Bacterial carbon metabolism in the Amazon River system

Benner, Ronald; Opsahl, Stephen P.; Chin-Leo, Gerardo; Richey, Jeffrey E.; Forsberg, Bruce R.

doi:10.4319/lo.1995.40.7.1262

Cited by 150 publications

(117 citation statements)

References 32 publications

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“…Las densidades bacterianas encontradas en la columna de agua fueron similares a las de las regiones templadas. Benner et al (1995), Pace and Cole (1996), Posch et al (1997) y Tuomi et al (1997) hallaron abundancias numéricas semejantes y poca variación cuando se estudian sistemas acuáticos muy diversos; algunos de estos trabajos sólo registran diferencias entre aguas oxigenadas y anóxicas. Según Cole et al (1993) y Biddanda et al (2001, la abundancia bacteriana en diferentes ecosistemas acuáticos varía solamente en uno a dos órdenes de magnitud (10 4 a 10 5 células ml -1 ), de manera similar a lo encontrado en este trabajo.…”

Section: Discussionunclassified

Relaciones entre las abundancias del bacterioplancton y del fitoplancton en tres ecosistemas lénticos de los Andes Colombianos

Canosa¹,

Pinilla²

2001

RBT

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Relations between bacterioplankton and phytoplankton abundance in three lentic ecosystems in the Colombian Andes. We analyzed relations among phytoplankton and total bacterioplankton fractions in three lentic ecosystems (Neusa and Prado dams, and Fúquene lagoon) with different physicochemical characteristics, in the Andes of Colombia. Samplings were made in three sites of each water body during three surveys. Neusa dam (meso to oligotrophic) had the lowest bacterial concentration; Prado dam (eutrophic) had a high bacterial and algal abundance, and the Fúquene lagoon (mesotrophic) had lower concentrations of phytoplankton but a high relative concentration of bacteria, probably because of its particular conditions: high organic matter and low nutrient levels in the water. There was a negative correlation of total bacterioplankton with the phytoplankton (Pearson=-0.4479, p=0.019, n=27) and a positive correlation between phytoplankton and heterotrophic bacteria (Pearson=0.3866, p=0.062, n=24) and between total bacterioplankton and DBO 5 (Pearson=0.4088, p=0.034, n=27). Apparently, total bacterioplankton and phytoplankton were not coupling, but cultivable bacteria and the phytoplankton had some degree of relationship. Rev. Biol. Trop. 55 (1): 135-146. Epub 2007 March. 31.

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Section: Discussionunclassified

Relaciones entre las abundancias del bacterioplancton y del fitoplancton en tres ecosistemas lénticos de los Andes Colombianos

Canosa¹,

Pinilla²

2001

RBT

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“…in contrast, thirteen other relatively unpolluted tropical coastal lagoons in rio de Janeiro state have an average of 3.65 µg chl a l -1 (Farjalla et al, 2001). the observed initial bacterial abundance (3.4 x 10 9 cells l -1 ), biomass (2.4 µm c), and secondary productivity (0.032 µm c h -1 ) are within the range of most tropical freshwater ecosystems (torréton et al, 1994;Benner et al, 1995;lindell & edling, 1996;Anesio et al, 1997;thomaz & esteves, 1997;Bouvy et al, 1998). direct disposal of sewage into imboassica lagoon, although stimulating phytoplankton growth (melo, 2001), has not resulted in higher bacterial abundance, biomass, and secondary productivity than that found in other, less impacted Brazilian tropical coastal lagoons (Farjalla et al, 2001;Farjalla et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

Bacterial growth and DOC consumption in a tropical coastal lagoon

Farjalla¹,

Enrich‐Prast²,

Esteves³

et al. 2006

Braz. J. Biol.

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The aims of this research were to determine the main limiting nutrient to bacterial growth in Imboassica lagoon, southeastern Brazil, to estimate the percentage of dissolved organic carbon (DOC) available for bacterial growth, and to determine the bacterial growth efficiency (BGE) of natural assemblages. Bacterial growth and DOC consumption were determined in batch culture experiments, in which water samples were supplemented with nitrogen and phosphorus together or separately, or incubated without nutrient additions. When added together, N and P stimulated higher bacterial growth rates and production, as well as higher DOC consumption. The BGEs and DOC consumption rates were strongly dependent on the method used to determine bacterial production. The BGE ranged from 11 to 72%. However, only a minor fraction of bulk DOC was consumed by the planktonic bacteria (from 0.7 to 3.4%). The results suggest that low availability of phosphorus and nitrogen coupled with excess organic carbon was the main factor responsible for the relatively low bacterial utilization of DOC in Imboassica lagoon.

