A region within a biogeomorphological unit, primary biotopes refer to soft, hard or mixed substrate-based units and their associated biotic assemblages. These are modified by hydrological variables (wave exposure, turbidity, tidal effects and current speed) .
- Butler, A., P. Harris, et al. (2001). An Interim Bioregionalisation for the continental slope and deeper waters of the South-East Marine Region of Australia., National Oceans Office.