Model suggests that a shift in weather patterns in southern Africa might have contributed to the rise of Homo sapiens.
across the globe was possible because a more elliptical orbit created wetter climate conditions that allowed the species to migrate more widely. The simulation also showed that the most habitable regions, in terms of climate, shifted over time, and the fossil record tracked along with them.“The global collection of skulls and tools is not randomly distributed in time,” Timmermann says. “It follows a pattern” that overlaps with climate change driven by Earth’s movement.
One part of this pattern might provide fresh insight into where and how our own species emerged. Some genetic studies of modern-day hunter-gather groups in sub-Saharan Africa — who tend to be genetically isolated — suggest thatis the outcome of a single evolutionary event in southern Africa. But other studies point to a more complex story, in which humanity began as a hotchpotch of many different groups of ancient Africans that, together, evolved into modern-day humans.
Timmermann and his colleagues say that their climate reconstruction favours the single-evolutionary-path hypothesis. The model suggests that our species evolved whenin southern Africa started losing liveable habitat during an unusually warm period. This population could have evolved intoBut this finding is unlikely to end debate.
Which is why Timmermann and his colleagues are planning to run even larger models, including ones that integrate genetic data.
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