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“…Dark respiration and respiratory fractionation of O 2 isotopes-Incubation bottles were filled with water from 3 m depth and incubated (24-96 h) in a thermostat at in situ temperature. In recent studies, Quay et al (1995) and Benner et al (1995) showed that changes in incubation bottle volumes did not influence respiration rate or isotopic fractionation. Thus, in the present study, we used 300-ml BOD bottles, from which duplicate samples were taken for isotopic measurements.…”

Section: O 2 Gross Production-hmentioning

confidence: 99%

Evaluation of community respiratory mechanisms with oxygen isotopes: A case study in Lake Kinneret

Luz

Barkan

Sagi

et al. 2002

Limnology & Oceanography

125

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Gross and net O 2 production between May 1996 and February 1999 was determined in bottle incubation experiments with H 2 18 O spike and from the change in O 2 concentration. Carbon fixation rates were obtained from 14 C incubations. In general, production rates determined using the H 2 18 O-spike were about twice the primary production determined by the 14 C method, where the latter was close to net oxygen evolution. These relationships are similar to results for the open ocean. During the spring bloom, when the dinoflagellate Peridinium was abundant, the ratio of gross O 2 production to carbon fixation was about 7.5, and net O 2 production was greater than carbon fixation. The difference between O 2 gross production and carbon fixation results, at least in part, from uptake by Mehler reaction and from recycling of the 14 C tracer by dark respiration and the alternative oxidase (AOX). We used the difference in isotopic discrimination against 18 O, occurring during O 2 consumption by various biological pathways, to place constraints on the relative engagement of these pathways. We estimated the overall discrimination against 18 O in the lake from O 2 isotopic mass balance as 20.5-29‰. The only mechanism that can explain the strong overall fractionation in the lake is AOX, which strongly discriminates against 18 O (ϳ31‰). Our results show, for the first time, that uptake by AOX is widespread and quantitatively important to oxygen consumption in aquatic systems.Oxygen exchange by photosynthesis and respiration is the largest biogeochemical cycle in aquatic systems. In order to understand this cycle, it is necessary to know the gross rates of the major processes involved in oxygen production and uptake. Production of O 2 is known to occur in one process in photosystem II, but O 2 consumption in aquatic organisms is possible by several reactions. These include ordinary respiration through the cytochrome oxidase pathway, respiration by the alternative oxidase pathway, Mehler reaction, and photorespiration. The first two processes take place in light as well as in dark conditions, whereas the latter two occur only under illumination. Although the presence of the above mechanisms has been established in different studies, their quantitative importance in the overall O 2 uptake in aquatic systems is not well known, and it is necessary to assess their role in natural environments. In this respect, ordinary O 2 incubation methods, which are very useful for the assessment of photosynthetic production from light-and dark-incubation experiments (e.g., Williams and Purdie 1991), do not provide the necessary information. The main drawback of these methods is their inability to measure the rate of O 2 AcknowledgmentsWe thank Y. Geiffman and the Mekorot Watershed Unit for provision of wind data and extend special thanks to the Kinneret Limnological Laboratory skipper M. Hatab. We are grateful

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Bacterial carbon metabolism in the Amazon River system

Abstract: Bacterial abundance and production and community respiration were measured at several mainstem and tributary stations

Cited by 150 publications

References 32 publications

Relaciones entre las abundancias del bacterioplancton y del fitoplancton en tres ecosistemas lénticos de los Andes Colombianos

Relaciones entre las abundancias del bacterioplancton y del fitoplancton en tres ecosistemas lénticos de los Andes Colombianos

Bacterial growth and DOC consumption in a tropical coastal lagoon

Evaluation of community respiratory mechanisms with oxygen isotopes: A case study in Lake Kinneret

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