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. 2021 Mar 8;28(27):36102–36111. doi: 10.1007/s11356-021-13185-1

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© The Author(s) 2021

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Fig. 5 — Mean (±standard error) (a) microplastic particle ‘species’ (i.e. γ-diversity), (b) Whittaker β-diversity, (c) Shannon–Wiener index and (d) evenness across study sites and seasons. The arrows represent the position of sewage treatment works