Mariager Fjord (east coast of Jutland, Denmark) is a sill fjord with a central, permanently stratified basin. The upper mixed layer of the water column shows unusually high levels of primary production and phytoplankton throughout the summer season. Plankton blooms takes place at intervals of 2-3 weeks during the entire growth season although the external load of mineral nutrients is not very high. It is shown here that the high production results from overall low sedimentation rates and consequently long retention times of suspended particulate matter within the mixed layer. The low sinking velocities of suspended particles thus constitute the base for an efficient in situ re-mineralization and high regenerated production. Plankton community structure is therefore more important for system productivity than is the external nutrient load per se.
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