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Chapter 3 - Benthic HabitatsSouthern New EnglandTable 3-7. Physical factor values that correspond to ecological thresholds in the Southern New Englandsubregion.Bathymetry (m) Sediment Grain Size (mm) Seabed FormDepth (meters below sea level)050100150200250300350400450500550600650700750800850900950100010501100115012001250130013501400145015000-9 0-0.03 (mud and silt) Depression9-23 0.03- 0.16 (very fine sand) Mid Flat23-31 0.16-0.34 (fine sand) High Flat31-44 0.34 -0.36 (sand) Low Slope44-76 >=0.36 (medium and coarse sand) Sideslope76-139 Steep>=139Benthic Habitat Types: Southern New EnglandBH:109BH:200BH:25BH:390BH:316BH:230BH:873BH:229BH:2537BH:113BH:36BH:372BH:317BH:223BH:381BH:82BH:949BH:66BH:3BH:11BH:437BH:6BH:1BH:387Figure 3-17. Average depth and range of each benthic habitat type in the Southern New England subregion. Lines representtwo standard deviations above and below the mean. Habitat types with the same depths often differ from each other bysediment grain size or topographic location. Habitats with very large depth ranges are widespread associations unrelated to,or weakly correlated with, depth.Northwest Atlantic Marine Ecoregional Assessment • Phase 1 Report 3-35