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Published online by Cambridge University Press: 05 December 2011
The distribution of Bathyporeia pilosa within a 30 m × 30 m grid was studied and related to the three major types of habitats constituting the grid. These were defined as Trough, Mound and Pool. B. pilosa was found to colonise the Trough sediments in significantly higher densities than the Mound or Pool sediments. The Pool deposits were found to be similar for 10 out of the 12 physical and chemical characteristics studied, differing only in permeability and penetrability. The coefficient of permeability of the Trough sediments was found to be five times that of the Mound sediments, and the penetrability was found to markedly higher in the permeable area than in that of low permeability: densities of B. pilosa were positively related, therefore, to permeability and penetrability. The causes of the variation between the habitats are considered and the importance of permeability and penetrability in the ecology of B. pilosa is discussed.