Cold-water coral assemblages on vertical walls: distribution patterns from the Northeast Atlantic

Aim: In this study, we assess patterns of cold-water coral assemblages observed on deep-sea vertical walls. Similar to their shallow-water counterparts, vertical and overhanging walls in the deep sea can host highly diverse communities, but because of their geometry, these habitats are generally overlooked and remain poorly known.  These vertical habitats are however of particular interest, because they can protect vulnerable coral ecosystems from trawling activities.  As such, it is important to understand their ecology and assess their global importance. 

Location:  Vertical walls on complex geomorphic features, in particular walls of the Rockall Bank Slope Failure Escarpment, Whittard and Explorer Canyons, Northeast Atlantic.

Methods: Video analysis of ROV transects carried out at five sites is used to investigate differences in species composition and diversity across walls and to compare those to nearby cold-water coral sites on flat terrain.  A high-resolution photogrammetri...