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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. 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. Is gerelateerd aan: 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.) Tidal freshwater wetlands. pp. 123-136, meer

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Beschikbaar in	Auteurs
VLIZ: Open access 283155 [ download pdf ]

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Trefwoorden

Aquatic communities > Plankton > Phytoplankton Belgium: Schelde Chemical compounds > Silicon compounds > Silica Chemical elements > Nonmetals > Atmospheric gases > Nitrogen Environments > Aquatic environment > Marine environment > Intertidal environment Freshwater environments Inflow > River discharge Particulates > Suspended particulate matter Phosphorus Primary production Properties > Physical properties > Turbidity Radiations > Electromagnetic radiation > Light Water bodies > Coastal waters > Coastal landforms > Coastal inlets > Estuaries Marien/Kust; Brak water; Zoet water

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Auteurs		Top
Van Damme, S. Struyf, E. Maris, T.	Cox, T. Meire, P.

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Abstract

Aquatic-based processes have not been well studied in tidal freshwater habitats even though they arediverse and highly variable systems. This chapter aims at a synthesis of the state of knowledge about aquaticprimary production in tidal freshwater ecosystems and the main factors that control this process. Suspendedmatter is important in tidal freshwater habitats and it is affected by estuarine processes as well as land use andriver discharge into the tidal freshwater zone from the catchment area. As a result, variation in the amount andquality of suspended matter influences the variability of light availability. The retention and transformationof nitrogen and phosphorus in the tidal freshwater zone is often intense and wetland vegetation has a majorimpact on the silica cycle within the tidal freshwater zone of estuaries. Although the primary producers follow aconstantly changing equilibrium that is influenced by tide action and river discharge, they show characteristicsthat contrast with general ideas about primary producers in estuaries. The scarceness of data, together withweaknesses in methodology to measure or model primary production, is however in striking contrast with thecomplexity and importance of these neglected ecosystems. Nevertheless, within the tidal freshwater zone of theScheldt estuary, two types of phytoplankton communities have been recorded, indicating that a typology forfreshwater tidal systems is waiting to be revealed, taking into account e.g. residence time. The dynamic natureof tidal freshwater habitats implies that static, site-bound legislative protection measures tend to be less efficientthan a functional approach. Comparative estuarine research offers a good opportunity to expand our knowledgeabout 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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