Ordination plots of the first two CAs produced by CAP comparing bacterial TRLFP patters from microcosm soils amended with 50 ng g−1 AuCl4−(aq) (filled symbols) to unamended incubations (unfilled symbols after 0 (Δ) 2 (▾, ▿), 10 (▪, □) and 30 (♦, ⋄) days of incubation with samples from Old Pirate (a), Humpback (b) and Wildcat (c).