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Scales of Spatial Heterogeneity of Plastic Marine Debris in the Northeast Pacific Ocean

Figure 6

Number of samples necessary to detect changes in microplastic concentration.

A) The number of samples necessary (x-axis) to detect a percentage increase in the abundance of microplastic (y-axis) with a certain power (z-axis). For example, using a power of 80%, detection of a 50% increase in microplastic would require a sample size of n = 240. Analysis is based on surface microplastic data from Summer 2009. B) The number of samples necessary to reduce standard deviation of surface microplastic abundance. Dashed line is n = 119, the number of surface microplastic samples collected in Summer 2009. Dotted line is n = 28, the number of surface samples collected in Fall 2010. Analysis is based on surface microplastic data from Summer 2009 and Fall 2010.

Figure 6

doi: https://doi.org/10.1371/journal.pone.0080020.g006