The Sakhallo-Arabian desert is one of the largest biogeographical barriers on Earth, hindering the dispersion between Africa and Eurasia, including human movements in the past. Recent research suggests that this barrier has been in place for at least 11 million years. However, a new Griffith University-led study shows that numerous humidity intervals have occurred in the Sakhallo-Arabian desert over the past 8 million years.
Marcouska et al. It shows wet intervals that have recurred inside Central Arabia over the past 8 million years. Image credit: Paul Breeze.
Arabia is at the heart of the largest near-continuous chain of arid lands on the planet. A harsh and often highly dry belt that stretches from the Sahara to the Tar Desert.
Sakhallo-Arabian desert barriers limit animal dispersion and divide Africa and Eurasia into areas of Afrotropic, palate, and Indomalaya biogeography, each characterized by a distinct assemblage of plants, animal species and communities.
While the persistence of this desert barrier serves as a major control over the depiction of these biogeographical regions, improvements in climate throughout the Sakhallo-Arabian region allow for dispersion among them.
As a result, the region is a “transition zone” and hosts a complex fauna mixture with characteristics of Africa, Eurasia and South Asia.
Recent research suggests that a dry beyond this desert barrier and that it has begun to be highly aridity and highly dry on the edge of northern Arabia 9 million years ago in the completely arid state of the Sahara at least 11 million years ago.
“However, fossil evidence from the late Miocene (marked by rising earth temperatures) and the Pleistocene (including multiple ice ages) suggests the existence of an episode within the interior of the water-dependent animal Sakhallo-Arabian desert.”
“It is possible that animals such as crocodiles, quids, cobopotamids, and absoscideans were supported by rivers and lakes that are almost nonexistent from today’s arid landscape.”
“These wet conditions could promote the dispersion of these mammals between Africa and Eurasia, and Arabia serves as an important crossroads in continental-scale biogeographic exchange.”
In the new study, Professor Petraglia and colleagues analyzed a set of osteoscopic electrons (mineral deposits such as bulls and stellates) from a series of caves from within Arabia.
It is one of the longest aleoclimatic records available in Arabia today, and represents one of the longest space paleoclimatic records in the world.
“Little was known about Arabian paleoclimate before this time,” said Dr. Monica Markowska of Northumbria University.
“The findings highlight that the effects of monsoons have been weakened and polar ice coverings in the Pleistocene during the Pleistocene have been strengthened, reducing precipitation during humidity intervals and changing over time.”
“Although Arabia has traditionally been overlooked in the dispersion of Africa and Yolasia, research like ours is increasingly revealing the central location of mammal and human migration,” added Dr Faisal Al-Jiblin, who led Saudi archaeologists on the Heritage Committee.
result It will be displayed in the journal Nature.
____
M. Markouska et al. The recurrence of humidity in Arabia over the past 8 million years. NaturePublished online on April 9, 2025. doi:10.1038/s41586-025-08859-6
Source: www.sci.news
