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Journal Article

Tracing carbon and nitrogen incorporation and pathways in the microbial community of a photic subtidal sand

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Cook,  P. L. M.
HGF MPG Joint Research Group for Deep Sea Ecology & Technology, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Huettel,  M.
Flux Group, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Citation

Evrard, V., Cook, P. L. M., Veuger, B., Huettel, M., & Middelburg, J. J. (2008). Tracing carbon and nitrogen incorporation and pathways in the microbial community of a photic subtidal sand. Aquatic Microbial Ecology, 53(3), 257-269.


Cite as: https://hdl.handle.net/21.11116/0000-0001-CD08-0
Abstract
The pathways and fate of C and N in the microbial compartment of a coastal permeable sandy sediment in the photic zone were studied in a pulse-chase experiment. 13C-bicarbonate and 15N-nitrate were added to the water column on top of 5 sediment cores incubated in 4 transparent and 1 opaque laboratory chambers. After 9 h of labelling in the light and dark, stable isotope incorporation by microphytobenthos (MPB) and bacteria was quantified over a period of 4 d through the analysis of phospholipid-derived fatty acids (PLFA) and hydrolysable amino acids (HAA). 13C was fixed by MPB, and more than 50% was directed to the production of extracellular polymeric substance (EPS). MPB 15N incorporation was similar in the dark and in the light. Bacterial activity appeared to have 2 effects that depended on sediment depth: at the sediment surface, there was a steady increase of label in the bacterial PLFA, suggesting metabolism of label-containing EPS; in the subsurface layers, uniform enrichment started immediately after the labelling procedure, indicating continuous incorporation of inorganic C by chemoautotrophic bacteria (Cbac). This experiment demonstrates the efficient transfer of inorganic C and N to the benthic community through the activities of photo- and chemoautotrophic microorganisms, and the role of EPS as a carrier of energy to the benthic microbial food web.