James Bradley at Literary Hub:
Each night, as the line that separates day from night sweeps across the face of the ocean, a vast wave of life rises from the ocean’s depths behind it. Made up of an astonishing diversity of animals—myriad species of minute zooplankton, jellyfish and krill, savage squid and a confusion of fish species ranging from lanternfish to viperfish and eels, as well as stranger creatures such as translucent larvaceans and snotlike salps—this world-spanning tide travels surfaceward to feed in the safety of the dark, before retreating to the depths again at dawn.
Known as the diel vertical migration, this nightly cycle is the single largest movement of life on Earth, with some estimates suggesting the biomass of the animals that make the journey may total 10 billion tons or more. So dense is this cloud of bodies, in fact, that in World War II, scientists working on early sonar were perplexed by readings showing a phantom sea floor that rose and fell at dusk and dawn.
More here.
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