mortar fire, followed by gunfire and bombing runs by Supertucano aircraft,” Loffredo said in a video released by the Defense Ministry.
He added that the operation would continue on Tuesday with patrols across the area to locate possible members of “irregular armed groups that may have crossed from the Colombian border.”
The Armed Forces stated on X that the intervention focused on the “complete elimination of multiple illegal mining tunnels” in the areas known as Mina Nueva and Mina Vieja.
The operation coincided with the deployment of a military and police convoy into Imbabura, which has been the epicenter of protests against President Daniel Noboa since September 22, following his decision to scrap the diesel subsidy.
Mexican government prioritizes 191 communities after deadly floods
New road and bridge explosions raise alarm amid indigenous protests in Ecuador
Armed forces target illegal mines in Northern Ecuador with bombing raids
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