Ronald Benner: https://orcid.org/0000-0002-1238-2777

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Community respiration rates were measured in unfiltered seawater collected in the upper 75 m of the water column along a transect in the Sargasso Sea and at the Bermuda Atlantic Time-series Study (BATS) station (31° 50’ 00 N; 64° 10’ 00 W) during a cruise in June and July 2001. Community respiration rates in the upper 75 m of the water column averaged 1.1 ± 0.4 μM O2 d-1 and exhibited significant spatial and temporal variability. Concurrent determination of the heterotrophic and autotrophic community revealed no relationship between community respiration and the abundance of any of the major metabolic groups. Addition of inorganic nutrients (NO3 and PO4) and organic carbon (glucose) indicated that community respiration was P-limited in the surface mixed layer. Size-fractionation experiments indicated that the abundance of heterotrophic bacteria in the

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Obernosterer, I., Kawasaki, N., & Benner, R. (2003). P-Limitation of Respiration in the Sargasso Sea and Uncoupling of Bacteria from P-Regeneration in Size-Fractionation Experiments. Aquatic Microbial Ecology, 32(3), 229–237. https://doi.org/10.3354/ame032229

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