Chapter

Cold-Water Corals and Ecosystems

Part of the series Erlangen Earth Conference Series pp 503-514

Deep-water coral development as a function of hydrodynamics and surface productivity around the submarine banks of the Rockall Trough, NE Atlantic

  • Martin WhiteAffiliated withDepartment of Earth and Ocean Sciences, National University of Ireland
  • , Christian MohnAffiliated withDepartment of Earth and Ocean Sciences, National University of Ireland
  • , Henko de StigterAffiliated withKoninklijk Nederlands Instituut voor Onderzoek der Zee (NIOZ)
  • , Gareth MottramAffiliated withRemote Sensing Group, Plymouth Marine Laboratory

* Final gross prices may vary according to local VAT.

Get Access

Abstract

The dynamics that occur at the Porcupine Bank, Rockall Trough, are described in relation to the role the bank, and others like it, may play in the development of deep-water corals, such as Lophelia pertusa (L.), which occurs widely in the NE Atlantic. High productivity has been measured over the bank, and it appears that this productivity may be fuelled by an increase in nutrients available over the bank through winter convection which leaves dense, nutrient rich water on the bank. This dense water drains away slowly through the benthic boundary layer (BBL) providing a mechanism for downslope transport of organic material in the boundary layer. Processes such as rectification of diurnal tides and Taylor column formation generate closed circulation patterns around the bank and promote the retention of organic matter over the bank. Similar processes have been observed over other Rockall Trough banks, and the combination of these processes appear to promote the availability of food to the corals that inhabit the lower flanks of the banks, particularly on the coral-dominated carbonate mounds that also occur there.

Keywords

Physical oceanography benthic dynamics submarine banks cold-water Corals