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  • seasonal variations  (2)
  • Phosphate  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Seasonal variations of P compounds and their concentrations in two coastal lagoons (Herault, France) (1993)
    Springer
    Hydrobiologia 252 (1993), S. 45-59 
    Details
    ISSN: 1573-5117
    Keywords: phosphate ; sediment ; calcium ; iron ; coastal lagoons ; seasonal variations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This article concerns seasonal variations in the phosphate concentrations in two coastal lagoons near Montpellier (Mediterranean coast, France). The o-P concentration in the overlying water is highest during summer. The role of the sediment, particularly that of the different P fractions in the sediment, is discussed. Significant variations, especially in the FeOOH ≈ P fraction, occur. For both Tot-Psed and the Fe00H≈P fraction a gradient from surface to bottom is observed, as well as a distinct decrease in the FeOOH≈P fraction in the surface sediments during summer and autumn. Variations in the FeOOH≈P fraction appear to be compensated by variations in the CaC03≈P fraction. These variations appear to be determined by the ferric hydroxide concentration. This compound represents only a small part (maximally 15%) of the total iron in the sediments and is related to the dissolved oxygen content of the immediately overlying water. Besides the fractions o-P, Fe(OOH)≈P, a large part of the CaC03≈P fraction is potentially bioavailable. A large proportion of the Tot-Psed is therefore bioavailable.[/p]
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000127
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Phosphate mobility at the sediment–water interface of a Mediterranean lagoon (etang du Méjean), seasonal phosphate variation (1998)
    Springer
    Hydrobiologia 373-374 (1998), S. 203-216 
    Details
    ISSN: 1573-5117
    Keywords: Phosphate ; sediments ; coastal lagoon ; seasonal variations ; P fractions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Méjean Lagoon (France) is a confined, shallow system, 0.7 m in depth, with a surface area of 747 ha. Its sediments have a fine granulometry and are evenly distributed. The bathymetry and hydrodynamic behaviour of the basin create two zones with restricted exchanges between them. The western part (60% of the total surface area) is rich in dissolved phosphate (〉 mg l-1 in summer) and receives the majority of the phosphate (P) inputs from the watershed. The heavy macroalgal population consists of Gracilaria throughout the year and Ulva in summer and autumn. Phytoplankton levels sometimes reach 100 µg l-1 of chlorophyll a. The sediment-water phosphate exchange varies with environmental conditions and macroalgal growth. P mobility was studied on the basis of these characteristics. Algal biomass and water characteristics were measured at 15-day intervals throughout 1993. A seasonal study was conducted in 1994 to investigate which P fractions in the sediment were involved in the exchanges. The springtime rise in temperature reactivated decomposition of the macroalgal biomass that had accumulated in autumn. The redox potential (EH) fell as a result of this biological activity, leading to a decrease in the inorganic P fractions. This P release accounts for the higher P water concentrations observed in the lagoon in summer. The mobility of P fractions shows that the P stored in the sediments plays an active role in the dynamics of the overlying water. Seasonal variations in these fractions explain the patterns of P storage and mobilization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017092226396
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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