The Benthic foraminifera of the superficial sediments of several cores from the continental shelf of the north Cádiz Cu If have been analized. The distribution of these organisms shows a clear dependency to the water depth, distinguishing therefore, two different associations: the first one, an inner shelf of around 30 m depth) and the second one, a middle shelf of around 30 and 100 m depth. The transition between both associations is gradual, however, the disappearance of representative species at middle depth in the inner shelf is observed
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