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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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Composition of estuarine macro-aggregates and their importance as concentration sites for micro-organisms in the Schelde estuary (Belgium) Fockedey, N. (2005). Composition of estuarine macro-aggregates and their importance as concentration sites for micro-organisms in the Schelde estuary (Belgium), in: Fockedey, N. Dieet en groei van Neomysis integer (Leach, 1814) (Crustacea, Mysidacea) = Diet and growth of Neomysis integer (Leach, 1814) (Crustacea, Mysidacea). pp. 189-199 In: Fockedey, N. (2005). Dieet en groei van Neomysis integer (Leach, 1814) (Crustacea, Mysidacea) = Diet and growth of Neomysis integer (Leach, 1814) (Crustacea, Mysidacea). PhD Thesis. Universiteit Gent. Vakgroep Biologie, sectie Mariene Biologie: Gent. X, 297 pp., meer

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Beschikbaar in	Auteur
VLIZ: Open Marine Archive 97972 [ download pdf ]

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Trefwoorden

Microorganisms Microorganisms > Bacteria Resources > Natural resources > Mineral resources > Mineral deposits > Seabed deposits > Aggregates Water bodies > Coastal waters > Coastal landforms > Coastal inlets > Estuaries België, Zeeschelde [Marine Regions] Marien/Kust

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Auteur		Top
Fockedey, N., meer

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Abstract

In November 1997 and June 1998, the composition of estuarine macro-aggregates in the Schelde estuary was investigated at 4 sites situated in the estuarine turbidity maximum. The flocculation process was simulated in vitro using rolling cylinders and macro-aggregates were separated from the surrounding water by sedimentation and decantation. 47 - 90 % of the suspended particulate matter, 29 - 67 % of the particulate organic carbon, 6 - 57 % of the chlorophyll a, 1 - 39 % of the bacteria, 5 - 14 % of the heterotrophic nanoflagellates and 5 - 25% of the ciliates in the water column were found to occur in association with the macro-aggregates. The fraction of total chlorophyll a that was associated with the macro-aggregates was at all sites lower in June when compared to November. The fraction of total bacteria that was associated with the macro-aggregates was highest in the freshwater tidal reaches and tended to decrease in downstream direction. Concentrations of bacteria, heterotrophic nanoflagellates and ciliates in the macro-aggregates were generally one to two orders of magnitude higher than in the surrounding water. Despite high concentrations of micro-organisms in the macro-aggregates, living biomass contributed at most to 3.2 % of total organic carbon of the macro-aggregates.

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