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As a first attempt to relate net nitrification rates with bacterial community structure in the coastal embayment of the Ria de Vigo (NW Spain), a set of 6 long-term (lasting 53 to 74 d) dis- solved organic matter decomposition experiments were conducted in the dark and at a constant tem- perature of 15°C with surface seawater collected in January, February, April, and June 2008. Net nitrification rates were estimated from nitrate concentration changes. Evolution of bacterial commu- nity composition was followed using catalyzed reporter deposition-fluorescent in situ hybridization (CARD-FISH) and specific probes for 6 relevant bacterial groups, including Beta- and Gammapro- teobacteria. The growth rates of Betaproteobacteria showed a significant linear positive relationship with nitrification rates that explained 82% of the observed variability, which strongly suggests that the main nitrifying microorganisms during the incubations belonged to the Beta subclass of Pro- teobacteria. A positive relationship was found between net nitrification rates and both ammonium (r 2 = 0.92) and phosphate (r 2 = 0.97) concentrations, which suggests a tight link among the nitrogen and phosphorus cycles, likely as a result of the role of phosphate as the bacterial growth-limiting nutrient.

Betaproteobacteria growth and nitrification rates during long-term natural dissolved organic matter decomposition experiments