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Density (log10-transformed) on natural (Nat.- above x-axis) and artificial substrate (Art.-below x-axis) of seven species, Chelicorophium sp., and native and alien species grouped together at 15 sites where the density was established by replicate sampling (n = 10) on two types of microhabitats. *Significant differences (GLM for count data with Bonferroni correction; n.s.-not significant, n.t.-not tested if density <2 ind. m−2).
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