The tables in this section reflect the output of the workshop (October 2019) when the pressures from human activities were assessed for the period 2014 to 2018 for the region. The summary text below the tables elaborates on some of the points that were made at the workshop.
This pressure assessment uses the FeAST classification which includes two abrasion pressures: surface abrasion & sub-surface abrasion. Some expert groups combined these as a single pressure "surface & sub-surface abrasion" whilst others focussed on using surface abrasion alone, hence there is a slight difference in handling for some regions.
The ranking of the pressures in terms of impact is a relative exercise within each region, and is not a statement of their absolute impact. Detailed comparison between regions on the basis of these relative pressure assessments is therefore not advisable.
Siltation (or sedimentation) is the settling out or deposit of silt or sediments suspended in the water column to the sea bed. Changes relate to those over natural siltation and up to 5 cm (more than this depth is covered by different pressure), or where a light level of deposition is continuous (e.g. shellfish farming). Siltation of this level may completely smother smaller species and habitats, particularly sessile organisms. Effects can be hypoxia, physical difficulties in feeding, reproduction, reduction in photosynthesis and potentially death for more sensitive species.