Diurnal rhythms in netplankton and nannoplankton assimilation ratios

Malone, TC

doi:10.1007/bf00368086

Cited by 69 publications

(22 citation statements)

References 16 publications

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“…One exception occurs: during the mixing 2006, r max and a present an afternoon maximum. Other studies have shown afternoon peaks in P B max (Malone 1971), but morning (Taguchi 1976) and midday maxima have also been frequently observed (Shimada 1958).…”

Section: Referencementioning

confidence: 86%

Diel cycles of the particulate beam attenuation coefficient under varying trophic conditions in the northwestern Mediterranean Sea: Observations and modeling

Gernez

Antoine

Huot

2010

Limnology & Oceanography

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The changes in shape, amplitude, and timing in the diel variability of the particulate beam attenuation coefficient (c p ) were investigated at 4 and 9 m during two seasonal cycles at an oceanic site in the northwestern Mediterranean Sea under contrasting physical and trophic situations. We observed a diel cycle in c p during the winter mixing of the water column, the development of the spring phytoplankton bloom, its collapse, and during the summer oligotrophy. The relative amplitude of the c p diel cycle was about 10-20% during winter mixing and summer oligotrophy and at least twice as large during the spring bloom. Diel c p minima generally occurred around sunrise and maxima a few hours before sunset. The specific particle rate of variation (r) was consistent over the diel cycle, with positive and negative values during daytime and nighttime, respectively. A striking feature of the r diel cycle was a morning maximum, i.e., before solar noon, which was successfully reproduced by a new model of particle assemblage growth rate based on three parameters: maximum growth rate, growth efficiency, and saturation irradiance. Each model parameter undergoes a diel cycle and shows a seasonal variation. A c pbased estimation of the particle net community production is computed from the measurements and model outputs. Results compare favorably with modeled primary production on the basis of continuous measurements of surface chlorophyll using fluorescence.

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Section: Referencementioning

confidence: 86%

Diel cycles of the particulate beam attenuation coefficient under varying trophic conditions in the northwestern Mediterranean Sea: Observations and modeling

Gernez

Antoine

Huot

2010

Limnology & Oceanography

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“…Studies of intertidal macroalgae have suggested that the inhibition of photosynthetic activity during exposure is linked to CO2, or other nutrient limitation (Thomas & Tregunna 1970, Quadir et al 1979, Schonbeck & Norton 1979. Because of their high surface/volume ratio, microalgae are generally less susceptible to nutrient limitation than macroalgae (Malone 1971). Yet, based on a simulation model, Ludden et al (1985) suggested that photosynthesis in exposed microalgal mats could b e limited by a reduced supply of CO2 which is less readily available from the atmosphere than from the water.…”

Section: Endogenous Versus Exogenous Control Of Photosynthetic Responsementioning

confidence: 99%

Environmental forcing versus endogenous control of photosynthesis in intertidal epilithic microalgae

Lamontagne¹,

Cardinal²,

Fortier³

1989

Mar. Ecol. Prog. Ser.

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Photoadaptation and photosynthetic capacity of an intertidal epilithic microflora were measured hourly over a period of 8 d. The algae were photoadapted to the dim light intensities experienced when submerged and showed little resistance to the extreme irradiances received when exposed. During neap tide when the community was permanently submerged, the photosynthetic response of algae collected hourly in the field followed a circad~an cycle. The endogenous control of this cycle was demonstrated by isolation experiments. During spring tide, photosynthet~c processes were photoinactivated at low tide when extreme irradiances reached the algae. These results lead to the general hypothesis that short-term variability in the photosynthetic capacity of intertidal epilithic microalgae is controlled primarily by endogenous phasing at neap tide and tidal forclng a t spring tide. Time senes of in situ production were reconstructed from solar irradiance measurements and hourly estimates of the parameters of the Photosynthesis-Irradiance curve. Despite the additional stress of low tide exposure, average daily production was comparable between spring and neap tides.

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confidence: 99%

Characterization of Photosynthetic Rhythms in Marine Dinoflagellates

Prézelin

Meeson²,

Sweeney³

1977

Plant Physiol.

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Diurnal periodicity in photosynthetic capacity (Pmax)2 has been documented during the last 20 years for several groups of algae and mixed populations of phytoplankton (6,12,13,21). In these organisms, maximal productivity is restricted to a short time each day, and thus the periodic nature of photosynthesis complicates field measurements of primary production. It ap pears clear from the extensive data now available that environmental variables significantly affect the magnitude of photosynthesis, but have little or no effect on the timing of the photosynthetic maximum each day. Recently, Stross and his co-workers (2, 22) demonstrated a coincidence between the daily maximum in photosynthesis in Euglena and that in the rates of phosphate uptake in phosphorous-sufficient cultures. It appears unlikely that phosphorous availability serves to regulate the timing of the photosynthetic periodicity, since the maximal phosphate uptake rates occurred 6 hr after that in photosynthesis, when cultures were phosphorous-limited (3).A few marine algae have been examined extensively for endogenous features which might account for their photosynthetic rhythm (4,8,9,14,18,19,21,(25)(26)(27)(28). Although several of these studies demonstrate a daily periodicity in various photosynthetic parameters correlated with the cell cycle of synchronized cultures (4,17,18,28), it is not clear that these organisms divide either once a day or in synchrony in natural populations.

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Diurnal rhythms in netplankton and nannoplankton assimilation ratios

Cited by 69 publications

References 16 publications

Diel cycles of the particulate beam attenuation coefficient under varying trophic conditions in the northwestern Mediterranean Sea: Observations and modeling

Diel cycles of the particulate beam attenuation coefficient under varying trophic conditions in the northwestern Mediterranean Sea: Observations and modeling

Environmental forcing versus endogenous control of photosynthesis in intertidal epilithic microalgae

Characterization of Photosynthetic Rhythms in Marine Dinoflagellates

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