Can chlorophyll fluorescence be used to estimate the rate of photosynthetic electron transport within microphytobenthic biofilms?

Perkins, Rupert; Oxborough, Kevin; Hanlon, A. R. M.; Underwood, Graham J. C.; Baker, Neil R.

doi:10.3354/meps228047

Cited by 87 publications

(117 citation statements)

References 33 publications

(32 reference statements)

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“…Vertical migration has also been considered as a unique form of behavioural regulation of light exposure and absorption (Admiraal, 1984;Perkins et al, 2002;Underwood, 2002;Seroˆdio et al, 2005). Furthermore, benthic microalgae are known to carry out what is known as 'micro-migration' , which consists of the continuous replacement of cells within the top layers of the sediment (Perkins et al, 2002;Underwood et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, downward migration may help microalgae to avoid grazers (Buffan-Dubau & Carman, 2000), minimize resuspension into the water column (Kingston, 1999b), promote access to carbon or nutrients Kromkamp et al, 1998;Kingston, 1999bKingston, , 2002, or facilitate sexual reproduction (Saburova & Polikarpov, 2003). Vertical migration has also been considered as a unique form of behavioural regulation of light exposure and absorption (Admiraal, 1984;Perkins et al, 2002;Underwood, 2002;Seroˆdio et al, 2005). Furthermore, benthic microalgae are known to carry out what is known as 'micro-migration' , which consists of the continuous replacement of cells within the top layers of the sediment (Perkins et al, 2002;Underwood et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Changes in the taxonomic composition of the biofilm could explain the differences in migratory behaviour that might have occurred within each fortnightly cycle. Alternatively, these results could be due to micromigration, where microalgae migrate downwards to avoid locally unfavourable conditions and are replaced by others coming from subsurface layers Perkins et al, 2002;Underwood et al, 2005;Perkins et al, 2010). This process is expected when biofilms are exposed to high light for prolonged periods, causing limitation or photoinhibition of photosynthesis, and could explain the maintenance of high biomass levels at the surface during exposure to high light levels.…”

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confidence: 99%

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Endogenous versus environmental control of vertical migration by intertidal benthic microalgae

Coelho

Vieira

Serôdio

2011

European Journal of Phycology

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The vertical migratory behaviour of estuarine microphytobenthos, i.e. the biofilm-forming microalgae inhabiting intertidal sediments, is probably a significant factor for their success in this extreme and unstable environment. The present work aimed to assess the relative role of endogenous versus environmental control of benthic microalgal vertical migratory behaviour. This was done by comparing the patterns of vertical migration in undisturbed sediment samples kept under constant conditions of darkness and low light with those in ambient light conditions, by measuring the changes in the surface microalgal biomass during daytime low-tide periods. The results showed that the formation of a biofilm was a two-phase process. It began with a relatively small accumulation of cells at the surface, starting hours before the beginning of the light period and endogenously driven. However, the full formation of the biofilm required exposure to light by the expected beginning of the photoperiod, which further promoted upward migration and accelerated the cell accumulation at the surface. In the absence of light, upward migration was interrupted and the incipient biofilm began to disaggregate. The relative importance of the endogenously controlled behaviour varied during the spring-neap tidal cycle, reaching a maximum on those days when low tide occurred in the middle of the day, suggesting its entrainment by the duration of light exposure on previous days. The regulation of the surface cell concentration during daytime low tides was found to be strongly dependent on exogenous factors, particularly irradiance. The spontaneous disaggregation of the biofilm shortly before the end of the low-tide period (due to tidal flood or sunset), both under constant as well as ambient light conditions, suggested the presence of an endogenously controlled positive geotaxis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Endogenous versus environmental control of vertical migration by intertidal benthic microalgae

Coelho

Vieira

Serôdio

2011

European Journal of Phycology

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“…Irradiance has been estimated to contribute between 30% and 60% of the variability in production, with biomass explaining 30-40% (MacIntyre et al 1996). However, patterns in microphytobenthic primary productivity have also been recorded to occur independently of light and light history (Miles and Sundbäck 2000;Perkins et al 2001).…”

mentioning

confidence: 99%

“…MPB attain this high level of ecological significance despite inhabiting estuarine sediments with a photic zone of only ϳ400 m in depth (Consalvey 2002); limited periods of light exposure (Serôdio and Catarino 1999); and highly variable, and potentially stressful, temperatures and irradiances (Blanchard and Guarini 1996;Perkins et al 2001;. Microphytobenthic biofilms show little evidence of photoinhibition and maintain high rates of production across a range of environmental conditions.…”

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confidence: 99%

Patterns in microphytobenthic primary productivity: Species‐specific variation inmigratory rhythms and photosynthetic efficiency in mixed‐species biofilms

Underwood

Perkins

Consalvey

et al. 2005

Limnology & Oceanography

126

150

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The importance of temporal changes in the vertical distribution of microphytobenthic algae on the overall functioning of intertidal biofilms were investigated with low-temperature scanning electron microscopy and high-resolution single-cell fluorescence imaging of photosystem II efficiency (estimated by the fluorescence parameter F / Ј q F ) in intact cores maintained in tidal mesocosms. Early morning biofilms consisted of smaller naviculoid and Ј m nitzschioid taxa or euglenoid species. By midday, Gyrosigma balticum and Pleurosigma angulatum were dominant. Some taxa (e.g., Plagiotropis vitrea) disappeared from surface layers after midday. Species composition continued to change toward the end of the photoperiod, with G. balticum dominating in diatom-rich biofilms. In Euglena-rich biofilms, initial dense surface films of euglenids became progressively dominated by smaller diatoms. F /F (mea-Ј Ј q m sured at a photosynthetically active photon flux density (PPFD) of 220 mol m Ϫ2 s Ϫ1) of individual cells of all taxa declined significantly after midday, but increased toward dusk. There were significant differences in F /F between Ј Ј q m species, particularly after midday. F /F versus irradiance curves and relative electron transport rate (rETR max ) Ј Ј q m showed higher efficiencies and rETR max for euglenids, whereas G. balticum, Nitzschia dubia, and small Nitzschia sp. were shade-adapted with low values of F /F m Ј, rETR max , and E sat . G. balticum, P. vitrea, and N. dubia showed Ј q rapid vertical migration away from the surface with increasing irradiance. Euglenids, P. angulatum, and N. dubia exhibited their highest rETR max values at midday. E sat for algal cells was between 500 and 600 mol m Ϫ2 s Ϫ1 , except for N. dubia and small Nitzschia sp., which had an E sat of 300 mol m Ϫ2 s Ϫ1. Differences in behavioral and photophysiological traits between microphytobenthic taxa could be a form of niche separation and need to be incorporated into conceptual models of daily patterns of production in intertidal biofilms.

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Diatom Motility: Mechanisms, Control and Adaptive Value

Serôdio

2021

Diatom Gliding Motility

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Can chlorophyll fluorescence be used to estimate the rate of photosynthetic electron transport within microphytobenthic biofilms?

Cited by 87 publications

References 33 publications

Endogenous versus environmental control of vertical migration by intertidal benthic microalgae

Endogenous versus environmental control of vertical migration by intertidal benthic microalgae

Patterns in microphytobenthic primary productivity: Species‐specific variation inmigratory rhythms and photosynthetic efficiency in mixed‐species biofilms

Diatom Motility: Mechanisms, Control and Adaptive Value

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