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

Katleen Robert, Daniel O.B. Jones, Aggeliki Georgiopoulou, Veerle A.I. Huvenne

Research output: Contribution to journalArticle

Abstract

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 remotely operated vehicle 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 photogrammetric reconstruction is further employed to examine whether wall complexity plays a role in promoting niche differentiation at very fine spatial scales. Results: The investigated walls showed differences in species assemblage both across walls and in comparison to flat sites, with the fine-scale heterogeneity engendered by walls allowing niche differentiation between closely related taxa. Main Conclusions: Vertical walls represent an important cold-water coral habitat with differences in species composition across walls within a region, illustrating their role in driving diversity patterns. Based on publicly available bathymetric datasets and a catalogue of broad-scale terrain features, globally over 8,000 features are likely to have vertical walls and cold-water corals, which highlight the need to consider deep-sea vertical habitats in current conservation efforts.

Original languageEnglish
JournalDiversity and Distributions
DOIs
Publication statusPublished - 13 Dec 2019

Bibliographical note

© 2019 The Authors. Diversity and Distributions Published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Keywords

  • cold-water corals
  • deep sea
  • distribution
  • diversity
  • niche differentiation
  • spatial patterns
  • vertical walls

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