Longitudinal Spatial Patterns of Bacterial Production and Respiration in a Large River–Estuary: Implications for Ecosystem Carbon Consumption

摘要: Rivers and estuaries transport organic carbon (C) from terrestrial freshwater ecosystems to the marine environment. During this transit, bacteria actively utilize transform C, but few studies have measured detailed spatial variation in rates of bacterial respiration (BR) production (BP). We BP at 39 stations BR 12 monthly intervals along a 200-km reach tidal Hudson River. observed strong repeatable patterns for both BR, with declining downstream direction. Bacterial Production had much greater dynamic range than BR. used seasonal data on measure total C demand several scales. calculated volumetric areal sections Hudson, as well utilization. Volumetric averaged 20 g-C-m–3 y–1, it was highest most upstream section 30 g m–3 y–1. Areal over entire river were 174 m–2 they 318 y–1 deepest river, indicating importance morphometric variation. Total increased downriver increasing volume. Overall, consumed approximately 18–25.5 × 109 about 20% load.