Ca-Mg index regulating phytoplanktonic particulate phosphorus concentration at the head of a river reservoir

1990 ◽  
Vol 24 (1) ◽  
pp. 158-161
Author(s):  
H. Kagawa
Keyword(s):  
Particulate Phosphorus ◽  
Phosphorus Concentration ◽  
River Reservoir

The Everglades Nutrient Removal Project test cells: STA optimization - status of the research at the north site

2001 ◽  
Vol 44 (11-12) ◽  
pp. 117-122 ◽  
Author(s):  
J. Majer Newman ◽  
T. Lynch
Keyword(s):  
Nutrient Removal ◽  
Organic Phosphorus ◽  
Inorganic Compounds ◽  
Monitoring Program ◽  
South Florida ◽  
Particulate Phosphorus ◽  
Phosphorus Concentration ◽  
The North ◽  
Test Cells ◽  
Oligotrophic Ecosystem

The Everglades is an oligotrophic ecosystem that is being adversely impacted by hydrologic changes and nutrient-rich runoff generated from urban and agricultural sources. The Stormwater Treatment Area (STA) Optimization Research and Monitoring program is mandated by the 1994 Everglades Forever Act and will assist the South Florida Water Management District in developing operational strategies that maximize performance of emergent macrophyte STAs. The primary objective of this research is to examine how hydrologic conditions may influence STA performance. The study was conducted in 0.2 ha, shallow, fully lined test cells located within the perimeter of the Everglades Nutrient Removal Project. Experiments were designed to examine the effect of increased and decreased hydraulic loading rate (HLR) on wetland performance and to determine, if possible, the HLR at which STA treatment fails to reduce outflow total phosphorus concentration to the interim target of 50 μg-P/L. To date, two HLR experiments have been completed at the north site. Preliminary data indicated at all HLRs tested that particulate phosphorus and dissolved organic phosphorus ratios remained virtually unchanged from inflow to outflow. The dissolved organic and particulate compounds within these test cells are extremely recalcitrant, and are not easily assimilated within the system. High HLRs may not result in detention times long enough to mineralize these forms into easily assimilated inorganic compounds, resulting in mean TP concentrations greater than 50 μg-P/L.

Simulation of the Contribution of Phosphorus-Containing Minerogenic Particles to Particulate Phosphorus Concentration in Cayuga Lake, New York

2016 ◽  
Vol 227 (11) ◽  
Author(s):  
Rakesh K. Gelda ◽  
Steven W. Effler ◽  
Anthony R. Prestigiacomo ◽  
Feng Peng ◽  
Martin T. Auer ◽  
...  
Keyword(s):  
New York ◽  
Particulate Phosphorus ◽  
Phosphorus Concentration ◽  
Cayuga Lake ◽  
Phosphorus Containing ◽  
Minerogenic Particles

Seasonal pattern and inferred phosphorus limitation of phytoplankton biomass in two tropical reservoirs in northern Australia

2000 ◽  
Vol 51 (1) ◽  
pp. 91 ◽  
Author(s):  
Simon A. Townsend
Keyword(s):  
Chlorophyll A ◽  
Total Phosphorus ◽  
Phytoplankton Biomass ◽  
Seasonal Pattern ◽  
Phosphorus Concentration ◽  
Wet Season ◽  
Temperate Lakes ◽  
Total Phosphorus Concentration ◽  
River Reservoir ◽  
Annual Range

