Linking diel patterns in community respiration to bacterioplankton in an oligotrophic high‐elevation lake

Sadro, Steven; Nelson, Craig E.; Mélack, John M.

doi:10.4319/lo.2011.56.2.0540

Cited by 57 publications

(56 citation statements)

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“…Bacterial abundance has been shown to be a seasonal driver of NEP within the epilimnion of Emerald Lake (Sadro 2011) and is likely a driver of variation in NEP with depth as well. Although not measured in this study, bacterioplankton abundance is known to increase with increasing depth and Chl a concentration in Emerald Lake (Nelson 2008), a pattern of covariation that is also found in other lakes (Pace and Cole 1994), sometimes in response to the higher phytoplankton biomass of deep chlorophyll maxima (Cole et al 1988).…”

Section: Discussionmentioning

confidence: 99%

Depth‐integrated estimates of ecosystem metabolism in a high‐elevation lake (Emerald Lake, Sierra Nevada, California)

Sadro

Mélack

MacIntyre

2011

Limnology & Oceanography

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A series of vertical profiles of dissolved oxygen (DO) collected periodically over two consecutive ice-free seasons in an oligotrophic high-elevation lake (Emerald Lake, California) were used to investigate volumetric and areal rates of gross primary production (GPP), community respiration (CR), and net ecosystem production (NEP). Diel patterns in DO did not weaken with depth in this lake, where the entire 10-m water column was within the euphotic zone and where a deep chlorophyll a (Chl a) maximum was common during periods of thermal stratification. During stratification, both GPP and CR increased with depth, and heterotrophy (NEP , 0) tended to occur below the thermocline in association with higher Chl a and particulate matter concentrations. With the onset of autumn mixing each year, vertical gradients in metabolism weakened or disappeared and the entire water column was autotrophic. Net autotrophy over the growing season was confirmed using three methods of estimating whole-lake metabolism. During periods of stratification, flux across the thermocline, where eddy diffusivities were near molecular, was small (4% of total epilimnetic fluxes), while within the hypolimnion, where stratification was weaker and eddy diffusivities larger, fluxes between strata were more substantial (12% of total fluxes). For this lake and other small lakes with low wind speeds and Lake numbers near 10, mixing due to turbulence should be included in computations of metabolism within the hypolimnion. However, single-station measurements from within the epilimnion provide a reasonable estimate of seasonal metabolism, especially in the autumn when the lake is mixing on a diel basis.

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Section: Discussionmentioning

confidence: 99%

Depth‐integrated estimates of ecosystem metabolism in a high‐elevation lake (Emerald Lake, Sierra Nevada, California)

Sadro

Mélack

MacIntyre

2011

Limnology & Oceanography

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“…Petrucio and Barbosa (2004) demonstrated that bacterioplankton production may vary widely over the course of the day even in tropical lakes. On the other hand, Sadro et al (2011) reported higher respiration rates occurring at dusk and in the first part of the night, coupled directly to the diel production of organic carbon. Although changes in temporal patterns have been studied for several decades, much less is known about the diel changes in aquatic metabolism (Staehr and Sand-Jensen 2007;Marotta et al, 2012).…”

Section: Introductionmentioning

confidence: 93%

Determining the high variability of pCO2 and pO2 in the littoral zone of a subtropical coastal lake

