Kinetics of oxygenic photosynthesis in planktonic algae

Megard, Robert O.; Tonkyn, David W.; Senft, W. Herbert

doi:10.1093/plankt/6.2.325

Cited by 86 publications

(61 citation statements)

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“…Counting efficiency was determined by the external standard method. C-assimilation rates were fitted according to Megard et al (1984). For standard nomenclature of photosynthetic parameters see Sakshaug et al (1997).…”

Section: Methodsmentioning

confidence: 99%

Photosynthetic activity of natural microphytobenthos populations measured by fluorescence (PAM) and 14C-tracer methods:a comparison

Hartig¹,

Wolfstein²,

Lippemeier³

et al. 1998

Mar. Ecol. Prog. Ser.

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PAM (pulse-amplitude-modulated) fluorescence measurements of motile microphytobenthic algae were carried out in June 1996 at Sylt, Germany. Compansons between "C-based and fluorescence-based production rates were made. A very high correlation between 14C-and fluorescence-based production rates was found for maximal production rates (P, , values). I4C-based maximal production rates var~ed during the study penod between 0.65 and 1.7 mg C mg chl a-' h-', comparable to variations of P,,, measured with the fluorescence-based method. For other photosynthetic parameters [a (maximum light utilization coefficient). Ek (light saturation index), E,,, (light intensity at which P, , , , , is reached)], differences between the 2 methods were much larger. Highest carbon quantum yields ( @, , , ) (m01 C m01 quanta-' absorbed) were obtained at low irradiances. Considering the whole range of investigated carbon quantum yields, we found that initially these values decreased at low to moderate irradiances without a concomitant decline of the actual photochemical efficiency (F,' -F)/F,,' (Fand F,'. m~nimal and maximai iiuoresce~lct' signals in :he !igh!) Therefcre, e high !ine~rit)r between the actual photochemical efficiency and the carbon quantum yield could only be observed up to values of 0.018 m01 C m01 quanta-' This is different to higher plants, for which linearity can be observed up to carbon quantum yields of 0.042 m01 C m01 quanta-' It was shown that, for the calculation of the overall production rates based on the fluorescence method, it is necessary to carefully measure the mean specific absorption coefficient (a') of the algae. Unless this is achieved. PAM measurements cannot be used to calculate absolute production rates.

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Section: Methodsmentioning

confidence: 99%

Photosynthetic activity of natural microphytobenthos populations measured by fluorescence (PAM) and 14C-tracer methods:a comparison

Hartig¹,

Wolfstein²,

Lippemeier³

et al. 1998

Mar. Ecol. Prog. Ser.

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“…All photosynthetic rate data (02 and 14C) were normalised to chlorophyll a. Photosynthetic efficiency ( a ) and the light saturation constant (Ek) were calculated according to Megard et al (1984). Physical and chlorophyll measurements.…”

Section: Methodsmentioning

confidence: 99%

The Photosynthetic Light Dispensation System:application to microphytobenthic primary production measurements

Wolfstein¹,

Hartig²

1998

Mar. Ecol. Prog. Ser.

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Measurements of rnicrophytobenthos primary production were carried out in the German Wadden Sea in order to test the application of a 'Photosynthetic Light Dispensation System', which was originally developed for photosynthetic research of higher plants. A description of the computercontrolled system, consisting mainly of a subunit providing the irradiance (photosynthetically active radiation, PAR), and a subunit equipped with a Clark-type electrode for measuring oxygen production and respiration processes is given. The system allows rapid and reproducible measurements of photosynthesis-irradiance (P-E) curves at light modes predetermined by the computer and simple, rapid data analysis. Additionally, P-E curves obtained by this system were compared to those received by simultaneously conducted 'T measurements. Primary production measured by the oxygen method was on average 2.00 times higher than the values obtained by the "C method. Production rates varied between 1.7 and 4.1 mg C mg chl a-' h-' with a mean of 2.75 mg C mg chl a-' h-'

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“…Therefore there is no variable in this equation for nutrient limitation. P max has been estimated as a temperature dependent variable and is consistent with the Arrhenius equation [38]:…”

Section: Oxygen Production By Photosynthesismentioning

confidence: 71%

A Deterministic Model for Predicting Hourly Dissolved Oxygen Change: Development and Application to a Shallow Eutrophic Lake

2016

Water

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Predicting dissolved oxygen (DO) change at a high frequency in water bodies is useful for water quality management. In this study, we developed a deterministic model that can predict hourly DO change in a water body with high frequency weather parameters. The study was conducted during August 2008-July 2009 in a eutrophic shallow lake in Louisiana, USA. An environment monitoring buoy was deployed to record DO, water temperature and chlorophyll-a concentration at 15-min intervals, and hourly weather data including air temperature, precipitation, wind speed, relative humidity, and solar radiation were gathered from a nearby weather station. These data formed a foundation for developing a DO model that predicts rapid change of source and sink components including photosynthesis, re-aeration, respiration, and oxygen consumption by sediments. We then applied the model to a studied shallow lake that is widely representative of lake water conditions in the subtropical southern United States. Overall, the model successfully simulated high-time fluctuation of DO in the studied lake, showing good predictability for extreme algal bloom events. However, a knowledge gap still exists in accurately quantifying oxygen source produced by photosynthesis in high frequency DO modeling.

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Kinetics of oxygenic photosynthesis in planktonic algae

Cited by 86 publications

References 0 publications

Photosynthetic activity of natural microphytobenthos populations measured by fluorescence (PAM) and 14C-tracer methods:a comparison

Photosynthetic activity of natural microphytobenthos populations measured by fluorescence (PAM) and 14C-tracer methods:a comparison

The Photosynthetic Light Dispensation System:application to microphytobenthic primary production measurements

A Deterministic Model for Predicting Hourly Dissolved Oxygen Change: Development and Application to a Shallow Eutrophic Lake

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