Photoacclimation of <i>Scenedesmus protuberans</i> (Chlorophyceae) to fluctuating irradiances simulating vertical mixing

Flameling, Inez A.; Kromkamp, Jacco C.

doi:10.1093/plankt/19.8.1011

Cited by 35 publications

(34 citation statements)

References 28 publications

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“…An increase in this ratio implies exposure to larger fluctuations in photon irradiance. Eukaryotic algae such as green algae and diatoms seem better adapted to these fluctuations (Flameling and Kromkamp 1997;Nicklisch 1998;Litchman 2000), while many cyanobacteria seem more sensitive. A study by Ibelings et al (1994) in laboratory cultures showed that the cyanobacterium Microcystis was more sensitive to changes in photon irradiance than the green alga Scenedesmus.…”

Section: The Working Mechanismmentioning

confidence: 99%

Artificial mixing to control cyanobacterial blooms: a review

et al. 2015

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Artificial mixing has been used as a measure to prevent the growth of cyanobacteria in eutrophic lakes and reservoirs for many years. In this paper, we give an overview of studies that report on the results of this remedy. Generally, artificial mixing causes an increase in the oxygen content of the water, an increase in the temperature in the deep layers but a decrease in the upper layers, while the standing crop of phytoplankton (i.e. the chlorophyll content per m 2 ) often increases partly due to an increase in nutrients entrained from the hypolimnion or resuspended from the sediments. A change in composition from cyanobacterial dominance to green algae and diatoms can be observed if the imposed mixing is strong enough to keep the cyanobacteria entrained in the turbulent flow, the mixing is deep enough to limit light availability and the mixing devices are well distributed horizontally over the lake. Both models and experimental studies show that if phytoplankton is entrained in the turbulent flow and redistributed vertically over the entire depth, green algae and diatoms win the competition over (colonial) cyanobacteria due to a higher growth rate and reduced sedimentation losses. The advantage of buoyant cyanobacteria to float up to the illuminated upper layers is eradicated in a wellmixed system.

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Section: The Working Mechanismmentioning

confidence: 99%

Artificial mixing to control cyanobacterial blooms: a review

et al. 2015

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“…Kinzie et al (1998) noticed a higher induction of UVR-absorbing mycosporine-like amino acids in benthic communities (which were exposed to rather constant light intensities) than in planktonic organisms (which received fluctuating light). The importance of fluctuating light pulses of PAR was also pointed out by Flameling and Kromkamp (1997). They demonstrated for cultures of Scenedesmus protuberans that efficiency of photosynthesis decreases during (at the short-term) constant light conditions but remained high at fluctuating light of the same dosage.…”

Section: Discussionmentioning

confidence: 88%

Effects of UV on carbon assimilation of phytoplankton in a mixed water column

et al. 2001

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Carbon assimilation is usually measured at fairly constant light intensities. Under natural conditions, however, planktonic algae are moved through the water column and experience light of fluctuating intensity and spectral composition. They may cope with strong UV for a short residence in the upper water layer. In order to estimate the effects of UV on primary production of phytoplankton under conditions of turbulent mixing, we compared carbon assimilation and exudation of algae incubated in UV-transparent quartz and in UV-absorbing glass bottles which were moved through different water layers. Computer-controlled elevators were used to simulate mixing depths between 2 and 14 meters. Compared to the glass bottles, particulate C assimilation in the quartz bottles was reduced by 20 -30 % at mixing depths between 2 and 10 m. There was no significant difference between both types of incubation bottles at a mixing depth of 14 m. Exudation was enhanced by UV near the water surface (mixing depth up to 4 m) but not in the deep-mixed samples. Our results indicate serious damage of planktonic algae by UV even under conditions of vertical mixing if the euphotic zone exceeds the mixing depth. Depression was low for circulation through the whole euphotic zone and may disappear at even deeper mixing. Our results indicate lower photoinhibition per UV dosage at fluctuating than at constant light intensities. A model predicting inhibition as function of weighted irradiance spectra was adapted to describe wavelength dependent photoinhibition occurring at different mixing depths. The model results agreed very well with the inhibition rates measured under fluctuating light. These preliminary results are used to discuss the importance of UV on photosynthesis of planktonic algae in aquatic environments of different mixing depths and stabilities of stratification.

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“…Santo André lagoon is a shallow water ecosystem where phytoplankton cells are adapted to a more stable high light environment and probably less susceptible to photoinhibition. A decrease in the susceptibility to photoinhibition and enhanced photosynthetic capacity ( P max ) in response to increasing irradiance are common phenomena in planktonic algae (Richardson et al, 1983;Sukenik et al, 1990;Flameling and Kromkamp, 1997). In fact, irradiance at the bottom of the lagoon may present saturation or inhibiting values under full sunlight, as may be seen from Table 3.…”

Section: Discussionmentioning

confidence: 99%

“…However, it is known that vertical water movements produced by surface waves, internal waves, convection, Langmuir circulation, etc., impose a fluctuating light environment for phytoplankton. Phytoplanktonic cells meet the demands of this unstable light climate by exhibiting extreme plasticity in their photosynthetic apparatus to optimise the photosynthetic yield (Flameling and Kromkamp, 1997). Understanding vertical mixing processes (Falkowski and Wirick, 1981;Ravens et al, 2000) and consequent phytoplankton photoacclimation represented a major challenge in marine biology in the recent years (Denman and Gargett, 1983;Falkowski, 1984;Iriarte and Purdie, 1993;Dusenberry et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

“…Several workers studied the effect that fluctuations in the light field have on productivity (e.g., Gallegos and Platt, 1985;Mallin and Pearl, 1992;Franks and Marra, 1994;MacIntyre and Geider, 1996;Flameling and Kromkamp, 1997). One central issue related to the effect of light fluctuations on productivity is the occurrence of photoinhibition in response to high irradiance levels.…”

Section: Introductionmentioning

confidence: 99%

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The influence of incubation periods on photosynthesis–irradiance curves

Macedo

Duarte

Ferreira

2002

Journal of Experimental Marine Biology and Ecology

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In phytoplankton primary production studies, samples for the determination of photosynthesis versus irradiance relationship ( P -I) are usually incubated at several irradiance levels during a fixed time period, commonly 2 -4 h. However, it is not clear if the use of this fixed incubation time is appropriate to study the P -I relationship in any given ecosystem. The aim of this work was to study the influence of incubation time on the P -I relationship in natural phytoplankton populations from three different coastal ecosystems: an open coastal area, an estuary, and a coastal lagoon. Physical and chemical variables, phytoplankton biomass, species composition, and P -I curves were analysed. The results showed that, in the coastal area and in the estuary, P -I relationships were time dependent, whereas in the coastal lagoon different incubation periods produced the same P -I curve. An underestimation of daily primary production, ranging from 13% to 42.5%, was calculated when data from standard incubation times (2 -4 h) were used in ecosystems where P -I curves present a dynamic time-dependent behaviour. This work suggests that the response of the P -I curves to the incubation time varies with the characteristics of the ecosystem and is related to the light regime to which phytoplankton cells are adapted. D

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Photoacclimation of Scenedesmus protuberans (Chlorophyceae) to fluctuating irradiances simulating vertical mixing

Cited by 35 publications

References 28 publications

Artificial mixing to control cyanobacterial blooms: a review

Artificial mixing to control cyanobacterial blooms: a review

Effects of UV on carbon assimilation of phytoplankton in a mixed water column

The influence of incubation periods on photosynthesis–irradiance curves

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