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Non-Redfield, nutrient synergy and flexible internal elemental stoichiometry in a marine bacterium.
FEMS Microbiol. Ecol. 93:fix059 (2017)
Publ. Version/Full Text Research data DOI
The stoichiometric constraints of algal growth are well understood, whereas there is less knowledge for heterotrophic bacterioplankton. Growth of the marine bacterium Phaeobacter inhibens DSM 17395, belonging to the globally distributed Roseobacter group, was studied across a wide concentration range of NH 4 + and PO 4 3- . The unique dataset covers 415 different concentration pairs, corresponding to 207 different molar N:P ratios (from 10 -2 to 10 5 ). Maximal growth (by growth rate and biomass yield) was observed within a restricted concentration range at N:P ratios (50-120) markedly above Redfield. Experimentally determined growth parameters deviated to a large part from model predictions based on Liebig's law of the minimum, thus implicating synergistic co-limitation due to biochemical dependence of resources. Internal elemental ratios of P. inhibens varied with external nutrient supply within physiological constraints, thus adding to the growing evidence that aquatic bacteria can be flexible in their internal elemental composition. Taken together, the findings reported here revealed that P. inhibens is well adapted to fluctuating availability of inorganic N and P, expected to occur in its natural habitat (e.g. colonized algae, coastal areas). Moreover, this study suggests that elemental variability in bacterioplankton needs to be considered in the ecological stoichiometry of the oceans.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Ecological Stoichiometry ; Growth Physiology ; Liebig Limitation ; N:p Ratio ; Phaeobacter Inhibens Dsm 17395 ; Redfield; Inhibens Dsm 17395; C-n-p; Aquatic Heterotrophic Bacteria; Phaeobacter-inhibens; Roseobacter-clade; Phosphorus Stoichiometry; Growth-rate; Inorganic Nutrients; Organic-matter; Fresh-water
ISSN (print) / ISBN 0168-6496
Journal FEMS Microbiology Ecology
Quellenangaben Volume: 93, Issue: 5, Article Number: fix059
Publishing Place Oxford
Reviewing status Peer reviewed
Institute(s) Research Unit Analytical BioGeoChemistry (BGC)