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We present the first study of the effects of ocean acidification on settlement of benthic invertebrates and microfauna. Artificial collectors were placed for 1 month along pH gradients at CO.sub.2 vents off Ischia (Tyrrhenian Sea, Italy). Seventy-nine taxa were identified from six main taxonomic groups (foraminiferans, nematodes, polychaetes, molluscs, crustaceans and chaetognaths). Calcareous foraminiferans, serpulid polychaetes, gastropods and bivalves showed highly significant reductions in recruitment to the collectors as pCO.sub.2 rose from normal (336-341 ppm, pH 8.09-8.15) to high levels (886-5,148 ppm) causing acidified conditions near the vents (pH 7.08-7.79). Only the syllid polychaete Syllis prolifera had higher abundances at the most acidified station, although a wide range of polychaetes and small crustaceans was able to settle and survive under these conditions. A few taxa (Amphiglena mediterranea, Leptochelia dubia, Caprella acanthifera) were particularly abundant at stations acidified by intermediate amounts of CO.sub.2 (pH 7.41-7.99). These results show that increased levels of CO.sub.2 can profoundly affect the settlement of a wide range of benthic organisms., Author(s): M. Cigliano [sup.1] , M. C. Gambi [sup.1] , R. Rodolfo-Metalpa [sup.2] [sup.3] , F. P. Patti [sup.1] , J. M. Hall-Spencer [sup.2] Author Affiliations: (1) grid.6401.3, 0000000417580806, Stazione [...]