Exposure times in rapid light curves affect photosynthetic parameters in algae

Ihnken, Sven; Eggert, Anja; Beardall, John

doi:10.1016/j.aquabot.2010.07.002

Cited by 56 publications

(33 citation statements)

References 58 publications

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“…Ihnken et al (2010) found up to 3-fold increases in maximal relative ETRs with increasing light step duration, from 10 to 90 s. In this study, a 30 s step was used after a preliminary survey, with values ranging from 10 s to 1.5 min. These results showed that time steps < 30 s usually led to lower ETRs, suggesting incomplete recovery of reaction centers, whereas time steps > 30 s did not lead to large ETR changes.…”

Section: Oxygen Incubations Vs Pam Fluorescencementioning

confidence: 96%

Laminaria hyperborea photosynthesis-irradiance relationship measured by oxygen production and pulse-amplitude-modulated chlorophyll fluorometry

Duarte¹,

Ramos²,

Calado³

et al. 2013

Aquat. Biol.

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Information about photosynthesis−irradiance (P−I) relationships is crucial in many primary production studies. This is frequently obtained using incubation experiments, which may not simulate in situ conditions where algae are adjusting their photosynthetic systems to permanent light variations. There has been increasing interest in pulse-amplitude-modulated (PAM) chlorophyll fluorometry-which measures instantaneous photosynthetic response -particularly in the use of rapid light curves (RLCs) to minimize the confounding effects of light acclimation encountered with traditional 'steady-state' light curves (SSLC). However, there is still a lack of information about how oxygen SSLC curves and estimations from fluorescence P−I curves are related. The present study addresses some of these topics, using Laminaria hyperborea. The objectives of this study were to (1) determine the effect of light sequence (increasing or decreasing) in the estimation of P−I parameters, (2) characterize the daily patterns of P−I curve parameters, (3) compare oxygen and fluorescence P−I parameters and (4) evaluate the possibility of converting fluorescence P−I parameters into oxygen production measurements. Results showed that light sequence had no significant effect on P−I parameters (fluorescence and oxygen) and that P−I curves exhibited considerable differences over the day (F-ratio analysis). Fluorescence SSLCs and RLCs were good oxygen production predictors only at sub-saturating irradiances, when significant linear relationships were obtained with results from oxygen incubations. Thus care should be taken when interpreting PAM fluorescence gross production estimations from higher light intensities. KEY WORDS: Photosynthesis−irradiance relationship · Oxygen incubations · Steady-state light curves · Rapid light curvesResale or republication not permitted without written consent of the publisher Aquat Biol 19: 29-44, 2013 cesses. This dynamic nature may preclude the usage of static P−I relationships, i.e. equations with fixed parameters; instead, these 'parameters' may have to be treated as variables.The P−I relationship of macroalgae is frequently studied using incubation experiments, where algae are kept under different light levels for a period long enough to observe significant changes in dissolved oxygen within the incubation vessels, as a result of photosynthesis and respiration. Physiologically 'oriented' experiments may use small pieces of macroalgae (e.g. Franklin & Badger 2001), allowing more experimental control of light-intensity conditions and, possibly, reducing error variance among replicates if pieces of similar shape, size and cut from the same part of the thallus are used. These experiments provide useful physiological information due to high control of experimental conditions. However, if the main interest is simulating in situ photosynthesis, within the scope of an ecologically 'oriented' study, it is probably more appropriate to use whole organisms in experiments with proper replication, to account for ...

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Section: Oxygen Incubations Vs Pam Fluorescencementioning

confidence: 96%

Laminaria hyperborea photosynthesis-irradiance relationship measured by oxygen production and pulse-amplitude-modulated chlorophyll fluorometry

Duarte¹,

Ramos²,

Calado³

et al. 2013

Aquat. Biol.

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“…Climate change factors include changes in absolute value of temperature, range, and characteristics [43]. The most immediate reaction to climate change is expected to be a change in river and lake water temperatures [19,34,35], since temperatures in water are in close equilibrium with air temperature, and freshwater temperatures will rise as the air temperature increases [36]. Under the framework of climate change, increasing air temperature will influence the water temperature, as well as the physical and chemical properties of water including water pH, salinity, solubility, and diffusion rates.…”

