Exchange potentials of phosphorus between sediments and water coupled to alkaline phosphatase activity and environmental factors in an oligo-mesotrophic reservoir

Mhamdi, B. Alaoui; Azzouzi, A.; Elloumi, Jannet; Ayadi, Habib; Mhamdi, M. Alaoui; Aleya, Lotfi

doi:10.1016/j.crvi.2007.02.009

Cited by 13 publications

(6 citation statements)

References 46 publications

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“…Microbial processes involved in utilization and enzymatic degradation of organic matter were strongly positively dependent on the intensity and rates of photosynthetic organic matter production and exudation that markedly increased along the eutrophication gradient of lakes (Chrost and Siuda 2006). In Sahela reservoir of Morocco, size-fractionated bacteria attached to dead organic matter together with algae and zooplankton contributed strongly (78%) to the total APA during September and October (Mhamdia et al 2007). Bacteria attached to the particles were the most active ones, and contributed 15-58 % to total extracellular enzyme activity in the water column.…”

Section: Discussionmentioning

confidence: 99%

Limitations of using extracellular alkaline phosphatase activities as a general indicator for describing P deficiency of phytoplankton in Chinese shallow lakes

2009

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Extracellular phosphatase can be produced by phytoplankton to utilize organic phosphorus under phosphorus (P) deficiency. However, there is a controversy about its use as an indicator of P deficiency in natural phytoplankton community inferred by such an "inductionrepression" mechanism. Size-fractionation of alkaline phosphatase activity (APA), soluble reactive phosphorus (SRP) concentration, algal density, and composition were determined in six Chinese shallow lakes ranking in gradient of trophic status, where a positive relationship between SRP concentration and algal density was observed. Enzymelabeled fluorescence (ELF) method was used to localize phosphatase on cell membrane of algae. The so-called algal APA that associated with coarser particle (>3.0 µm) accounted for the largest part of total APA. Within a lake with lower SRP concentration, the "induction-repression" mechanism held true. Contrastingly, both algal and total APA were positively related to SRP concentration based on the data across all study lakes with statistical significance, which may be explained firstly by algal composition. The lakes with higher SRP concentration were dominated by diatoms and green algae, while they easily produced extracellular phosphatases as evidenced by ELFA labeling. In parallel, the lakes with lower SRP concentration were dominated by cyanobacteria, while it was never ELFApositive; secondly, ELFA-positive dots or structures suggested that, in lakes with higher trophic status, attached bacteria or heterotrophic microorganisms could substantially contribute to extracellular phosphatases for hydrolyzing organophosphoric compounds but probably utilizing the organic moiety as an organic carbon source. This process simultaneously produces inorganic P, leading to the cooccurrence of high phosphate concentration and APA. So, the contributor of APA are complex, which may produce extracellular phosphatase species-specific or not exclusively for P nutrient and consequently make it difficult to normalize APA with the exact biomass estimators. Therefore, it is not reasonable to use APA, normalized or not, as a general indicator for describing P deficiency of phytoplankton in shallow lakes especially eutrophic ones.

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Section: Discussionmentioning

confidence: 99%

Limitations of using extracellular alkaline phosphatase activities as a general indicator for describing P deficiency of phytoplankton in Chinese shallow lakes

2009

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“…The various forms of phosphorus exist in the solid phase are more concentrated than in the liquid phase. This chemical element can be put into solution under specific physicochemical conditions and come fertilize the water column [2], [3]. Thus Nürnberg and Peters in 1984 [4], have shown that the sediment represent a significant source of phosphorus for the water of lakes.…”

Section: Introductionmentioning

confidence: 99%

Spatial distributions of forms of phosphorus of sediments by use of geographic information systems

Dehbi¹

2016

IOSRJEN

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-In Mediterranean countries to semi-arid climate like Morocco, the phenomenon of eutrophication of water bodies is posed with great acuity. The enrichment of water of retaining dam by nutrients, especially phosphorus compounds causing an accelerated growth of algae and higher forms of plant. This development leads to an undesirable disturbance to the equilibrium of organisms present in the water and leads a degradation of the water quality. So it seems particularly useful to seek to determine the various forms of phosphorus bound to sediment and of evaluate in particular the contents of bioavailable forms. The objective of this work is the study of spatial variations of the different forms of phosphorus sedimentary, such as inorganic forms {Fe (OOH)-P and CaCO 3 -P} and organic forms, in the retaining of Sidi Chahed dam (Morocco), as well as the elaboration of spatial distribution maps of these forms of phosphorus by the use of geographic information systems (GIS). The Thematic maps elaborated by the Geographical Information System (GIS), of the different forms of phosphorus characterizing the environmental condition of the retaining of Sidi Chahed dam, allows to have more accurate distribution of concentrations of forms of sedimentary phosphorus overlying the area of the retaining of dam. The results show that the sediment of plots whose the concentrations of Fe(OOH)-P and CaCO 3 -P are inversely proportional, that is that the high sediment concentrations of Fe(OOH)-P have less significant concentrations of CaCO 3 -P, and vice versa.

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“…As algae proliferate rapidly across large areas, they consume inorganic phosphorus from water, meaning that the supply of phosphorus is limited. Algae may then secrete alkaline phosphatase, which may promote the release of soluble organic phosphorus into the water (Mhamdi et al 2007). In addition, the mass death of Microcystis in autumn may lead to a dramatic increase in the supply of this fraction of organic phosphorus to the water body such that algal phosphorus may be regarded as a unique source of phosphorus in this season.…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal variations in algal phosphorus in Taihu Lake

Zhu

Wang

et al. 2021

Blue-Green Systems

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Phosphorus circulation in Taihu Lake has attracted extensive attention, but the contribution of Microcystis to phosphorus circulation in this area is unknown. In this study, the phosphorus concentrations in algal samples collected from the lake in 2015–2016 were determined in the laboratory. From the concentration data, the total quantity of algal phosphorus was calculated and the seasonal variations in algal phosphorus were examined. The results indicated that the intracellular phosphorus content of Microcystis in Taihu varied from 0.044 to 0.130 pg/cell and tended to be high in spring and low in summer. The total amount of algal phosphorus in Taihu Lake ranged between 7.78 and 97.32 t over the study period. Algal phosphorus only accounted for between 1.5 and 18.5% of the phosphorus stock in the water. Because Microcystis accumulated downwind, there was a tendency for the total phosphorus concentrations to be low in the east of the lake and high in the west of the lake. This new information about the spatial and temporal distribution of algal phosphorus contributes to our understanding of how phosphorus in Microcystis contributes to phosphorus circulation in Taihu Lake.

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Exchange potentials of phosphorus between sediments and water coupled to alkaline phosphatase activity and environmental factors in an oligo-mesotrophic reservoir

Cited by 13 publications

References 46 publications

Limitations of using extracellular alkaline phosphatase activities as a general indicator for describing P deficiency of phytoplankton in Chinese shallow lakes

Limitations of using extracellular alkaline phosphatase activities as a general indicator for describing P deficiency of phytoplankton in Chinese shallow lakes

Spatial distributions of forms of phosphorus of sediments by use of geographic information systems

Spatial and temporal variations in algal phosphorus in Taihu Lake

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