In June of 1945, he tested the idea on an overnight excursion in the waters off Point Loma, California. Scripps Institution of Oceanography scientist Martin Johnson proposed an explanation: The deep scattering layer could be marine animals migrating up to the surface. Then, during World War II, came the discovery of the “deep scattering layer”: a zone in the oceans that unexpectedly deflected pings of Navy sonar and mysteriously disappeared each night, like a phantom seabed. The migration was first documented in the early 1800s, when naturalist Georges Cuvier noted that plankton called daphnia - water fleas - were disappearing and reappearing in a daily cycle in a shallow freshwater lake. Living World Mixing it up in the web of life
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