Manton River Reservoir (MRR) and Darwin River Reservoir (DRR) are two small impoundments in the Australian wet/dry tropics. Over an eight-year period, chlorophyll a concentrations in the mixed layer averaged 3.6 µg L−1 in DRR, and 7.1 µg L−1 in MRR. The seasonal pattern of chlorophyll a at MRR was influenced by wet season wash-out (February average 4.8 µg L−1 ), and dry season destratification and nutrient enrichment of the surface waters (July average 8.4 mg L−1 ). In contrast, DRR exhibited near uniform chlorophyll a concentrations over the year. The seasonal patterns of DRR and MRR chlorophyll a are typical of tropical water bodies which tend to have a smaller annual range than temperate lakes, though this can be modified by significant wash-out. Empirical evidence suggests that the phytoplankton biomass of each reservoir is phosphorus limited, relative to the potential provided by other nutrients and light energy. This conclusion is based on a regression of total phosphorus and chlorophyll a concentrations of pooled DRR and MRR data (P < 0.001; r2 = 0.90), and the high total-nitrogen to total-phosphorus concentration ratios (by weight) of 50 and 37 in DRR and MRR, respectively. Annual chlorophyll a and total phosphorus concentrations for both reservoirs are in accord with the OECD regression for temperate lakes and reservoirs.

Size Structure of the Plankton Community Along the Trophic Gradient of Lake Memphremagog

1983 ◽  
Vol 40 (10) ◽  
pp. 1770-1778 ◽  
Author(s):  
Robert Henry Peters
Keyword(s):  
Trophic State ◽  
Size Structure ◽  
Geometric Mean ◽  
Mesh Size ◽  
Particulate Phosphorus ◽  
Phosphorus Concentration ◽  
Community Size ◽  
Millipore Filter ◽  
Size Classes ◽  
Filter Size

The size distribution of epilimnetic plankton at four sites of differing trophic state was examined from May 1977 to May 1978 to examine the applicability to lakes of Sheldon's hypothesis that logarithmically ordered size classes contain approximately constant concentrations of biomass. The plankton was sized by serial filtration through a series of screens of mesh size 102, 75, 55, 35, 20, and 10 μm and a 0.45-μm Millipore filter. Biomass in each fraction was measured as particulate phosphorus concentration. I tested the hypothesis by examining the fit of regressions of particulate P concentration in each sequential fraction against the logarithm of the geometric mean of the meshes used to delimit that fraction. Sheldon's hypothesis leads one to expect a linear relationship. In most cases this was found but exceptions were common, and some size classes contained significantly more or less P than the linear model (Sheldon's hypothesis) would suggest. Comparison of the amount of P in the size classes I studied with previous estimates of the biomass of zooplankton and fish suggest that larger organisms may also fit the relation. The slope and intercept of these regressions between biomass and filter size increase with lake trophic state. This may allow an approximate prediction of community size structure in other lakes based on measured or predicted concentrations of total phosphorus.

Characterisation of phosphorus in sediments from waste stabilization ponds

2000 ◽  
Vol 42 (10-11) ◽  
pp. 257-264 ◽  
Author(s):  
E. Gómez ◽  
J. Paing ◽  
C. Casellas ◽  
B. Picot
Keyword(s):  
Organic Phosphorus ◽  
Inorganic Phosphorus ◽  
Phosphorus Release ◽  
High Rate ◽  
Sediment Surface ◽  
Particulate Phosphorus ◽  
Phosphorus Concentration ◽  
Iron Hydroxides ◽  
Stabilization Ponds ◽  
Waste Stabilization

The waste stabilization pond (WSP) systems are useful for the treatment of wastewater. Despite a good knowledge of these systems, the dynamics of phosphorus elimination in these systems are not well known, especially concerning the forms of phosphorus in the sediment. Phosphorus dynamics were studied with data collected from the three stabilization ponds of the Mèze (France) system. A conceptual model based on theoretical considerations was developed, and applied to each pond. The percentage of observed variation described by these models ranged between 46.2% and 74.1%. The results showed that the principal variables affecting orthophosphate in WSP systems were phosphorus input and particulate phosphorus. When the model was applied to high rate algal pond (HRAP) data, the role of photosynthesis on pH increase and P precipitation was clear. Sediments sampled in the three facultative ponds were characterised with a fractionation scheme, currently used for sediments of natural aquatic ecosystems. Inorganic phosphorus accounted for 92-94% of total sediment phosphorus, with 57–59% bound to iron hydroxides and 33–37% bound to calcium. Surprisingly, organic phosphorus represented only between 6 and 8%. Polyphosphate was detected. Phosphorus concentration was greatest in the sediment from the third pond, where an aerobic layer at the sediment surface prevented phosphorus release.

