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Spatial spring distribution of the copepod Eurytemora affinis (Copepoda, Calanoida) in a restoring estuary, the Scheldt (Belgium) Mialet, B.; Azémar, F.; Maris, T.; Sossou, C.; Ruiz, P.; Lionard, M.; Van Damme, S.; Lecerf, A.; Muylaert, K.; Toumi, N.; Meire, P.; Tackx, M. (2010). Spatial spring distribution of the copepod Eurytemora affinis (Copepoda, Calanoida) in a restoring estuary, the Scheldt (Belgium). Est., Coast. and Shelf Sci. 88(1): 116-124. dx.doi.org/10.1016/j.ecss.2010.03.018 In: Estuarine, Coastal and Shelf Science. Academic Press: London; New York. ISSN 0272-7714; e-ISSN 1096-0015

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 212798 [ download pdf ]

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Trefwoorden

Distribution > Geographical distribution Eurytemora affinis (Poppe, 1880) [WoRMS]; Eurytemora affinis (Poppe, 1880) [WoRMS] ANE, Nederland, Westerschelde [Marine Regions] Marien/Kust; Brak water

Author keywords

distribution; estuaries; Eurytemora affinis; oxygen; restoration; zooplankton

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Auteurs		Top
Mialet, B. Azémar, F. Maris, T. Sossou, C.	Ruiz, P. Lionard, M. Van Damme, S. Lecerf, A.	Muylaert, K. Toumi, N. Meire, P. Tackx, M.

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Abstract

The spatial spring distribution of Eurytemora affinis (adults and C5) in the Scheldt estuary (Belgium) brackish and freshwater reaches was studied in between 1996 and 2007. The bulk of the E. affinis population being generally situated in the brackish water reach (salinity > 0.5); we studied which environmental factors are responsible for its recent sporadic occurrence in the freshwater estuarine reach. Using PLS analysis, it is shown that its presence upstream is limited by a sufficient oxygen concentration (>4 mg l-1) that is associated with temperature. Not only are the environmental conditions in the upstream zone important, but also the frequent presence of an O2 minimum zone in the mid-estuary (O2 min < 1.3 mg l-1) seems to block the movement of the downstream E. affinis population in an upstream direction. Occasionally, the bulk of the population is however situated upstream. During these periods, high E. affinis abundance was also observed in the Durme tributary. Our findings suggest the possibility to use E. affinis as an “indicator” species of water quality, but also lead us to stress the necessity to consider conditions over the entire estuary when studying restoration effects, not exclusively in the zone of interest.

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