Evidence for a heterotrophic subtropical northeast Atlantic

Duarte, Carlos M.; Agustı́, Susana; Arı́stegui, Javier; González, Natalia; Anadón, Ricardo

doi:10.4319/lo.2001.46.2.0425

Cited by 97 publications

(111 citation statements)

References 15 publications

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“…del Giorgio and Duarte, 2002), and these two processes are not always correlated in marine systems (e.g. Duarte et al, 2001). Perhaps an answer to the question posed in del Giorgio and Beale et al, 2011;Dixon et al, 2011b).…”

Section: Discussionmentioning

confidence: 99%

Fine-scale variability in methanol uptake and oxidation: from the microlayer to 1000 m

Dixon

2012

Biogeosciences

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Abstract. The aim of this research was to make the first depth profiles of the microbial assimilation of methanol carbon and its oxidation to carbon dioxide and use as an energy source from the microlayer to 1000 m. Some of the highest reported methanol oxidation rate constants of 0.5-0.6 d −1 were occasionally found in the microlayer and immediately underlying waters (10 cm depth), albeit these samples also showed the greatest heterogeneity compared to other depths down to 1000 m. Methanol uptake into the particulate phase was exceptionally low in microlayer samples, suggesting that any methanol utilised by microbes in this environment is for energy generation. The sea surface microlayer and 10 cm depth also showed a higher proportion of bacteria with a low DNA content, and bacterial leucine uptake rates in surface microlayer samples were either less than or the same as those in the underlying 10 cm layer. The average methanol oxidation and particulate rates were however statistically the same throughout the depths sampled, although the latter were highly variable in the near-surface 0.25-2 m compared to deeper depths. The statistically significant relationship demonstrated between uptake of methanol into particles and bacterial leucine incorporation suggests that many heterotrophic bacteria could be using methanol carbon for cellular growth. On average, methanol bacterial growth efficiency (BGE m ) in the top 25 m of the water column is 6 % and decreases with depth. Although, for microlayer and 10 cm-depth samples, BGE m is less than the near-surface 25-217 cm, possibly reflecting increased environmental UV stress resulting in increased maintenance costs, i.e. energy required for survival. We conclude that microbial methanol uptake rates, i.e. loss from seawater, are highly variable, particularly close to the seawater surface, which could significantly impact upon seawater concentrations and hence the air-sea flux.

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Section: Discussionmentioning

confidence: 99%

Fine-scale variability in methanol uptake and oxidation: from the microlayer to 1000 m

Dixon

2012

Biogeosciences

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“…This would lead to a net heterotrophic P:R balance, as independently derived for the same region and sampling period by ) from measurements of community respiration estimated from in vitro changes in O 2 concentration after 24 h incubations. A net heterotrophic P:R on short timescales within the North Atlantic Subtropical Gyre was also reported by Duarte et al (2001) and Serret et al (2001), who measured rates of community respiration similar to those obtained by González et al (2001). A detailed and rigorous analysis of in vitro determinations of plankton community respiration conducted by Robinson et al (2002) in the eastern Atlantic showed that the unexpected respiration rates, in excess of gross production, found in the picoautotroph-dominated oligotrophic regions of the Atlantic Ocean was consistent with measured and estimated autotrophic and heterotrophic activity; Robinson et al (2002) concluded that the community respiration data were not grossly overestimated.…”

Section: Uncoupling Between Phytoplankton and Bacteria In The Upper Smentioning

confidence: 90%

Rates of dissolved organic carbon production and bacterial activity in the eastern North Atlantic Subtropical Gyre during summer

Teira¹,

Pazó²,

Quevedo³

et al. 2003

Mar. Ecol. Prog. Ser.

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“…Mean ± SE for (a) community respiration (CR), (b) gross primary production (GPP) and (c) net community production (NCP) (mmol O 2 m −3 d −1 ) for each season (winter, spring and summer) at the three sampled depths (surface, 20 % PAR and DCM). Duarte and Agustí, 1998;Duarte et al, 2013) and for the subtropical North Atlantic Ocean (Duarte et al, 2001;González et al, 2002;Serret et al, 2002Serret et al, , 2006Morán et al, 2004;Aranguren-Gassis et al, 2011). However, some studies have also shown balanced metabolism (Williams, 1998;Aranguren-Gassis and Serret, 2012) or a prevalence of autotrophic communities (Kähler et al, 2010), leading to challenges in the view that oligotrophic regions of the ocean support heterotrophic plankton communities (Williams et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Temperature dependence of planktonic metabolism in the subtropical North Atlantic Ocean

et al. 2014

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Abstract. The temperature dependence of planktonic metabolism in the subtropical North Atlantic Ocean was assessed on the basis of measurements of gross primary production (GPP), community respiration (CR) and net community production (NCP), as well as experimental assessments of the response of CR to temperature manipulations. Metabolic rates were measured at 68 stations along three consecutive longitudinal transects completed during the Malaspina 2010 Expedition, in three different seasons. Temperature gradients were observed in depth and at basin and seasonal scale. The results showed seasonal variability in the metabolic rates, the highest rates being observed during the spring transect. The overall mean integrated GPP / CR ratio was 1.39 ± 0.27 decreasing from winter to summer, and the NCP for the subtropical North Atlantic Ocean during the cruises exhibits net autotrophy (NCP > 0) in about twothirds (66 %) of the total sampled communities. Also, we reported the activation energies describing the temperature dependence of planktonic community metabolism, which was generally higher for CR than for GPP in the subtropical North Atlantic Ocean, as the metabolic theory of ecology predicts. Furthermore, we made a comparison of activation energies describing the responses to in situ temperature in the field (Ea CR = 1.64 ± 0.36 eV) and those derived experimentally by temperature manipulations (Ea CR = 1.45±0.6 eV), which showed great consistency.

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Evidence for a heterotrophic subtropical northeast Atlantic

Cited by 97 publications

References 15 publications

Fine-scale variability in methanol uptake and oxidation: from the microlayer to 1000 m

Fine-scale variability in methanol uptake and oxidation: from the microlayer to 1000 m

Rates of dissolved organic carbon production and bacterial activity in the eastern North Atlantic Subtropical Gyre during summer

Temperature dependence of planktonic metabolism in the subtropical North Atlantic Ocean

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