Competition between species played a major role in the rise and fall of hominins – and produced a “bizarre” evolutionary pattern for the Homo lineage – according to a new University of Cambridge study that revises the start and end dates for many of our early ancestors.

Conventionally, climate is held responsible for the emergence and extinction of hominin species. In most vertebrates, however, interspecies competition is known to play an important role.

Now, research shows for the first time that competition was fundamental to “speciation” – the rate at which new species emerge – across five million years of hominin evolution.

A Unique Evolutionary Path for Humans

The study, published in Nature Ecology & Evolution, also suggests that the species formation pattern of our own lineage was unlike almost anything else.

“We have been ignoring the way competition between species has shaped our own evolutionary tree,” said lead author Dr Laura van Holstein, a University of Cambridge biological anthropologist from Clare College. “The effect of climate on hominin species is only part of the story.”

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In other vertebrates, species form to fill ecological “niches” says van Holstein. Take Darwin‘s finches: some evolved large beaks for nut-cracking, while others evolved small beaks for feeding on certain insects. When each resource niche gets filled, competition kicks in, so no new finches emerge and extinctions take over.

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