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Over de invloed van enkele fysico-chemische faktoren op de faunistische rijkdom van de Noordoost-Vlaamse kreken
Gysels, H. (1972). Over de invloed van enkele fysico-chemische faktoren op de faunistische rijkdom van de Noordoost-Vlaamse kreken. Meded. Hydrobiol. Ver. 6(4).
In: Mededelingen van de Hydrobiologische Vereniging. Hydrobiologische Vereniging: Amsterdam. ISSN 2214-7063, more

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    VLIZ: Open Repository 274904 [ OMA ]

    Brackish water; Fresh water

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  • Gysels, H.

    In the north of the province of East-Flanders, extending from some 30 km north-west of Ghent to north-west of Antwerp, and also along the river Scheldt, there are a lot of inland waters called "kreken" (creeks). They are the remains of consecutive dike ruptures, some of which go back to medieval times.In general the water of the creeks is slightly brackish: the chloride content generally varies between 0.6 and 1.8 g Cl- per litre. One southern creek however, more distant from the river, may be considered as a freshwater biotope (0.14 g Cl- per litre), while on the other hand the north-west group is more brackish (2.2–3.65 g Cl- per litre).The creeks have well-buffered waters and are very productive of planktonic and other life. As the waters mostly are oligohaline, many fresh water species are present, but one should note that these are also euryhaline species, i.e. that they can withstand considerable changes in the salinity of the waters in which they live. Most characteristic, however, are the invertebrates which are more or less confined to the brackish biotopes.Although merely lifted from a preliminary inventory, the faunistic lists of this paper illustrate the considerable scientific importance of the creeks sufficiently. Physicochemical data obtained by water analysis and considerations upon their importance in relation with animal life are added; finally a plea is made for conservation of these unique natural sites.

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