Is a rainfall simulator useful for estimating phosphorus runoff from pastures — a question of scale-dependency?

2002 ◽  
Vol 42 (7) ◽  
pp. 953 ◽  
Author(s):  
P. S. Cornish ◽  
R. Hallissey ◽  
E. Hollinger
Keyword(s):  
Management Practices ◽  
Agricultural Land ◽  
Dairy Farm ◽  
Particulate Phosphorus ◽  
Phosphorus Concentration ◽  
Catchment Scale ◽  
Rainfall Simulator ◽  
Soluble Phosphorus ◽  
The Mean ◽  
Mean Concentration

Research on management practices that aim to reduce phosphorus in runoff from agricultural land has been hampered by the need to study large catchments over relatively long time periods to account for both the temporal and spatial effects of scale. The concentrations of pollutants such as phosphorus in runoff, similarly to suspended sediment, may diminish with increasing catchment scale. However, the runoff from well-covered dairy pastures contains predominantly soluble rather than particulate phosphorus. This paper examines the hypothesis that the concentration of soluble phosphorus in runoff from dairy pastures is insensitive to scale, and that small-plot rainfall simulators can be used to estimate concentrations of phosphorus in runoff at the farm or subcatchment scale.Over 2 years and 9 runoff events, the mean concentration of soluble phosphorus in runoff from a 140 ha dairy farm (0.95 mg/L) was not significantly different from a 4 ha representative subcatchment (paddock) within the dairy farm (0.66 mg/L). Relative concentrations from the 2 sources varied between events, depending on the duration of the runoff event. This variation was attributed to changes in the relative importance of different source areas as events progressed; runoff from the more distant parts of the larger catchment area, typically in higher positions in the landscape, apparently increased in importance in longer events.A hand-held rainfall simulator, with plots of only 1 m2, provided a quick, useful estimate of soluble phosphorus concentration in runoff. The mean concentration of soluble phosphorus in runoff from simulated rainfall at 9�locations in the 4 ha paddock (0.64 mg/L) was very similar to the value obtained from the paddock over a 2-year period (0.66 mg/L). We conclude that the concentration of soluble phosphorus in runoff from dairy pasture does depend on scale, and other variables, but the effect of scale was small for the catchment studied. A rainfall simulator may be used, with adequate replication, to estimate the soluble phosphorus concentrations in runoff that could be expected from dairy pastures over much larger areas.

Method application of optimal multi-parameter analysis to assess the distribution of water masses as an example of CTD data of the Barents Sea in summer 2017

2019 ◽  
pp. 38-51
Author(s):  
Valeriy G. Yakubenko ◽  
Anna L. Chultsova
Keyword(s):  
Barents Sea ◽  
Field Measurements ◽  
Structural Similarity ◽  
Water Masses ◽  
Parameter Analysis ◽  
Water Dynamics ◽  
Phosphorus Concentration ◽  
Nitrogen And Phosphorus ◽  
The Barents Sea ◽  
Expert Assessments

Identification of water masses in areas with complex water dynamics is a complex task, which is usually solved by the method of expert assessments. In this paper, it is proposed to use a formal procedure based on the application of the method of optimal multiparametric analysis (OMP analysis). The data of field measurements obtained in the 68th cruise of the R/V “Academician Mstislav Keldysh” in the summer of 2017 in the Barents Sea on the distribution of temperature, salinity, oxygen, silicates, nitrogen, and phosphorus concentration are used as a data for research. A comparison of the results with data on the distribution of water masses in literature based on expert assessments (Oziel et al., 2017), allows us to conclude about their close structural similarity. Some differences are related to spatial and temporal shifts of measurements. This indicates the feasibility of using the OMP analysis technique in oceanological studies to obtain quantitative data on the spatial distribution of different water masses.

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