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Densities of all marine debris, predominantly plastic, at sea in the southwest Atlantic and Atlantic sector of the Southern Ocean by 10° latitude and longitude areas. Shades of light to dark blue code for [r1]densities 0–1, 2–10, 11–100, 101–1000 and 1001+ items square kilometre, respectively. The survey years are (a) April 1993, (b) April 2002 and (c) April 2006. Data from Barnes & Milner (2005) and reported here for the first time.
