Recovery of UK seabed habitats from benthic fishing and aggregate extraction — towards a cumulative impact assessment

Assessing cumulative impacts of multiple pressures on the marine environment can help inform management response. This requires understanding of the spatial and temporal distribution of human pressures and their impacts. Quantifying seabed recovery rates from 2 significant pressures in European waters, benthic fishing and aggregate extraction, is a significant step towards assessing sensitivity and cumulative impacts. Vessel monitoring system data were used to estimate the distribution and intensity of benthic fishing in UK (England and Wales) marine waters (2006 to 2007). Data were separated by towed bottom-fishing gears (scallop dredges, beam and otter trawls) and linked to habitat in a geographic information system. Recovery periods of seabed habitats were estimated by literature review, for gear types and fishing intensity. Recovery rates generally increased with sediment hardness, and habitats required longer periods of recovery from scallop dredging than from otter or beam trawling. Fishing pressure across the habitat-gear combinations was such that 80% of the bottom-fished area was estimated to be able to recover completely before repeat trawling, based on mean annual trawl frequencies. However, in 19% of the UK's bottomfished seabed, scallop dredging in sand and gravel and otter trawling in muddy sand and reef habitats occurred at frequencies that prevented full habitat recovery. In 2007, benthic fishing and aggregate extraction occurred together in an estimated 40 km2 (

[1]  I. Côté,et al.  Quantifying the evidence for ecological synergies. , 2008, Ecology letters.

[2]  L. Henry,et al.  Impacts of otter trawling on colonial epifaunal assemblages on a cobble bottom ecosystem on Western Bank (northwest Atlantic) , 2006 .

[3]  F. Storbeck,et al.  Micro-scale distribution of beam trawl effort in the southern North Sea between 1993 and 1996 in relation to the trawling frequency of the sea bed and the impact on benthic organisms , 1998 .

[4]  P. Carrothers.  Estimation of Trawl Door Spread from Wing Spread , 1980 .

[5]  Stephen J. Smith,et al.  Effects of experimental otter trawling on benthic assemblages on Western Bank, northwest Atlantic Ocean , 2006 .

[6]  D. P. Swain,et al.  Spatial distribution of catch and effort in a fishery for snow crab (Chionoecetes opilio): tests of predictions of the ideal free distribution , 2003 .

[7]  M. Kaiser,et al.  Changes in megafaunal benthic communities in different habitats after trawling disturbance , 1998 .

[8]  J. Collie,et al.  A quantitative analysis of fishing impacts on shelf-sea benthos. , 2000, The Journal of animal ecology.

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

[10]  C. Pitcher,et al.  A large scale BACI experiment to test the effects of prawn trawling on seabed biota in a closed area of the Great Barrier Reef Marine Park, Australia , 2009 .

[11]  J. Churchill.  The effect of commercial trawling on sediment resuspension and transport over the Middle Atlantic Bight continental shelf , 1989 .

[12]  M. Scheffer,et al.  Impacts of multiple stressors on biodiversity and ecosystem functioning: the role of species co‐tolerance , 2004 .

[13]  S. J. Hall.  Physical disturbance and marine benthic communities: life in unconsolidated sediments , 1994 .

[14]  Simon Jennings,et al.  Estimating high resolution trawl fishing effort from satellite-based vessel monitoring system data , 2007 .

[15]  M. Moore,et al.  Synergism and antagonism among multiple stressors , 1999 .

[16]  Michel J. Kaiser,et al.  The effects of fishing on marine ecosystems , 1998 .

[17]  Simon Jennings,et al.  Impact of a large-scale area closure on patterns of fishing disturbance and the consequences for benthic communities , 2003 .

[18]  Catherine M. Dichmont,et al.  Can vessel monitoring system data also be used to study trawling intensity and population depletion? The example of Australia's northern prawn fishery , 2005 .

[19]  Jo Foden,et al.  A critical review of approaches to aquatic environmental assessment. , 2008, Marine pollution bulletin.

[20]  Benjamin S Halpern,et al.  Interactive and cumulative effects of multiple human stressors in marine systems. , 2008, Ecology letters.

[21]  M. Kaiser,et al.  Large-scale responses of nematode communities to chronic otter-trawl disturbance , 2008 .

[22]  M. Lindegarth,et al.  Testing hypotheses about temporary and persistent effects of otter trawling on infauna: changes in diversity rather than abundance , 2009 .

[23]  Ellen Kenchington,et al.  Immediate impacts and recovery trajectories of macrofaunal communities following hydraulic clam dredging on Banquereau, eastern Canada , 2005 .

