Abstract
Abstract Free-living copepods come in predatory, omnivorous and mostly herbivorous versions, with appropriate sensory systems and limb structures for obtaining those meals. Corycaeus species are among the few predators that see their prey, clasp them with antennae modified as claws, then scrape nutrition with rasping mouthparts. Euchaeta (and other genera) directionally sense the sources of micro-eddies from swimmers around them with innervated antennular setae. They lunge toward the eddy source, impaling it with saber-like setae on their maxillae and maxillipeds. Jeannette Yen studied the details, and a bio covers her early career. Means for feeding on particles much less than 1 mm proved difficult to describe, at least correctly. However, studies of “particle clearance rates” were markedly improved in the 1970s using automated cell counting devices. Observed rates depend upon hunger level, particle size and particle concentration. Clearance rates for a copepod rise with food-particle concentration, then plateau, a curve termed its “functional response.
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