On the sedimentology and the quantitative distribution of living foraminifera in the northern part of the Øresund

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Abstract
Sediment sampling in the Øresund revealed three zones in the depth interval from 6 to 27 m. Only moderately sorted sand is found at depths shallower than about 8 m, whereas well-sorted, fine sand is found from about 8 to about 19 m. In the deepest zone, below about 19 m, the sediment consists of fine sand with about 5 % silt and clay. The number of foraminifera species found in the two zones was low, whereas there were about three times as many in the deepest zone. It is suggested that this species distribution is controlled primarily by surface water of low salinity extending for longer periods to a depth of about 19 m. Densities were generally high in zones I and III but low in zone II. Is is thought that this is causally related to the degree of sorting of the sediments which again has an influence on the amount of available food.

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