MATERIAL AND METHODS

The material used in this paper is from the open outer shelf at water depths of 134-145 m (samples 3112-3114, from approximately the top 1 cm of sediment, Murray 1985; collected with a grab, Murray and Murray 1987) and from shelf deeps at water depths of 167-218 m (samples MD6, MD7, SN6, with replicates a and b from two separate deployments of the multicorer, Murray, in press; MD = Muck Deep, SN = Stanton Deep). All were stained with rose Bengal to distinguish live (stained) from dead (unstained). In addition to staining in the outer chambers, many of the live foraminifera contained green protoplasm which partly remained unstained by rose Bengal, especially in the innermost chambers. Therefore, live tests were easily distinguished from empty dead ones (see Murray and Bowser 2000). All samples were washed over a 63 µm sieve. In order to concentrate the agglutinated forms, some samples were treated with dilute acid to remove the calcareous component following the method of Alve and Murray (1994). The residue is termed an acid treated assemblage (ATA) and is distinct from the original dead assemblage (ODA). The digital images in Figures 2-10 were taken on a Jeol 6400 SEM and captured on a PGT IMIX-PTS system.