SOME PHOTOSYNTHETIC CHARACTERISTICS OF A NATURALLY OCCURRING POPULATION OF <i>OSCILLATORIA AGARDHII</i> GOMONT1,2

Baker, Alan L.; Brook, A. J.; Klemer, Andrew R.

doi:10.4319/lo.1969.14.3.0327

Cited by 24 publications

(10 citation statements)

References 3 publications

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“…Samples of Planktothrix sp. taken from the metalimnion of Deming Lake, Minnesota, were almost completely photoinhibited when incubated near the water surface (Baker et al ., 1969∖). Cyanobacteria in the metalimnion may also benefit from nutrients present at higher concentrations than in the epilimnion.…”

Section: Discussionmentioning

confidence: 99%

Light‐dependent growth rate determines changes in the population of Planktothrix rubescens over the annual cycle in Lake Zürich, Switzerland

2002

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Summary• Analyses were made to determine which changes in a Lake Zürich population of Planktothrix rubescens were dependent on light-and temperature-dependent growth rates, and when growth was limited by the mixing depth.• Changes in vertical distribution of the cyanobacterium, determined weekly from August 1998 to September 1999, were related to growth increments calculated at 1-h time and 1-m depth intervals from values of irradiance, attenuance, temperature and biomass in the lake, using algorithms based on growth rates in culture.• Population biovolume varied annually from 1.2 to 120 cm 3 m −2 . During summer, modelled growth in the metalimnion matched the 50-fold population increase. Modelled growth exceeded the observed increase when Planktothrix was mixed into the nutrient-depleted epilimnion, suggesting nutrient limitation. The measured increase ceased when the mixed depth exceeded the critical depth for growth in autumn (Sverdrup's principle). Light limitation explained the gradual decrease of the population in winter. The steep decline in spring had other causes.• Population changes were largely determined by interactions of light and depth distribution; decreases in nutrient loading have had little impact on Planktothrix growth in Lake Zürich.

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Section: Discussionmentioning

confidence: 99%

Light‐dependent growth rate determines changes in the population of Planktothrix rubescens over the annual cycle in Lake Zürich, Switzerland

2002

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“…Under conditions of intense insolation, the rate of photosynthesis in algae present near the surface of the water falls (Baker et al, 1969;TalUng, 1971), Harris & Lott (1973) suggest that this reduction is due to an increase of the rate of photorespiration in the algae under conditions of high light intensity.…”

Section: Introductionmentioning

confidence: 96%

Some physiological‐biochemical characteristics of planktonic blue‐green algae during bloom formation in three Salopian meres

Röther¹,

Fay²

1979

Freshwater Biology

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Levels of cellular orthophosphate concentration, alkaline phosphatase activity, photosynthesis and nitrogenase activity of natural populations of blue-green algae collected during the summer of 1976 from the surface waters of three eutrophic lakes were determined under controlled conditions, Intracellular concentrations of surplus stored phosphorus remained high and alkaline phosphatase activity remained low during the formation and decline of the surface bloom, which indicated that available phosphorus does not become limiting to growth. In contrast, declining rates of nitrogenase activity and net photosynthesis were recorded, particularly in those blooms of shorter duration. An increase in numbers of bacteria during the summer may account for the observed fall of net photosynthetic rates, since gross rates did not change as markedly. There was appreciable nitrogenase activity preceeding and during the differentiation of akinetes, and the cellular C/N atomic ratio of sporulating populations was lower than in non-sporulating algae. It is suggested that the onset of sporulation in surface blooms is initiated by an imbalance of the normal vegetative growth of the algal cells and of their carbon and nitrogen metabolism.

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“…The possibility that this diurnal photosynthetic periodicity might vary with latitude has been suggested by Doty (t959) . Baker, Brook & Kleiner (1969) showed that the maximum productivity of a natural population of Oscillatoria agardhii was obtained at solar noon for 5 m depth and at twilight for surface waters . Malone (1971) in a study of nitrogen-limited oligotrophic waters of a tropical marine area, observed a 14 C assimilation maximum in the morning for nanoplankton and in the afternoon for `net' plankton .…”

Section: Introductionmentioning

confidence: 99%

Diurnal variation of phytoplankton in Loch Lomond

1978

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A study of diurnal variation over a 48 hour period was undertaken in July 1973 to ascertain the extent and timing of some major chemical, physical and biological variables in Loch Lomond . The phytoplankton population was dominated by the diatom Tabellaria jenestrata, with a maximum abundance between 04 .00 and o6.0o h in surface waters on both days . A distinct diurnal variation in cell numbers was also recorded . Chlorophyll a values also showed a regular pattern of variation with a single peak between ,o .oo and 14.oo h each day . Some chemical changes appeared to be a direct consequence of phytoplankton multiplication . Nitrate-nitrogen showed a decrease in concentration coinciding with the period of cell multiplication, whereas dissolved silica concentrations only fell on the completion of this process . Other common diatoms displayed less distinct patterns of variation although Fragilaria crotonensis attained its maximum abundance in surface waters . Considerable variation was recorded in the number of organisms and chlorophyll a levels at 25 cm intervals in the upper metre of the water column, with large variations in standing-crop and chemical parameters in the space of one hour . Diurnal oscillations in the position of the thermocline were recorded, with the thermal discontinuity being at its greatest depth in the early hours of the morning . The hypolimnion and thermocline regions clearly acted as a source of nutrient supply to the epilimnion . From this investigation it is apparent that for the proper understanding of diurnal variation a 24 hour study alone is insufficient and may give rise to misleading results .

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SOME PHOTOSYNTHETIC CHARACTERISTICS OF A NATURALLY OCCURRING POPULATION OF OSCILLATORIA AGARDHII GOMONT1,2

Cited by 24 publications

References 3 publications

Light‐dependent growth rate determines changes in the population of Planktothrix rubescens over the annual cycle in Lake Zürich, Switzerland

Light‐dependent growth rate determines changes in the population of Planktothrix rubescens over the annual cycle in Lake Zürich, Switzerland

Some physiological‐biochemical characteristics of planktonic blue‐green algae during bloom formation in three Salopian meres

Diurnal variation of phytoplankton in Loch Lomond

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