Internal nutrient loading in a eutrophic lake, reflected in seasonal variations of some sediment parameters

Boström, Bengt; Ahlgren, Ingemar; Bell, Russell T.

doi:10.1080/03680770.1983.11897884

Cited by 32 publications

(34 citation statements)

References 7 publications

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“…BostrOm et al (1982) presented an 'idealized' distribution of Psed fractions in which Org-P was estimated at approximately 16%. Recent work has shown the presence of large quantities of Org-P, accounting for more than 50% of Tot-P in most sediments (BostrOm et al, 1985;De Groot & Golterman, 1990;De Groot, 1990;De Groot & Fabre, 1993;Moutin et al, 1993), values which correspond to the values of Org-P found in soils (Stevenson, 1982;Tate, 1985). De Groot & Golterman (1990) and De Groot (1990) showed that a general underestimation of Org-P occurred, because of hydrolysis of Org-P by insufficiently specific extractants used in the extraction of inorganic P-fractions from the sediment.…”

Section: Introductionmentioning

confidence: 95%

On the presence of organic phosphate in some Camargue sediments: evidence for the importance of phytate

1993

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The organic phosphate pool of some Camargue sediments (South of France) was studied, after removal of inorganic phosphate, with Ca-NTA/dithionite (Fe bound phosphate) and Na-EDTA (Ca bound phosphate). The organic phosphate was divided into an acid soluble organic phosphate fraction (ASOP) and a residual organic phosphate fraction (ROP). The extraction of organic matter with 2.0 M NaOH (90 C) from ROP yielded considerable quantities of Org-P. In this extract the presence of phytate (inositol hexa phosphate) could be demonstrated using phytase to hydrolyse the phytate. Phytate was shown to account for a considerable part of organic phosphate in sediments of freshwater marsh sediments as well as in the sediment of the brackish/salt water lake 'Etang de Vaccares'. In laboratory experiments phytate was found to precipitate with all poly-valent cations tested. Furthermore, phytate was found to be strongly adsorbed onto Fe(OOH), which may explain its accumulation and its stability in sediments.Considerable quantities of ASOP were found; the chemical stucture of this pool remains unknown.Abbreviations: In this paper the standard abbreviations are used, as suggested by the editor (see page vi):chem-Xphys (inorg-Pdiss, Tot-Nsed)Additional abbreviations used: ASOP = acid soluble organic phosphate CaCO 3 ; P = calcium bound phosphateFe(OOH) P = iron bound phosphate NaOHextr-P = phosphate extracted with NaOH (90 C) after ASOP extraction.Phyt-P = phytate bound phosphate ROP = residual organic phosphate 118

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Section: Introductionmentioning

confidence: 95%

On the presence of organic phosphate in some Camargue sediments: evidence for the importance of phytate

1993

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“…After thorough mixing, the suspension was examined using an epifluorescence (blue excitation; BP 450-490 nm) microscope. Fluorescing algae were easily detected among sediment particles and measurements were made according to their closest geometrical shape (Bostrom et al, 1985). As only live algae fluoresced red, this method was extremely useful in separating live algal cells from dead algal frustules.…”

Section: Determination Of Algal Biomassmentioning

confidence: 99%

“…Biomass of algae was determined by measuring the volume of each alga and assuming a density of 1.0 g cm -3 (Bostrom et al, 1985). A sediment sample (1 g) was weighed into a screw-cap tube and 0.5% NaCl (20 ml) was added.…”

Section: Determination Of Algal Biomassmentioning

confidence: 99%

Biological, chemical and physical factors influencing the seasonal change of polysaccharide concentration in irrigation-channel sediment

Zoysa

Ragusa

1995

J Appl Phycol

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Variation of polysaccharide concentration in irrigation-channel sediment was determined concurrently with biological, chemical and physical factors influencing the benthic algal community. Phenol-sulphuric acid method was used to measure polysaccharide concentration. Polysaccharide concentration, biomass of benthic algae, and species composition changed spatially and temporally. Fluctuations of total suspended solid (TSS) concentration and exposure of channel bed to direct sunlight had major effects on algal growth and polysaccharide production. Polysaccharide concentration was correlated to chlorophyll a concentration (r = 0.73, P<0.001) and algal biomass (r= 0.57, P<0.001). Fragilaria construens and Aulacoseira (Melosira) italica were the most common diatoms in the benthic flora. Chlorophyll a concentration in the sediment showed a strong negative correlation (r= -0.99, P<0.001) with the seasonal variation of TSS concentration in channel water.The polysaccharides produced by benthic microorganisms play a major role in clogging channel bed and thereby reducing seepage from earthen irrigation channels. Correlations between polysaccharide concentration and chlorophyll a (and algal biomass) further indicate the importance of benthic algae for polysaccharide production. Since availability of light to the algal flora is critical for the production of polysaccharides, the effect of clogging can be maximized by exposing the channel bed to direct sunlight during non-irrigation period (winter).

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“…P bound to humic substances (Uhlmann et al 1990), P which had been accumulated in microorganisms (Waara et al 1993) or in special organic compounds such as phospholipids and polyphosphates (Baldwin 1996) were extracted. Boström et al (1985) described the NaOH-NRP fraction as the most dynamic fraction. For this reason, the P-fraction was not considered as part of refractory P in Lakes DUD and TIF.…”

Section: Calculations Of Benthic P-releasementioning

confidence: 99%

“…The loosely adsorbed fraction and the redox-sensitive fraction are particularly subject to mobilisation. Boström et al (1985) characterised the organically bound phosphorus as being the most dynamic fraction in the surface sediment. The characterisation of the bioavailable fractions is especially difficult.…”

Section: Introductionmentioning

confidence: 99%

Characterisation and quantification of phosphorus release from profundal bottom sediments in two dimictic lakes during summer stratification

Selig¹,

Schlungbaum²

2003

J Limnol

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Internal nutrient loading in a eutrophic lake, reflected in seasonal variations of some sediment parameters

Cited by 32 publications

References 7 publications

On the presence of organic phosphate in some Camargue sediments: evidence for the importance of phytate

On the presence of organic phosphate in some Camargue sediments: evidence for the importance of phytate

Biological, chemical and physical factors influencing the seasonal change of polysaccharide concentration in irrigation-channel sediment

Characterisation and quantification of phosphorus release from profundal bottom sediments in two dimictic lakes during summer stratification

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