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Characteristic aspects of the tidal freshwater zone that affect aquatic primary production
Van Damme, S.; Struyf, E.; Maris, T.; Cox, T.; Meire, P. (2010). Characteristic aspects of the tidal freshwater zone that affect aquatic primary production, in: Van Damme, S. (2010). Water quality and the estuarine environment: Spatio temporal patterns and opportunities for restoration with emphasis on nitrogen removal = Waterkwaliteit en het estuarien milieu: Spatio-temporele patronen en mogelijkheden tot herstel met speciale aandacht voor stikstofverwijdering. pp. 15-44
In: Van Damme, S. (2010). Water quality and the estuarine environment: Spatio temporal patterns and opportunities for restoration with emphasis on nitrogen removal = Waterkwaliteit en het estuarien milieu: Spatio-temporele patronen en mogelijkheden tot herstel met speciale aandacht voor stikstofverwijdering. PhD Thesis. University Press Antwerp (UPA): Brussel. ISBN 978-90--5487-760-8. 186 pp., more

Also published as
  • Van Damme, S.; Struyf, E.; Maris, T.; Cox, T.; Meire, P. (2009). Characteristic aspects of the tidal freshwater zone that affect aquatic primary production, in: Barendregt, A. et al. (Ed.) (2009). Tidal freshwater wetlands. pp. 123-136, more

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Keywords
    Estuaries; Freshwater environments; Intertidal environment; Light; Nitrogen; Phosphorus; Phytoplankton; Primary production; River discharge; Silica; Suspended particulate matter; Turbidity; Belgium: Schelde; Marine; Brackish water; Fresh water

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Abstract
    Aquatic-based processes have not been well studied in tidal freshwater habitats even though they are
    diverse and highly variable systems. This chapter aims at a synthesis of the state of knowledge about aquatic
    primary production in tidal freshwater ecosystems and the main factors that control this process. Suspended
    matter is important in tidal freshwater habitats and it is affected by estuarine processes as well as land use and
    river discharge into the tidal freshwater zone from the catchment area. As a result, variation in the amount and
    quality of suspended matter influences the variability of light availability. The retention and transformation
    of nitrogen and phosphorus in the tidal freshwater zone is often intense and wetland vegetation has a major
    impact on the silica cycle within the tidal freshwater zone of estuaries. Although the primary producers follow a
    constantly changing equilibrium that is influenced by tide action and river discharge, they show characteristics
    that contrast with general ideas about primary producers in estuaries. The scarceness of data, together with
    weaknesses in methodology to measure or model primary production, is however in striking contrast with the
    complexity and importance of these neglected ecosystems. Nevertheless, within the tidal freshwater zone of the
    Scheldt estuary, two types of phytoplankton communities have been recorded, indicating that a typology for
    freshwater tidal systems is waiting to be revealed, taking into account e.g. residence time. The dynamic nature
    of tidal freshwater habitats implies that static, site-bound legislative protection measures tend to be less efficient
    than a functional approach. Comparative estuarine research offers a good opportunity to expand our knowledge
    about the ecological functioning of these important estuarine systems. As an example it is demonstrated here that it is possible to estimate historic suspended matter concentrations.

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