Growth rate and quantum yield time response for a diatom to changing irradiances (energy and color)1

Morel, A.; Lazzara, Luigi; Gostan, Jacques

doi:10.4319/lo.1987.32.5.1066

Cited by 88 publications

(39 citation statements)

References 21 publications

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“…At increasing depth in the water column both the intensity and spectral characteristics of light change. In the open ocean, fol example, the blue light found near the base of the euphotic zone is a much better match for the absorption spectra of phytoplankton pigments than is white light (Morel -et al 1987). Consequently the decline in k, apparent in phytoplankton grown in dim white light due to factors such as packaging effects (Iturriaga et al 1988) may be more than offset by an increase due to the better match between the spectral characteristics of submarine light and photosynthetic pigments (Laws et al 1990).…”

Section: Discussionmentioning

confidence: 99%

A test of the assumptions and predictions of recent microalgal growth models with the marine phytoplankter Pavlova lutheri

Chalup

1990

Limnology & Oceanography

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The marine phytoplankter Pavlova lutheri was grown in both batch and continuous culture under various conditions of light and nitrate limitation in order to examine the accuracy of certain assumptions and predictions of microalgal growth models. The N : C ratio of the cells was found to be uniquely related to their relative growth rate. There was no unique relationship, however, between Chl a : C ratios and relative growth rate. Optical absorption coefficients normalized to Chl a were negatively correlated with relative growth rate at a fixed irradiance and positively correlated with irradiance at a fixed relative growth rate when light intensity was varied with neutral-density filters. Quantum yields were positively correlated with relative growth rate at a fixed irradiance and negatively correlated with irradiance at a fixed relative growth rate. Certain parameters or combinations of parameters which appear in nutrient-saturated growth models were found to be either independent of relative growth rate at a fixed irradiance or uniquely correlated with relative growth rate. This discovery facilitates extension of nutrient-saturated growth models to nutrientlimited conditions.

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Section: Discussionmentioning

confidence: 99%

A test of the assumptions and predictions of recent microalgal growth models with the marine phytoplankter Pavlova lutheri

Chalup

1990

Limnology & Oceanography

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“…Spectrally weighted absorption (S,, 400 to 700 nm, m2 mg-l) of the different types of absorption spectra, a,, ZAF [termed a(h) in Eq. (7); Table l ] were calculated according to Morel et al (1987): For t h~s computation, spectral irradiance for blue oceanic waters and green coastal waters at 20 m depth were taken from Johnsen et al (1992). Theoretical white light (similar response from 400 to 700 nm) was used for comparison of 'weighted' absorption between measured unpacked and packed (= in vivo) and modeled unpacked and packed absorption using the pigmentand chromoprotein models.…”

Section: Methodsmentioning

confidence: 99%

Chromoprotein- and pigment-dependent modeling of spectral light absorption in two dinoflagellates, Prorocentrum minimum and Heterocapsa pygmaea

Johnsen¹,

Nelson²,

Jovine³

et al. 1994

Mar. Ecol. Prog. Ser.

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Pigment-and chromoprotein-dependent spectral models, designed to accurately reconstruct whole cell absorption spectra for photosynthetic dinofldgellates, were assessed. Measured spectral absorption properties (400 to 700 nm) included signatures from whole cells, dispersed thylakoid fragments (unpacked absorption), isolated chromoproteins and individual pigments from high (500 pm01 m-2 S-') and low (35 pm01 m-2 S") light-adapted cells of the dinoflagellates Prorocentrum minimum and Heterocapsa pygmaea grown in continuous light at 15 OC. For model verification, we also developed a procedure to measure unpackaged cell absorption, free of solvent and light-scattering effects. Maximum measured chl a-spec~f~c absorption at 675 nm appears to be closer to 0.027 than a predicted value of 0.0203 m2 mg-l chl a based on absorption from chl a in 90% acetone. The percent fractional absorption of 'in vivo' welght-specific absorption coefficients of individual pigments relative to total weighted absorption (all pigments) was estimated to indicate the light-harvesting capabilities of the different pigments as a function of photoadaptive status and water color. Correspondingly, the weighted absorption of each pigment fraction has been estimated in theoretical white light and in 'clearest' green coastal and blue oceanic waters. Independent of water color, peridinin was by far the most important light-harvesting pigment, followed by chl c2 and chl a. The photoprotective diadinoxanthin absorbed most efficiently in the blue part of the visible spectrum. Results indicate that the chromoprotein model (1) overcame spectral distortions inherent in more general pigment-dependent models and, when combined with corrections for pigment packaging effects. (2) provided accurate spectral estimates of in vivo absorption coefficents and (3) worked equally well for dinoflagellate species with or without the major light-harvesting peridinin-chlorophyll-protein complex, PCP. Findings are discussed in the context of modeling of blo-optical characteristics in dinoflagellates, their photoecology and implications for the in situ optical monitoring of red tides.

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“…Therefore, the role of phytoplankton and related detritus material in absorbing and backscattering light is of fundamental interest (Kirk 1983), an interest that has grown recently (Kishino et al 1986;Schofield et al 1991;Bricaud et al 1995). Light-absorption spectra of phytoplankton populations are needed to develop bio-optical models and, together with photoirradiance curves, to determine the quantum yield of photosynthesis, which is an important component of primary production models (Bannister 1974;Bannister and Wiedemann 1984;Kishino et al 1986;Morel et al 1987;Lewis et al 1988).…”

mentioning

confidence: 99%

Determining the contribution of pigments and the nonalgal fractions to total absorption: Toward an improved algorithm

Varela

Arbones

et al. 1998

Limnology & Oceanography

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Three methods that estimate the algal and nonalgal contributions to the total particulate matter light absorption were analyzed against the experimental Kishino method in a wide variety of environments. We found that one method gave better overall correlations and slopes closer to 1 than did the other methods, but the method overestimated the nonalgal fraction when the nonalgal absorption to total particulate matter absorption proportion in the sample was low. As a result, a correction is suggested and results are compared with those of the other methods, showing that the combined use of the original algorithm and the correction do configure a suitable basis for differentiating the algal and nonalgal fractions using as input only the total particulate light absorption data.

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Growth rate and quantum yield time response for a diatom to changing irradiances (energy and color)1

Abstract: The growth rate of a diatom (Chaetoceros protubcram) was followed during transfers from moderate to higher or lower irradianccs (PAR) with differing spectral compositions ("white,"

Cited by 88 publications

References 21 publications

A test of the assumptions and predictions of recent microalgal growth models with the marine phytoplankter Pavlova lutheri

A test of the assumptions and predictions of recent microalgal growth models with the marine phytoplankter Pavlova lutheri

Chromoprotein- and pigment-dependent modeling of spectral light absorption in two dinoflagellates, Prorocentrum minimum and Heterocapsa pygmaea

Determining the contribution of pigments and the nonalgal fractions to total absorption: Toward an improved algorithm

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