Estimation of bacterial respiration and growth efficiency in the Ross Sea, Antarctica

Carlson, Craig A.; Bates, Nick; Ducklow, Hugh W.; Hansell, Dennis A.

doi:10.3354/ame019229

Cited by 123 publications

(80 citation statements)

References 58 publications

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“…3d). For example, the BGE average value of 0.46 ± 0.16 for controls was double the values reported previously for other marine areas using short-and long-term incubations (del Giorgio and Cole 1998), and for other estimations of BGE in polar waters [0.27 ± 0.01 in the surface waters of the Arctic's Kara Sea (Meon and Amon 2004) and 0.25 ± 0.13 in the Ross Sea (Carlson et al 1999)]. Only in situ estimations of BGE (0.20, Fig.…”

Section: Discussionsupporting

confidence: 55%

Organic carbon and mineral nutrient limitation of oxygen consumption, bacterial growth and efficiency in the Norwegian Sea

et al. 2011

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To evaluate the role of bacteria in the transformation of organic matter in subarctic waters, we investigated the effect of mineral nutrients (ammonia and phosphate) and organic carbon (glucose) enrichment on heterotrophic bacterial processes and community structure. Eight experiments were done in the Norwegian Sea during May and June 2008. The growth-limiting factor (carbon or mineral nutrient) for heterotrophic bacteria was inferred from the combination of nutrient additions that stimulated highest bacterial oxygen consumption, biomass, production, growth rate and bacterial efficiency. We conclude that heterotrophic bacteria were limited by organic carbon and co-limited by mineral nutrients during the prevailing early nano-phytoplankton (1-10 lm) bloom conditions. High nucleic acid (HNA) bacteria became dominant ([80%) only when labile carbon and mineral nutrient sources were available. Changes in bacterial community structure were investigated using denaturing gradient gel electrophoresis (DGGE) of polymerase chain reaction (PCR)-amplified 16S ribosomal RNA genes. The bacterial community structure changed during incubation time, but neither carbon nor mineral nutrient amendment induced changes at the end of the experiments. The lack of labile organic carbon and the availability of mineral nutrients are key factors controlling bacterial activity and the role of the microbial food web in carbon sequestration.

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Section: Discussionsupporting

confidence: 55%

Organic carbon and mineral nutrient limitation of oxygen consumption, bacterial growth and efficiency in the Norwegian Sea

et al. 2011

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“…For instance, a 9-fold range of carbon conversion factors exists for the per cell of heterotrophic bacteria in the literature (cf. Carlson et al, 1999). Recent calculations tend to use lighter conversion factors such as 11, 35 and 6…”

Section: Enumericationmentioning

confidence: 99%

Latitudinal Differences in the Planktonic Biomass and Community Structure Down to the Greater Depths in the Western North Pacific

Yamaguchi

Watanabe²,

Ishida³

et al. 2004

Journal of Oceanography

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As part of the research program WEST-COSMIC Phase I (1997, vertical profiles down to the greater depths (0-2000 m or 5800 m) of the plankton community structure composed of heterotrophic bacteria, phytoplankton, protozooplankton and metazooplankton were studied at one station in each subarctic (44˚N) and in transitional region (39˚N), and two stations in subtropical region (30˚N and 25˚N); all in 137-155˚E in the western North Pacific Ocean. The biomass of all four taxonomic groups decreased rapidly with increasing depths at all stations, although the magnitude of depth-related decrease differed among the groups. As plankton community structure, metazooplankiton biomass and bacterial biomass occupied >50% of the total in 0-2000 and 2000-4000 or 5000 m strata, respectively, at subarctic and transitional stations, while bacterial biomass contributed to >50% of the total consistently from 0 through 4800 or 5800 m at subtropical stations. Metazooplankton biomass integrated over the greater depths exhibited a clear latitudinal pattern (high north and low south), but this was not the case for those of the other taxonomic groups. As a component of metazooplankton, an appreciable contribution of diapausing copepods to the metazooplankton was noted at subarctic and transitional stations, but they were few or nil at subtropical stations.As protozooplankton assemblages, heterotrophic microflagellates (HMF) and dinoflagellates were two major components at subarctic and transitional stations, but were only HMF predominated at subtropical stations.From biomass ratios between heterotrophic bacteria, HMF and dinoflagellates, "sinking POC-DOC-heterotrophic bacteria-HMF-heterotrophic dinoflagellates" link was proposed as a microbial food chain operative in the deep layer of the western NorthPacific. All results are discussed in the light of latitudinal differences in the structure and functioning of plankton community contributing to the 'biological pump' in the western North Pacific Ocean.

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“…However, the emergence of new data and knowledge necessitated a reformulation of these initial conclusions (Ducklow et al 2002). The change was precipitated by new assessments of bacterial growth efficiency (BGE), which had been assumed to be ∼50%, 3-fold higher than the value of 15% suggested by new data (del Giorgio & Cole 1998, Carlson et al 1999. When the lower estimates of BGE were taken into consideration, it appeared that BP should be lower relative to PP, and that the BP:PP ratio cannot be higher than 0.15 (Ducklow et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Carbon cycling by microbes influenced by light in the Northeast Atlantic Ocean

Cottrell¹,

Michelou²,

Nemcek³

et al. 2008

Aquat. Microb. Ecol.

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The goal of this study was to examine the relationships between phytoplankton and heterotrophic bacteria and the effect of light on bacterial growth and respiration in the Northeast Atlantic Ocean in summer. Heterotrophic microbes were a substantial component of the plankton as indicated by the ratio of bacterial biomass to phytoplankton biomass, which varied from 0.15 to 0.83, averaging 0.60. Aerobic anoxygenic phototrophic (AAP) bacteria made up on average 10% of bacterial abundance and 13% of bacterial biomass. AAP bacterial biomass was on average 2-fold higher than Synechococcus sp. biomass, whereas Prochlorococcus sp. was never more than 1% of bacterial biomass. The bacterial production to primary production ratio ranged from 0.04 to 0.14 and was on average 0.07. The bacterial growth efficiency (BGE) in light incubations (10%) was 3-fold lower than in the dark (32%). Consequently, the calculated flux of carbon through bacteria in the light was also about 3-fold lower in the dark, since ratios of bacterial carbon demand (BCD) to primary production inferred from light and dark estimates of BGE were 0.7 and 0.2, respectively. However, BCD and respiration rates were not greater than primary production, suggesting that this region of the North Atlantic was net autotrophic even after the spring bloom. The BGE data and the abundance of photoheterotrophic microbes, such as AAP bacteria, highlight the importance of the effects of light on carbon cycling by bacteria in the Northeast Atlantic Ocean.

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Estimation of bacterial respiration and growth efficiency in the Ross Sea, Antarctica

Cited by 123 publications

References 58 publications

Organic carbon and mineral nutrient limitation of oxygen consumption, bacterial growth and efficiency in the Norwegian Sea

Organic carbon and mineral nutrient limitation of oxygen consumption, bacterial growth and efficiency in the Norwegian Sea

Latitudinal Differences in the Planktonic Biomass and Community Structure Down to the Greater Depths in the Western North Pacific

Carbon cycling by microbes influenced by light in the Northeast Atlantic Ocean

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