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• W2321800818 abstract "AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 73:245-258 (2014) - DOI: https://doi.org/10.3354/ame01719 Carbon:phosphorus homeostasis of aquatic bacterial assemblages is mediated by shifts in assemblage composition Casey M. Godwin*, James B. Cotner Department of Ecology, Evolution, and Behavior, University of Minnesota, 1987 Upper Buford Circle, Saint Paul, Minnesota 55108, USA *Corresponding author: godwi018@umn.edu ABSTRACT: Several studies have noted a disparity between the stoichiometric regulation of bacterial assemblages and populations. In response to phosphorus availability, assemblages of bacteria often exhibit greater flexibility in their biomass carbon (C) to phosphorus (P) ratios (C:P) than axenic populations, some of which are homeostatic. We hypothesized that assemblages are inherently non-homeostatic as the result of resource-driven shifts in dominance between more homeostatic strains at low resource C:P ratios and highly flexible strains when P is scarce relative to C. We enriched 6 assemblages of heterotrophic bacteria from 4 lakes in Minnesota, USA, using chemostats with varying supply C:P ratios and measured the bacterial biomass C:P ratios. The initial assemblage cultures exhibited non-homeostasis in biomass C:P across treatments, but there was no significant effect of lake trophic state on the strength of homeostasis. This suggests that the non-homeostatic physiology was abundant in each of the lakes. Using the initial assemblage chemostat cultures as a species sorting filter, we subsequently cultured the high-P and low-P selected fractions at varying supply C:P ratios and found that all of the low-P selected fractions were non-homeostatic, and that the high-P selected fractions were strongly homeostatic in 3 of the lakes. These results demonstrate that multiple stoichiometric regulation strategies were present among in situ bacterial communities and confirm that high P availability can select for homeostatic bacterial strains. The divergence in stoichiometric regulation strategies was coupled with changes in the assemblage composition, which highlights the role of ecological selection in the stoichiometric homeostasis of assemblages. KEY WORDS: Heterotrophic bacteria · Phosphorus · Stoichiometry · Homeostasis · Lakes Full text in pdf format PreviousNextCite this article as: Godwin CM, Cotner JB (2014) Carbon:phosphorus homeostasis of aquatic bacterial assemblages is mediated by shifts in assemblage composition. Aquat Microb Ecol 73:245-258. https://doi.org/10.3354/ame01719 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 73, No. 3. Online publication date: December 05, 2014 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2014 Inter-Research." @default.
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• W2321800818 date "2014-12-05" @default.
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• W2321800818 title "Carbon:phosphorus homeostasis of aquatic bacterial assemblages is mediated by shifts in assemblage composition" @default.
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• W2321800818 doi "https://doi.org/10.3354/ame01719" @default.
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