Migration Patterns Reveal an Eden for Ancient Humans and Animals
Pinnacle Point, a series of archaeological sites that overlook a now submerged section of South Africa’s coastline and one of the world’s most important localities for the study of modern human origins, was as much of an Eden for animals as it was for early humans. Jamie Hodgkins, PhD, assistant professor of anthropology at University of Colorado Denver, and her team drilled ancient herbivore teeth to find that many local animals stayed put in the ecologically rich ecosystem, which may explain why humans flourished there, too.
Their study was published in a Quaternary Science Reviews special issue: The Palaeo-Agulhas Plain: a lost world and extinct ecosystem this month.
Credit: University of Colorado Denver
In this study, the researchers looked specifically at antelope migratory patterns at Pinnacle Point. This series of cave sites that sit on the modern South African coast offers archaeological materials from humans who were living and hunting there back to 170,000 years ago.
“During glacial cycles, the coastal shelf was exposed,” said Hodgkins. “There would have been a huge amount of land in front of the cave sites. We thought it was likely that humans and carnivores were hunting animals as they migrated east and west over the exposed shelve.”
A Lack of Migratory Pattern
Hodgkins and her team wanted to understand those migratory patterns. They studied the carbon and oxygen isotopes within the tooth enamel of many large herbivores, including Redunca, or reedbuck, a nonmigratory antelope. Tooth enamel can reveal a pattern of migration by tracking changing levels of carbon from the plants an animal eats as its teeth grow.
In general, wetter, cooler environments are home to C3 plants; hotter, drier environments are home to C4 plants. Animals like lush vegetation, which means they tend to follow the rain patterns: in this case east for summer rain (C4 grasses), and west for winter rain (C3 grasses). If animals were migrating between summer and winter rainfall zones, their tooth enamel would register that annual C3 and C4 plant rotation as a sinusoidal curve as their teeth grew.
“They weren’t struggling at Pinnacle Point,” says Hodgkins. “We now know that powerful river systems supplied the expanded coast, thus animals didn’t have to be migratory. It was a great location, resource-wise. During interglacials when the coast moved closer to the caves humans had shellfish and other marine resources, and when the coast expanded in glacial times hunters had access to a rich, terrestrial environment. Hunters wouldn’t need to be as mobile with all of these herbivores wandering around.”
Hodgkins’ team’s findings of this prehistoric Eden echoed another recent discovery. Seventy-four-thousand years ago, one of Earth’s largest known eruptions at Mount Toba in Sumatra, Indonesia, created a global winter, causing population crashes. In 2018, researchers from Marean’s group found that humans at Pinnacle Point not only survived, but thrived in the haven.
Credit: University of Colorado Denver
Hodgkins says this is just a first attempt at using isotopic data to test the hypothesis of east and west migration patterns at these sites and further research will be done.
“It is quite possible that animal migration patterns changed as the coastline moved in and out during glacial and interglacial cycles,” said Hodgkins.
Funders for this project include the National Science Foundation, the Hyde Family Foundations, and the John Templeton Foundation at the Institute of Human Origins (IHO) at Arizona State University.
Contacts and sources:
Sarah Erickson, By Rachel Sturtz
University of Colorado Denver
Publication:
An isotopic test of the seasonal migration hypothesis for large grazing ungulates inhabiting the Palaeo-Agulhas Plain. Quaternary Science Reviews Volume 235, 1 May 2020, 106221 https://www.sciencedirect.com/science/article/abs/pii/S0277379119309047?via%3Dihub
Source: http://www.ineffableisland.com/2020/05/migration-patterns-reveal-eden-for.html
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