Abstract
Prior to 1986, before completion of a storm surge barrier, the average annual condition of mussels at culture plots in the Eastern Scheldt was better in the western part near the North Sea, than in the central part of the estuary. No such difference was observed in 1986 and 1987.
To predict the effects of the barrier on mussel culture, the condition of the mussels, which is an index of growth rate, is analysed and correlated with food sources for the period 1981–84. In the western and central part of the Eastern Scheldt, mussel condition correlates strongly with average annual primary production, but not with chlorophyll-a concentrations. This suggests a direct link between primary production and the growth of mussels.
In the western part of the estuary, the relation between condition and primary production has a less steep slope than in the central part. Import of food from the North Sea is suggested to act as an additional food source in the west of the Eastern Scheldt; hence the better condition values of the mussels, also in years with relatively low primary production.
The storm surge barrier reduces the water exchange with the North Sea. Reduced import of food and consequently lower mussel condition are expected in the western part of the estuary. Preliminary data from 1987 confirm this prediction.
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Smaal, A.C., van Stralen, M.R. (1990). Average annual growth and condition of mussels as a function of food source. In: McLusky, D.S., de Jonge, V.N., Pomfret, J. (eds) North Sea—Estuaries Interactions. Developments in Hydrobiology, vol 55. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2000-2_14
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DOI: https://doi.org/10.1007/978-94-009-2000-2_14
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