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• W2316455598 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 70:189-205 (2013) - DOI: https://doi.org/10.3354/ame01644 Experimental assessment of marine bacterial respiration Sandra Martínez-García1,2,*, Emilio Fernández1, Daniela A. del Valle2, David M. Karl2, Eva Teira1 1Departamento Ecoloxía e Bioloxía Animal, Universidade de Vigo, Campus Lagoas-Marcosende, 36310 Vigo, Spain 2Center for Microbial Oceanography: Research and Education, University of Hawai’i, 1950 East-West Road, Honolulu, Hawaii 96822, USA *Email: sandramg@hawaii.edu ABSTRACT: We present a systematic experimental assessment of the effect of pre-incubation filtration procedures on marine bacterial respiration (BR) measurements. The in vivo electron transport system (ETS) method, which enables measurements of BR using short incubation times (~1 h) and without the requirement of pre-incubation size-fractionation procedures, was employed in 20 experiments from 2 different ecosystems: the NW Iberian Peninsula shelf and shelf-break, and the North Pacific Subtropical Gyre. BR was determined in both pre-incubation size-fractionated filtered (PF) and pre-incubation unfiltered (PU) treatments. Additionally, the effect of incubation time (up to 24 h) on BR, community respiration (CR), bacterial production (BP), and picoplankton community composition was assessed in 6 of the experiments; the standard oxygen consumption method (i.e. Winkler) was also applied in PF treatments. The mean contribution of BR to total CR (%BR) obtained with the in vivo ETS method in PU and short-time incubated samples was 31 ± 4% (mean ± SE; n = 20). PF procedures increased BR by 264 ± 46% (n = 20). This overestimation increased with incubation time. The %BR in PF 24 h-incubated samples was >100% using either the in vivo ETS method (%BR = 109 ± 31%, n = 6) or the Winkler method (%BR = 185 ± 34%, n = 6). By contrast, incubation time did not significantly affect BR or CR rates in the PU experiments. Metabolic changes during extended incubations following PF coincided with a significant increase in the proportion of very high nucleic acid content bacteria to total heterotrophic bacteria. In this study, PF combined with extended incubation times resulted in an overestimation of BR and %BR of ~300% and an underestimation of bacterial growth efficiency of ~50% compared to PU, short-incubated samples. These results may partially reconcile bacterial carbon consumption assessments and estimates of organic carbon flow in oligotrophic waters. KEY WORDS: Bacterial respiration · Filtration · Incubation time · Bacterial growth efficiency Full text in pdf format NextCite this article as: Martínez-García S, Fernández E, del Valle DA, Karl DM, Teira E (2013) Experimental assessment of marine bacterial respiration. Aquat Microb Ecol 70:189-205. https://doi.org/10.3354/ame01644 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 70, No. 3. Online publication date: September 18, 2013 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2013 Inter-Research." @default.
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• W2316455598 date "2013-09-18" @default.
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• W2316455598 title "Experimental assessment of marine bacterial respiration" @default.
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