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Spatial spring distribution of the copepod Eurytemora affinis (Copepoda,Calanoida) in a restoring estuary, the Scheldt (Belgium)

Mialet, Benoît and Azémar, Frédéric and Maris, Tom and Sossou, Claudine and Ruiz, Philippe and Lionard, Marie and Van Damme, Stefan and Lecerf, Antoine and Muylaert, Koenraad and Toumi, Néji and Meire, Patrick and Tackx, Micky Spatial spring distribution of the copepod Eurytemora affinis (Copepoda,Calanoida) in a restoring estuary, the Scheldt (Belgium). (2010) Estuarine, Coastal and Shelf Science, 88 (1). 116-124. ISSN 0272-7714

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Official URL: http://dx.doi.org/10.1016/j.ecss.2010.03.018

Abstract

The spatial spring distribution of Eurytemora affinis (adults and C5) in the Scheldt estuary (Belgium) brackish and freshwater reacheswas 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 (>4mg 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 < 1.3mg 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 abundancewas also observed in the Durme tributary. Our findings suggest the possibility to use E. affinis as an “indicator” species ofwaterquality, 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.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com/science/article/pii/S0272771410001150
HAL Id:hal-00994963
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Universiteit Antwerpen - UA (BELGIUM)
Other partners > Katholieke Universiteit Leuven - KU LEUVEN (BELGIUM)
Other partners > Université Laval (CANADA)
Laboratory name:
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Deposited By: Frédéric Azémar
Deposited On:22 May 2014 12:32

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