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The effect of sampling frequency on estimates of the rate of litter accumulation was determined for two South African sandy beaches. After initial cleaning, all manufactured items >10mm diameter were collected in alternating bouts of daily or weekly cleanups. Daily sampling collected 2.5 (range 2.1–3.4) times more litter items than weekly samples and 1.7 (1.3–2.3) times more litter by mass. Low...
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