Arthur C. Clarke? Paraphrase? Apocryphal?

Question for Quote Investigator: The intelligence of humanity has enabled its absolute dominance of the biosphere; however, this trait has also generated frightening existential risks such as the danger of nuclear warfare. Science fiction luminary Arthur C. Clarke has received credit for the following remark:
It has yet to be proved that intelligence has real survival value.
Would you please help me to find a citation?
Reply from Quote Investigator: In 1972 Arthur C. Clarke published “The Lost Worlds of 2001” which contained information about his collaboration with auteur Stanley Kubrick on the film “2001: A Space Odyssey”. Clarke began to write a novel in 1964 to provide a backbone for the movie. The story was extensively modified during the joint effort with Kubrick to construct a screenplay. Clarke released his final rewritten novel in 1968 which diverged from the early novel and from the screenplay.
“The Lost Worlds of 2001” included extensive excerpts from the previously unpublished early novel. The extraterrestrial visitors in the early novel built pyramidal structures instead of the rectangular monoliths used in the 1968 film. During one scene the astronaut David Bowman spoke with an anthropologist named Anna Brailsford about the beings who had landed on the Earth and Moon roughly three million years in the past:1
Perhaps there’s a plateau for intelligence that can’t be exceeded. They may already have reached it when they visited the Moon. After all, it has yet to be proved that intelligence has real survival value.”
“I can’t accept that!” protested Bowman. “Surely, our intelligence has made us what we are—the most successful animals on the planet!”
Thus, the quotation was spoken by a fictional anthropologist character in a work by Clarke. In addition, the citation given below reveals Clarke’s attitude of fear and ambivalence toward intelligence in species.
Below are additional selected citations in chronological order.
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