Seasonal pattern of ammonium (methylamine) uptake by phytoplankton in an oligotrophic lake

Parson, Marolyn J.; Parker, Barry

doi:10.1007/bf00008232

Cited by 8 publications

(2 citation statements)

References 55 publications

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“…Diatoms, MPB, and cyanophyceans are found to be dominating groups of primary producers in Chilka Lagoon during the period of study. It is well known that the diatoms and MPB utilise the available ammonia [5,26,27] in the water column for their growth during the photosynthetic activity and the amount of oxygen liberated in this process is proportional to their growth rates. Thus, the rate of oxygen liberation due to photosynthetic activity by diatoms and MPB can be given by [5] (32) (12) [ Phy Phy…”

Section: Development Of Biogeochemical Model For Do In Lake Chilkamentioning

confidence: 99%

Dynamics of Dissolved Oxygen in Relation to Saturation and Health of an Aquatic Body: A Case for Chilka Lagoon, India

Prasad

Pappula

Varma³

et al. 2014

Journal of Ecosystems

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Dissolved oxygen (DO) is essential for an aquatic ecosystem since it controls the biological productivity. Here, we propose a unidimensional dynamic model for DO by incorporating biological (photosynthesis, respiration, and mineralization), physical (atmospheric reaeration) and chemical (nitrification) processes so characteristic of shallow coastal water bodies. The analytical study of the proposed model is focussed on supersaturation and undersaturation of oxygen in the water body. The controllability of the ecosystem health has also been investigated. Model results indicate that, while undersaturation of oxygen is largely governed by nitrification and Net Ecosystem Metabolism (NEM), the supersaturation is controlled by photosynthetic activity. The model results are corroborated with observed data collected from Chilka lagoon, India. Subsequently, a biogeochemical model to study the DO variations in Chilka lagoon has been constructed. The model is properly calibrated and validated with observed data. Two independent sets of data (2004-2005 and 2005-2006) were used for model calibration and validation and Chi-square tests supported its robustness ( 2 = 0.982 and 0.987; < 0.05). The model was used to evaluate independently the influence of individual taxa (diatoms, microphytobenthos, and cyanophyceans) on DO variations. Simulations indicate the vital role of microphytobenthos in lagoon DO dynamics and the overall wellbeing.

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Section: Development Of Biogeochemical Model For Do In Lake Chilkamentioning

confidence: 99%

Dynamics of Dissolved Oxygen in Relation to Saturation and Health of an Aquatic Body: A Case for Chilka Lagoon, India

Prasad

Pappula

Varma³

et al. 2014

Journal of Ecosystems

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“…They found that ammonium was the preferred form for uptake and seasonal variations of uptake rates correlated with changes in chlorophyll a concentration, water temperature, and day length. Parson and Parker (1993), working in Mountain Lake, Virginia, suggested that seasonal changes in the phytoplankton community in oligotrophic systems may be the result of species affinity for available ammonium. The dynamics of the Ceratium hirundella population and the abundance of dinocysts in the plankton and sediments were studied in Lake Sempach, Switzerland (Pollingher et al, 1993).…”

Section: Aquatic Biotamentioning

confidence: 99%

Lake and reservoir management

Olem¹,

Simpson²

1994

Water Environment Research

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Relative importance of pico-, nano-, and microplankton to the productivity of Mountain Lake, Virginia

Beaty

Parker

1996

Hydrobiologia

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Studies of the relative importance of various phytoplankton size classes (pico-, nano-, micro-, and macro-) during thermal stratification at oligomesotrophic Mountain Lake, Giles County, Virginia were conducted from March through October 1994 . A detailed time-and depth-series study was conducted to compare 14 C-fixation rates in these phytoplankton size fractions . Data indicated that on average the microplankton were the most important size class in cell number and cell volume and contributed ,:J95% of the total primary productivity . The picoplankton ranked second in importance constituting ;z:5% of total primary productivity, whereas the relatively small numbers of nano-and macroplankton contributed little primary productivity . No obvious relationships were apparent among cell densities, cell volumes, and chlorophyll a values during late summer thermal stratification, possibly due to shifts in community structure at that time . The findings contrast with many other oligo-to mesotrophic ecosystems where the pico-and nanoplankton have demonstrated significantly greater importance, especially in summer .

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Seasonal pattern of ammonium (methylamine) uptake by phytoplankton in an oligotrophic lake

Cited by 8 publications

References 55 publications

Dynamics of Dissolved Oxygen in Relation to Saturation and Health of an Aquatic Body: A Case for Chilka Lagoon, India

Dynamics of Dissolved Oxygen in Relation to Saturation and Health of an Aquatic Body: A Case for Chilka Lagoon, India

Lake and reservoir management

Relative importance of pico-, nano-, and microplankton to the productivity of Mountain Lake, Virginia

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