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(a) Biocontamination indices (ACI: Abundance Contamination Index, RCI-Fam: Richness Contamination Index at family level) and Site-specific Biocontamination Index at family level (SBCI-Fam) at all 48 sites (colours as in Fig. 1). (b) Relative proportion of nine most widespread NIMS in total abundance of all NIMS (sum of NIMS = 100%, rare species summed as other NIMS) at each site.
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