To determine the likelihood of humans reaching the Ryukyu Islands via accidental drift with the Kuroshio Current, Yousuke Kaifu and colleagues studied the trajectories of 138 satellite-tracked buoys, which drifted past Taiwan or northeastern Luzon between 1989 and 2017. Of the 122 buoys that drifted past Taiwan 114 were carried northward by the Kuroshio and, of these, 3 came within 20 kilometers of the central and south Ryukyu Islands under adverse weather conditions. Of the 16 buoys that drifted past Luzon, 13 drifted with the Kuroshio but only one moved towards the Ryukyu Islands due to a typhoon. As the flow of the Kuroshio Current is thought to have remained unchanged during the past 100,000 years, the results indicate that humans in drifting boats were unlikely to reach the islands via accidental drift with the Kuroshio Current. The findings suggest that humans deliberately crossed one of the world’s strongest currents in order to migrate to the Ryukyu Islands approximately 35,000 years ago.
Human migration over the last 50,000 years is an essential part of human history. One aspect of this story that fascinates many is the ways in which ancient people must have crossed between separate land masses. Professor Yosuke Kaifu from the University Museum at the University of Tokyo and his team explore this subject, in particular a crossing known to have taken place 35,000-30,000 years ago from Taiwan to the Ryukyu Islands, including Okinawa, in southwestern Japan.
“There have been many studies on Paleolithic migrations to Australia and its neighboring landmasses, often discussing whether these journeys were accidental or intentional,” said Kaifu. “Our study looks specifically at the migration to the Ryukyu Islands, because it is not just historically significant, but is also very difficult to get there. The destination can be seen from the top of a coastal mountain in Taiwan, but not from the coast. In addition, it is on the opposite side of the Kuroshio, one of the strongest currents in the world. If they crossed this sea deliberately, it must have been a bold act of exploration.”
This issue of the intentionality of this journey is less straightforward to solve than you might imagine. To investigate the likelihood of the journey occurring by chance, the effect of the Kuroshio on drifting craft needed measuring. To do this, Kaifu and his team used 138 satellite-tracked buoys to trace the path of a would-be drifter caught on this journey.
“The results were clearer than I would have expected,” said Kaifu. “Only four of the buoys came within 20 kilometers of any of the Ryukyu Islands, and all of these were due to adverse weather conditions. If you were an ancient mariner, it’s very unlikely you would have set out on any kind of journey with such a storm on the horizon. What this tells us is that the Kuroshio directs drifters away from, rather than towards, the Ryukyu Islands; in other words, that region must have been actively navigated.”
You might wonder how we can be so sure the current itself is the same now as it was over 30,000 years ago. But existing evidence, including geological records, tell researchers that currents in the region have been stable for at least the last 100,000 years. As for the researchers’ confidence that Paleolithic voyagers would not dare face stormy conditions that might otherwise explain chance migrations, prior research suggests that these voyagers were groups including families, whose modern-day analogues do not take such risks.
“At the beginning, I had no idea how to demonstrate the intentionality of the sea crossings, but I was lucky enough to meet my co-authors in Taiwan, leading authorities of the Kuroshio, and came across the idea of using the tracking buoys,” said Kaifu. “Now, our results suggest the drift hypothesis for Paleolithic migration in this region is almost impossible. I believe we succeeded in making a strong argument that the ancient populations in question were not passengers of chance, but explorers.”
Kaifu, Y., Kuo, T.-H., Kubota, Y., Jan, S. Palaeolithic voyage for invisible islands beyond the horizon. Scientific Reports. DOI: 10.1038/s41598-020-76831-7