Calanoid Copepods, Feeding Currents, and the Role of Gravity

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Science  08 Oct 1982:
Vol. 218, Issue 4568, pp. 158-160
DOI: 10.1126/science.218.4568.158


Feeding currents of free-swimming calanoid copepods, observed through an expanded krypton laser beam and a back-focus dark-field optical system, show that these planktonic animals generate a double shear field to help in detecting food. The interrelation between flow field, perception of food items, and body orientation explains why these animals are generally negatively buoyant.