Nematode diversity and dynamics of a full-scale rotating biological contactor plant (RBC) has been studied. Analysis of biofilm composition showed a well-established zoning of microfauna among the three RBC sections analysed. Nematodes appeared to be the dominant group within the larger microfauna populations with average abundances between 200 and 300ind/mg or 8000 and 17000ind/cm(2). The most abundant nematode species were Diplogasteritus nudicapitatus and Paroigolaimella coprophages and, to a lesser extent, Paroigolaimella bernensis and Steinernema intermedia. The relationship between nematodes and filamentous bacteria (specifically the genus Beggiatoa) was the most significant biotic relationship found, and to a lesser extent, nematodes with ciliates. The relationship between the abundance of nematode species and the physical-chemical variables suggests that nematodes may be good indicators of low pollutant load levels in the entry of the RBC system. Finally, the results indicate that nematodes may have a relevant role for a good biofilm development.
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