Section: Direct and Indirect Effects Of Increasing Temperaturementioning

confidence: 99%

“…However, the overall trend of radiation at the Earthʹ' surface is increasing. Solar radiation as the primary source of energy in most aquatic and terrestrial ecosystems is also an important power source of photosynthesis for the aquatic organism, and the limiting factor for the growth of phytoplankton [19]. A case study showed that solar radiation could have negative impacts on many aquatic species and aquatic ecosystems in lakes, rivers, marshes, oceans, etc.…”

Section: Solar Radiation Effectmentioning

confidence: 99%

“…Recent reports have also indicated that there was a direct correlation between the distribution of algae and the intensity of illumination at different depths [61,62]. Radiation penetrates into significant depths of aquatic systems, affecting freshwater systems from major biomass producers (phytoplankton) to consumers Solar radiation as the primary source of energy in most aquatic and terrestrial ecosystems is also an important power source of photosynthesis for the aquatic organism, and the limiting factor for the growth of phytoplankton [19]. A case study showed that solar radiation could have negative impacts on many aquatic species and aquatic ecosystems in lakes, rivers, marshes, oceans, etc.…”

Section: Solar Radiation Effectmentioning

confidence: 99%

“…Temporal and spatial variation in solar radiation determines the efficiency of photosynthesis, which influences the rate of production of plants, and therefore the survival of animals. Under normal circumstances, sufficient sunlight provides good conditions for the growth of algae, leading to an increase in water temperature, thus further influencing the growth of phytoplankton and increasing the risk of water eutrophication [19]. However, there is a maximum growth rate of algae, beyond which further increase of light makes the growth rate of algae decrease.…”

Section: Solar Radiation Effectmentioning

confidence: 99%

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The Potential Impacts of Climate Change Factors on Freshwater Eutrophication: Implications for Research and Countermeasures of Water Management in China

et al. 2016

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Abstract:Water eutrophication has become one of the most serious aquatic environmental problems around the world. More and more research has indicated climate change as a major natural factor that will lead to the acceleration of eutrophication in rivers and lakes. However, understanding the mechanism of climate change's effect on water eutrophication is difficult due to the uncertainties caused by its complex, non-linear process. There is considerable uncertainty about the magnitude of future temperature changes, and how these will drive eutrophication in water bodies at regional scales under the effect of human activities. This review collects the existing international and domestic literature from the last 10 years, discussing the most sensitive factors of climate change (i.e., temperature, precipitation, wind, and solar radiation) and analyzing their interaction with water eutrophication. Case studies of serious eutrophication and algal bloom problems in China are discussed to further demonstrate the conclusion. Finally, adaptation countermeasures and related implications are proposed in order to foster the development of sustainability strategies for water management in China.

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Scale‐Up of flat plate photobioreactors considering diffuse and direct light characteristics

Quinn

Turner²,

Bradley

2011

Biotech & Bioengineering

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This study investigates the scaling of photobioreactor productivity based on the growth of Nannochloropsis salina incorporating the effects of direct and diffuse light. The scaling and optimization of photobioreactor geometry was analyzed by determining the growth response of a small-scale system designed to represent a core sample of a large-scale photobioreactor. The small-scale test apparatus was operated at a variety of light intensities on a batch time scale to generate a photosynthetic irradiance (PI) growth dataset, ultimately used to inform a PI growth model. The validation of the scalability of the PI growth model to predict productivity in large-scale systems was done by comparison with experimental growth data collected from two geometrically different large-scale photobioreactors operated at a variety of light intensities. For direct comparison, the small-scale and large-scale experimental systems presented were operated similarly and in such a way to incorporate cultivation relevant time scales, light intensities, mixing, and nutrient loads. Validation of the scalability of the PI growth model enables the critical evaluation of different photobioreactor geometries and design optimization incorporating growth effects from diffuse and direct light. Discussion focuses on the application of the PI growth model to assess the effect of diffuse light growth compared to direct light growth for the evaluation of photobioreactors followed by the use of the model for photobioreactor geometry optimization on the metric of areal productivity.

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Exposure times in rapid light curves affect photosynthetic parameters in algae

Cited by 56 publications

References 58 publications

Laminaria hyperborea photosynthesis-irradiance relationship measured by oxygen production and pulse-amplitude-modulated chlorophyll fluorometry

Laminaria hyperborea photosynthesis-irradiance relationship measured by oxygen production and pulse-amplitude-modulated chlorophyll fluorometry

The Potential Impacts of Climate Change Factors on Freshwater Eutrophication: Implications for Research and Countermeasures of Water Management in China

Scale‐Up of flat plate photobioreactors considering diffuse and direct light characteristics

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