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Colonization of new surfaces by the spirorbid Neodexiospira pseudocorrugata after 100 days exposure to either pH 7.9 (control) or pH 7.7. Values shown are means ± SE and presented as numbers per 10 cm2. All before and after differences were significant (Kruskal–Wallis tests, H > 18.6 in all cases) at P < 0.0001, indicated on figure by ***.
