Human Activities on the Deep Seafloor in the North East Atlantic: An Assessment of Spatial Extent

Background Environmental impacts of human activities on the deep seafloor are of increasing concern. While activities within waters shallower than 200 m have been the focus of previous assessments of anthropogenic impacts, no study has quantified the extent of individual activities or determined the relative severity of each type of impact in the deep sea. Methodology The OSPAR maritime area of the North East Atlantic was chosen for the study because it is considered to be one of the most heavily impacted by human activities. In addition, it was assumed data would be accessible and comprehensive. Using the available data we map and estimate the spatial extent of five major human activities in the North East Atlantic that impact the deep seafloor: submarine communication cables, marine scientific research, oil and gas industry, bottom trawling and the historical dumping of radioactive waste, munitions and chemical weapons. It was not possible to map military activities. The extent of each activity has been quantified for a single year, 2005. Principal Findings Human activities on the deep seafloor of the OSPAR area of the North Atlantic are significant but their footprints vary. Some activities have an immediate impact after which seafloor communities could re-establish, while others can continue to make an impact for many years and the impact could extend far beyond the physical disturbance. The spatial extent of waste disposal, telecommunication cables, the hydrocarbon industry and marine research activities is relatively small. The extent of bottom trawling is very significant and, even on the lowest possible estimates, is an order of magnitude greater than the total extent of all the other activities. Conclusions/Significance To meet future ecosystem-based management and governance objectives for the deep sea significant improvements are required in data collection and availability as well as a greater awareness of the relative impact of each human activity.

[1]  Jan Helge Fosså,et al.  Trawling damage to Northeast Atlantic ancient coral reefs , 2002, Proceedings of the Royal Society of London. Series B: Biological Sciences.

[2]  Carrie V. Kappel,et al.  A Global Map of Human Impact on Marine Ecosystems , 2008, Science.

[3]  S. Rogers,et al.  Human activities in UK offshore waters: an assessment of direct, physical pressure on the seabed , 2007 .

[4]  Mick Green,et al.  Submarine cables and the oceans : connecting the world , 2010 .

[5]  K. A. Bekiashev,et al.  North-East Atlantic Fisheries Commission (NEAFC) , 1981 .

[6]  Kristina M. Gjerde,et al.  Ecosystems and biodiversity in deep waters and high seas , 2006 .

[7]  Vincent Moreau,et al.  Deep-sea biodiversity and ecosystems - a scoping report on their socio-economy, management and governance. UNEP-WCMC Biodiversity Series 28 , 2007 .

[8]  M. Gianni.  High seas bottom trawl fisheries and their impacts on the biodiversity of vulnerable deep-sea ecosystems : options for international action , 2004 .

[9]  S. Trevisanut.  The Compliance Procedures and Mechanism of the 1996 Protocol to the 1972 London Convention on the Prevention of Marine Pollution by Dumping of Wastes and other Matter , 2009 .

[10]  C. Smith,et al.  The deep-sea floor ecosystem: current status and prospects of anthropogenic change by the year 2025 , 2003, Environmental Conservation.

[11]  Alan G. Stevenson,et al.  Drill cutting accumulations in the Northern and Central North Sea: a review of environmental interactions and chemical fate. , 2004, Marine pollution bulletin.

[12]  C. Gaillard.  Deep-Sea Biology. A natural history of organims at the deep-sea floor , 1992 .

[13]  H. Thiel,et al.  Anthropogenic impacts on the deep sea , 2003 .

[14]  Philippe Sands,et al.  Documents in European Community Environmental Law: Directive 2003/4/EC of the European Parliament and of the Council of 28 January 2003 on public access to environmental information and repealing Council Directive 90/313/EEC ( OJ L 41 14.02.2003 p. 26 ) , 2006 .

[15]  J. Hall‐Spencer,et al.  Preserving deep-sea natural heritage: Emerging issues in offshore conservation and management , 2007 .

[16]  A. Cropper.  Convention on Biological Diversity , 1993, Environmental Conservation.

[17]  S. J. de Groot.  Quantitative assessment of the development of the offshore oil and gas industry in the North Sea , 1996 .