Bacterial Response to Variation in Dissolved Organic Matter

摘要: Publisher Summary Dissolved organic matter (DOM) is often the largest input of carbon to aquatic ecosystems, and benthic or pelagic bacteria presumably mediate many transformations DOM into biomass inorganic components. This chapter discusses two independent, but potentially covarying variables that may affect microbial responses: (1) bulk concentration DOM, (2) known inferred composition DOM. The availability nutrients has significant effects on bacterial growth, even in ecosystems where ambient nutrient concentrations suggest they should not be limiting. Extracellular enzymes appear more responsive (greater scope) than production respiration, implying there sufficient dynamic range for these catabolize shifting sources Experiments commonly assayed enzymes, with highest activity, greatest scope have a role N P acquisition. pattern again suggests particularly strong regulatory degradative activity.