[24]  Paul J. Somerfield,et al.  Global analysis of response and recovery of benthic biota to fishing , 2006 .

[25]  Claude Nedelec,et al.  Definition and Classification of Fishing Gear Categories , 1990 .

[26]  Michel J. Kaiser,et al.  Assessing and predicting the relative ecological impacts of disturbance on habitats with different sensitivities , 2007 .

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

[28]  Michel Desprez,et al.  Physical and biological impact of marine aggregate extraction along the French coast of the Eastern English Channel: short- and long-term post-dredging restoration , 2000 .

[29]  D. Hutchins,et al.  Interactive influences of bioactive trace metals on biological production in oceanic waters , 1991 .

[30]  Jae S. Choi,et al.  Transition to an alternate state in a continental shelf ecosystem , 2004 .

[31]  L. Crowder,et al.  Guiding ecological principles for marine spatial planning , 2010 .

[32]  D. Currie,et al.  Impacts and efficiency of scallop dredging on different soft substrates , 1999 .

[33]  Robert L. Folk,et al.  The Distinction between Grain Size and Mineral Composition in Sedimentary-Rock Nomenclature , 1954, The Journal of Geology.

[34]  Simon Jennings,et al.  Developing reliable, repeatable, and accessible methods to provide high-resolution estimates of fishing-effort distributions from vessel monitoring system (VMS) data , 2010 .

[35]  Elliott A. Norse,et al.  Disturbance of the Seabed by Mobile Fishing Gear: A Comparison to Forest Clearcutting , 1998 .

[36]  Pat Hutchings,et al.  Overview of integrative tools and methods in assessing ecological integrity in estuarine and coastal systems worldwide. , 2008, Marine pollution bulletin.

[37]  P. Lauer,et al.  Impacts of trawling on benthic macro-fauna and -flora of the Spencer Gulf prawn fishing grounds. , 2009 .

[38]  Stuart I. Rogers,et al.  Recovery rates of UK seabed habitats after cessation of aggregate extraction , 2009 .

[39]  Jeremy S. Collie,et al.  Modification of marine habitats by trawling activities: prognosis and solutions , 2002 .

[40]  Michel J. Kaiser,et al.  The impact of otter trawling on mud communities in the northwestern Mediterranean , 2000 .

[41]  Stuart I. Rogers,et al.  Quantifying cumulative impacts of human pressures on the marine environment: a geospatial modelling framework , 2010 .

[42]  Hilmar Hinz,et al.  Trawl disturbance on benthic communities: chronic effects and experimental predictions. , 2009, Ecological applications : a publication of the Ecological Society of America.

[43]  S. J. Hall,et al.  The impact of hydraulic dredging for razor clams Ensis sp. on an infaunal community , 1990 .

[44]  S. Jennings,et al.  Indicators of the Ecological Impact of Bottom-Trawl Disturbance on Seabed Communities , 2006, Ecosystems.

[45]  V. Stelzenmüller,et al.  Spatio-temporal patterns of fishing pressure on UK marine landscapes, and their implications for spatial planning and management , 2008 .

[46]  Michel J. Kaiser,et al.  Cumulative impacts of seabed trawl disturbance on benthic biomass, production, and species richness in different habitats , 2006 .

[47]  Michel J. Kaiser,et al.  Fish scavenging behaviour in recently trawled areas , 1994 .

[48]  K. Cooper,et al.  Recovery of the seabed following marine aggregate dredging on the Hastings Shingle Bank off the southeast coast of England , 2007 .

[49]  Michael J. Fogarty,et al.  Effort distribution and catch patterns adjacent to temperate MPAs , 2005 .

[50]  R. O'Neill,et al.  The value of the world's ecosystem services and natural capital , 1997, Nature.

[51]  J. Collie,et al.  Effects of bottom fishing on the benthic megafauna of Georges Bank , 1997 .

[52]  Michel J. Kaiser,et al.  Survival of by-catch from a beam trawl , 1995 .

[53]  S. Thrush,et al.  Functional changes as indicators of trawling disturbance on a benthic community located in a fishing ground (NW Mediterranean Sea) , 2007 .

[54]  Michel J. Kaiser,et al.  Fishing‐Gear Restrictions and Conservation of Benthic Habitat Complexity , 2000 .

[55]  Barry Smit,et al.  Methods for cumulative effects assessment , 1995 .

[56]  Gerjan J. Piet,et al.  A quantitative evaluation of the impact of beam trawling on benthic fauna in the southern North Sea , 2000 .

[57]  Karen L. McLeod,et al.  Managing for cumulative impacts in ecosystem-based management through ocean zoning , 2008 .