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Oceanic heterotrophic bacterial nutrition by semilabile DOM as revealed by data assimilative modeling

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dc.contributor.author Luo, Ya-Wei
dc.contributor.author Friedrichs, Marjorie A. M.
dc.contributor.author Doney, Scott C.
dc.contributor.author Church, Matthew J.
dc.contributor.author Ducklow, Hugh W.
dc.date.accessioned 2011-04-08T17:56:47Z
dc.date.available 2011-04-08T17:56:47Z
dc.date.issued 2010-08-03
dc.identifier.citation Aquatic Microbial Ecology 60 (2010): 273-287 en_US
dc.identifier.uri http://hdl.handle.net/1912/4447
dc.description Author Posting. © Inter-Research, 2010. This article is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in Aquatic Microbial Ecology 60 (2010): 273-287, doi:10.3354/ame01427. en_US
dc.description.abstract Previous studies have focused on the role of labile dissolved organic matter (DOM) (defined as turnover time of ~1 d) in supporting heterotrophic bacterial production, but have mostly neglected semilabile DOM (defined as turnover time of ~100 to 1000 d) as a potential substrate for heterotrophic bacterial growth. To test the hypothesis that semilabile DOM supports substantial amounts of heterotrophic bacterial production in the open ocean, we constructed a 1-dimensional epipelagic ecosystem model and applied it to 3 open ocean sites: the Arabian Sea, Equatorial Pacific and Station ALOHA in the North Pacific Subtropical Gyre. The model tracks carbon, nitrogen and phosphorus with flexible stoichiometry. This study used a large number of observations, including measurements of heterotrophic bacterial production rates and standing stocks, and DOM concentration data, to rigorously test and constrain model output. Data assimilation was successfully applied to optimize the model parameters and resulted in simultaneous representation of observed nitrate, phosphate, phytoplankton and zooplankton biomass, primary production, heterotrophic bacterial biomass and production, DOM, and suspended and sinking particulate organic matter. Across the 3 ocean ecosystems examined, the data assimilation suggests semilabile DOM may support 17 to 40% of heterotrophic bacterial carbon demand. In an experiment where bacteria only utilize labile DOM, and with more of the DOM production assigned to labile DOM, the model poorly represented the observations. These results suggest that semilabile DOM may play an important role in sustaining heterotrophic bacterial growth in diverse regions of the open ocean. en_US
dc.description.sponsorship Y.W.L. was supported by fellowships from the Virginia Institute of Marine Sciences and Marine Biological Laboratory as well as NSF Grants OPP-0217282 and 0823101 to H.W.D. and VIMS and MBL, respectively. M.A.M.F.’s participation was supported in part by a grant from the NASA Ocean Biology and Biogeochemistry program (NNX07AF70G), S.C.D.’s participation was supported by an NSF grant to the Center for Microbial Oceanography, Research and Education (CMORE), NSF EF-0424599, and M.J.C. was supported in part by NSF grants EF-0424599 (C-MORE) and OCE 0425363. en_US
dc.format.mimetype application/pdf
dc.language.iso en en_US
dc.publisher Inter-Research en_US
dc.relation.uri http://dx.doi.org/10.3354/ame01427
dc.subject Heterotrophic bacteria en_US
dc.subject Semilabile dissolved organic matter en_US
dc.subject Marine ecosystem model en_US
dc.subject Data assimilation en_US
dc.title Oceanic heterotrophic bacterial nutrition by semilabile DOM as revealed by data assimilative modeling en_US
dc.type Article en_US
dc.identifier.doi 10.3354/ame01427


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