Lifestyle Differentiation Among Marine Denitrifying Microorganisms.

Marine denitrifiers exhibit distinct lifestyle strategies, with copiotrophs dominating in nutrient-rich conditions and oligotrophs in nutrient-limited environments, influencing nitrogen cycling.

• Why it matters: Understanding the ecological roles and diversity of denitrifiers is crucial because they regulate bioavailable nitrogen loss and greenhouse gas emissions in marine ecosystems, yet their functional trait variations remain poorly understood.
• What they did: A comprehensive genomic database and a mathematical ecosystem model were developed, resolving microbial functional types into copiotrophs and oligotrophs across denitrification modules, and analyzing their community dynamics.
• The result: Findings reveal that N2O-producing NO3- reducers tend to be copiotrophs in substrate-replete conditions, while NO2- reducers are oligotrophs, providing insights into biogeochemical conditions that influence greenhouse gas emissions and nitrogen cycling in warming oceans.