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Day and night levels are given for seventeen species of common copepods. The data are drawn from 64 stations in the Straits of Florida, east of Miami. The upward movement at night is greatest—186 m—in the deep-living Pleuormamma xiphias. Shallower species show less
extensive migration or none at all, and a number of them reverse the normal pattern and move upwards in the daytime and downwards at night. The most extreme case of reverse migration is Corycaeus lautus with a downward movement of 41 m.
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