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Aquatic Microbial Ecology

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AME 58:141-151 (2010)  -  DOI:

Temperature and phosphorus regulating carbon flux through bacteria in a coastal marine system

Emma S. Kritzberg1,2,*, Jesus M. Arrieta1, Carlos M. Duarte1

1IMEDEA, CSIC-Universitat Illes Balears, Miquel Marques 21, Esporles 07190, Spain
2Lund University, Department of Ecology/Limnology, Ecology Building, 223 62 Lund, Sweden

ABSTRACT: The aim of this study was to explore the variation and regulation of bacterial carbon processing at a coastal oligotrophic site of the Island of Majorca in the Mediterranean Sea. In situ bacterial production (BP), respiration (BR), growth efficiency, and carbon demand in relation to environmental parameters were studied over an annual cycle. In addition, the response of bacterial carbon processing to an experimental resource (phosphate) and temperature manipulations was tested. While concentrations of dissolved organic carbon (DOC) and phosphorus were fairly stable over the year, BP and BR varied 65-fold and 79-fold, respectively. Addition of phosphate stimulated both BP and BR during most of the year, suggesting that phosphorus limitation keeps a tight rein on bacterial DOC utilization. Both BP and BR responded positively to a 2°C experimental increase, but at higher temperature increases BP and BR leveled off or decreased. In situ BP and BR were positively related to temperature, suggesting that elevated water temperature would yield increased BP and BR. BR responded more strongly to temperature than BP, suggesting that increased temperature may result in a decrease in bacterial growth efficiency.

KEY WORDS: Bacterial carbon processing · Bacterial growth efficiency · Temperature regulation · Resource regulation · Phosphorus limitation

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Cite this article as: Kritzberg ES, Arrieta JM, Duarte CM (2010) Temperature and phosphorus regulating carbon flux through bacteria in a coastal marine system. Aquat Microb Ecol 58:141-151.

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