Microplastic burden in invasive signal crayfish (<i>Pacifastacus leniusculus</i>) increases along a stream urbanization gradient.

Strong evidence for a highly significant positive effect of urban area size on total crayfish microplastic concentration was found ( F = 232.832, p < .001; Figure 5 ), as well as significant evidence of a negative effect of crayfish length ( F = 5.548, p = .024).

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Further, it demonstrates a positive trend between microplastic concentration in crayfish and urban area size, extending a trend reported for a range of other species.

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