History
In a 1942 book, the German pathologist Max Westenhöfer published the idea of humans evolving in proximity to water with the statement "The postulation of an aquatic mode of life during an early stage of human evolution is a tenable hypothesis, for which further inquiry may produce additional supporting evidence."
From 1930, marine biologist Alister Hardy had hypothesized that humans may have had ancestors more aquatic than previously imagined. Because it was outside his field and he was aware of the controversy it would cause, Hardy delayed reporting his hypothesis. After he had become a respected academic, Hardy finally voiced his thoughts in a speech to the British Sub-Aqua Club in Brighton on 5 March 1960. A national newspaper reported a distorted interpretation of Hardy's ideas, which he countered by explaining them more fully in an article in New Scientist on 17 March 1960. Hardy defined his idea:
My thesis is that a branch of this primitive ape-stock was forced by competition from life in the trees to feed on the sea-shores and to hunt for food, shell fish, sea-urchins etc., in the shallow waters off the coast. I suppose that they were forced into the water just as we have seen happen in so many other groups of terrestrial animals. I am imagining this happening in the warmer parts of the world, in the tropical seas where Man could stand being in the water for relatively long periods, that is, several hours at a stretch.
The idea received some interest after the article was published, but was generally ignored by the scientific community thereafter. In 1967, the hypothesis was briefly mentioned in The Naked Ape, a book by Desmond Morris in which can be found the first use of the term "aquatic ape". Writer Elaine Morgan read about the idea in Morris' book and was struck by its potential explanatory power, becoming its main promoter and publishing six books over the next 40 years. In 1987 a symposium was held in Valkenburg, the Netherlands, to debate the pros and cons of AAH. The proceedings of the symposium were published in 1991 with the title "Aquatic Ape: Fact or fiction?". The chief editor summarized the results of the symposium as failing to support the idea that human ancestors were aquatic, but there is also some evidence that they may have swum and fed in inland lakes and rivers, with the result that modern humans can enjoy brief periods of time spent in the water.
Weaker versions of the hypothesis suggesting littoral feeding and wading rather than strong aquatic adaptation have since been proposed. These weaker versions of the hypothesis have not yet been scientifically explored.
The context of the initial presentations of AAH (a popular essay and a political text) diverted attention away from the possible scientific merits of the hypothesis. It has never been seriously scrutinized and discussed within the field of paleoanthropology and most paleoanthropologists reject the AAH.
Read more about this topic: Aquatic Ape Hypothesis
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