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Zooplankton distribution across the brackish and freshwater zone of the Scheldt estuary
Azémar, F.; Fiers, F.; Tackx, M. (2002). Zooplankton distribution across the brackish and freshwater zone of the Scheldt estuary, in: ECSA Local Meeting: ecological structures and functions in the Scheldt Estuary: from past to future, Antwerp, Belgium October 7-10, 2002: abstract book. pp. 70
In: (2002). ECSA Local Meeting: Ecological structures and functions in the Scheldt Estuary: from past to future, Antwerp, Belgium October 7-10, 2002: abstract book. University of Antwerp: Antwerp. 73 + 1 cd-rom pp., more
Related to:
Azémar, F.; Fiers, F.; Tackx, M. (2004). Zooplankton distribution across the brackish and freshwater zone of the Scheldt estuary, in: Mees, J. et al. (Ed.) VLIZ Young Scientists' Day, Brugge, Belgium 5 March 2004: book of abstracts. VLIZ Special Publication, 17: pp. 33, more

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Document type: Summary

Keywords
    Abundance
    Aquatic communities > Plankton > Zooplankton
    Distribution
    Species diversity
    Water > Brackish water
    Water > Fresh water
    Acanthocyclops robustus (Sars G.O., 1863) [WoRMS]; Acartia tonsa Dana, 1849-1852 [WoRMS]; Brachionus calyciflorus Pallas, 1766 [WoRMS]; Calanoida [WoRMS]; Cyclopidae Rafinesque, 1815 [WoRMS]; Eurytemora affinis (Poppe, 1880) [WoRMS]; Rotifera [WoRMS]
    Belgium, Schelde R. [Marine Regions]

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Abstract
    Zooplankton diversity and distribution in the brackish and freshwater zone of the Scheldt is studied, as a continuation of preceeding studies carried out in the periods 1967-1669 and 1995-1997. We report on species diversity and abundancy of the zooplankters, collected on a monthly basis, in 20 sampling sites along the salinity gradient. Calanoids occur mainly in the brackish part, with Eurytemora affinis, Acartia tonsa and Eudiaptomus gracilis as the dominant species. In the freshwater region, rotifers (i.e. Brachionus calyciflorus, Keratella quadrata, among others), cyclopids (i.e. Acanthocyclops robustus, Cyclops vicinus) and cladocerans (Daphnia longispina, Bosmina longirostris...) are the dominant zooplankters. In addition, we report the presence of several species which were not detected in the former studies, such as the rotifers Brachionus leydigi var. quadratus, Notholca labis, Platyias quadricornis, Euchlanis dilatata, Gastropus hyptopus, Testudinella patina, Polyarthra dolichoptera and Trichotria sp. ; the cladocerans Acroperus harpae and Biapertura affinis, and the harparticoid Bryocamptus (Bryocamptus) minutus.

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