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Abstract
The potential for ingestion of plastic particles by open ocean filter feeders was
assessed by measuring the relative abundance and mass of neustonic plastic and zooplankton
in surface waters under the central atmospheric high-pressure cells of the North Pacific
Ocean. Neuston samples were collected at 11 random sites, using a manta trawl lined
with 333 u mesh. The abundance and mass of neustonic plastic was the largest recorded
anywhere in the Pacific Ocean at 334271 pieces km2 and 5114 g km2, respectively. Plankton
abundance was approximately five times higher than that of plastic, but the mass of
plastic was approximately six times that of plankton. The most frequently sampled
types of identifiable plastic were thin films, polypropylene/monofilament line and
unidentified plastic, most of which were miscellaneous fragments. Cumulatively, these
three types accounted for 99% of the total number of plastic pieces.