2014

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Abstract:The aquatic metabolism comprises production and mineralization of organic matter through biological processes, such as primary production and respiration that can be estimated by gases concentration in the water column. Aim: The study aimed to assess the temporal variability of pCO 2 and pO 2 in the littoral zone of a subtropical coastal lake. Our hypotheses are i) high variability in meteorological conditions, such as temperature and light, drive the high variability in pCO 2 and pO 2 , and ii) the lake is permanently heterotrophic due to the low phosphorus concentration. Methods: We estimated pCO 2 from pH-alkalinity method, and pO 2 from dissolved oxygen concentration and water temperature measured in free-water during 24 hours in the autumn, winter, spring and summer. Results: Our findings showed that limnological variables had low temporal variability, while the meteorological variables and pCO 2 presented a high coefficient of variation, which is representative of each climatic season. In autumn and winter, it was recorded that the lake was supersaturated in CO 2 relative to the atmosphere, while in spring and summer CO 2 concentration was below the concentration found in the atmosphere. Over 24 hours, pCO 2 also showed high variability, with autumn presenting higher concentration during the night when compared to daytime. Water temperature and chlorophyll a were negatively correlated with pCO 2 , while pO 2 was positively correlated with wind and light. Conclusion: Agreeing with our first hypothesis, pCO 2 showed an expressive temporal variation in a subtropical lake associated to the high variability in meteorological conditions. On the other hand, our second hypothesis was not confirmed, since Peri Lake exported CO 2 to the atmosphere in some periods and in others, CO 2 was removed from the atmosphere.Keywords: subtropical, temporal variation, aquatic metabolism, meteorological conditions, seasonality.Resumo: O metabolismo aquático envolve os processos de produção e mineralização da matéria orgânica através de processos biológicos, tais como produção primária e respiração, que podem ser estimados através da concentração de gases na coluna d'água. Objetivo: O objetivo do presente estudo foi determinar a variabilidade temporal da pCO 2 e da pO 2 na zona litorânea de uma lagoa costeira subtropical, tendo como hipótese que i) a alta variabilidade nas condições meteorológicas, tais como temperatura e luz, direcionam a elevada variabilidade na pCO 2 e pO 2 e que ii) o ambiente é permanentemente heterotrófico devido à baixa concentração de fósforo. Métodos: Nós estimamos a pCO 2 através do método pH-alcalinidade, e a pO 2 a partir da concentração de oxigênio dissolvido e temperatura da água, medidos em água livre, durante 24 horas, no outono, inverno, primavera e verão. Resultados: Nossos resultados mostraram que as variáveis limnológicas amostradas apresentaram baixa variabilidade temporal, porém as variáveis meteorológicas e a pCO 2 apresentaram elevado coeficiente de variação, refletindo a variação...

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“…In contrast, heterothrophic organisms, especially bacteria, are expected to contribute to CRR higher than OCR because their metabolism is expected to be enhanced by the primary production taking place simultaneously (Pringault et al 2007(Pringault et al , 2009Sadro et al 2011). Hence, incubations in the lake, in which CRR was similar to OCR (Fig.…”

Section: Respiration In the Lightmentioning

confidence: 99%

Measurement of planktonic CO₂ respiration in the light

Carvalho

Eyre

2012

Limnology & Ocean Methods

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Respiration is an essential physiological process for all organisms and is a significant component of the global carbon cycle. However, CO 2 release rates in the light (CRR) by aquatic communities have seldom been measured directly; instead, the typical procedure is to measure oxygen consumption rates in the dark (OCR) and assume that they are approximately equivalent to CRR. Here we describe a method to measure CRR (and consequently gross photosynthesis rates) based on 13 C addition to incubation water in a closed system. We quantified planktonic CRR in situ in a lake, and also in laboratory experiments, where we tested the effects of temperature and irradiance on respiration rates. We also measured O 2 rates (respiration in the dark and net production in the light) to compare with those based on CO 2 , and found that in the lake, these rates were similar both for photosynthesis and respiration. In laboratory, however, they were very different, with CO 2 -based photosynthesis being higher, and CRR being lower than correspondent O 2 rates. These findings show that the usual approach of assuming similar OCR and CRR can be erroneous. We also found that higher temperature and irradiance caused higher CRR. The method was successful to provide CRR and photosynthetic measurements, but would greatly benefit from more precise techniques to measure the concentration of dissolved inorganic carbon in water.

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Linking diel patterns in community respiration to bacterioplankton in an oligotrophic high‐elevation lake

Cited by 57 publications

References 49 publications

Depth‐integrated estimates of ecosystem metabolism in a high‐elevation lake (Emerald Lake, Sierra Nevada, California)

Depth‐integrated estimates of ecosystem metabolism in a high‐elevation lake (Emerald Lake, Sierra Nevada, California)

Determining the high variability of pCO2 and pO2 in the littoral zone of a subtropical coastal lake

Measurement of planktonic CO₂ respiration in the light

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Linking diel patterns in community respiration to bacterioplankton in an oligotrophic high‐elevation lake

Cited by 57 publications

References 49 publications

Depth‐integrated estimates of ecosystem metabolism in a high‐elevation lake (Emerald Lake, Sierra Nevada, California)

Depth‐integrated estimates of ecosystem metabolism in a high‐elevation lake (Emerald Lake, Sierra Nevada, California)

Determining the high variability of pCO2 and pO2 in the littoral zone of a subtropical coastal lake

Measurement of planktonic CO2 respiration in the light

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Measurement of planktonic CO₂ respiration in the light