Submitted edit of Aquatic Ape Hypothesis page on Wikipedia

Allan Krill
Edited 7/24/21

Bioko island postulated to be the aquatic location

Bizarre creatures sometimes evolve on islands, a phenomenon known as the island syndrome. Geology professor Allan Krill recently suggested[74] that humans evolved by peripatric speciation on a barren volcanic island, in a scenario similar to that of the Galapagos Marine iguana. The chimpanzee-human last common ancestor may have accidentally rafted to proto-Bioko island of western Africa. As with the iguana, these arboreal animals may have been stranded with no forest foods, and their exclusively marine diet and semiaquatic habitat resulted in unique anatomical changes. Bioko has a rainy climate with neither strong sun nor cold nights, so body fur would not be as necessary there. Bioko has no large predators, so primates evolving into vulnerable humans could survive there without inventing weapons. Beaches on Bioko are visited by many sea turtles each night during much of the year, so turtle eggs and meat could have been shared by semiaquatic humans without tools or fire. Plentiful marine food may have supported large coastal populations, as with the marine iguana. Dense habitation may have led to self-domestication and Proto-Human language. Some hominins may have left Bioko and invented clothing, tools, and fire, that were necessary elsewhere. Because the warm humid climate of western Africa causes bones to decay rapidly, no mammal fossils have ever been reported from Bioko or any areas inhabited by chimpanzees or gorillas. Therefore there is no fossil evidence for chimpanzee or gorilla evolution, or for an early human presence on Bioko. If there was an average population of 10,000 semiaquatic humans on Bioko for 5 million years, this would be one billion people. The corpses of the 200 people who would have died each year could have been buried respectfully in the sea. Genetics might be able to test the Bioko hypothesis. Complementing the recent African origin of modern humans it seems possible that Neanderthals and early modern humans came directly from Bioko while it was connected to the mainland by a Pleistocene land bridge.

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