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Developing expert scientific consensus on the environmental and societal effects of marine artificial structures prior to decommissioning
Knights, A.M.; Lemasson, A.J.; Firth, L.B.; Bond, T.; Claisse, J.; Coolen, J.W.P.; Copping, A.; Dannheim, J.; De Dominicis, M.; Degraer, S.; Elliott, M.; Fernandes, P.G.; Fowler, A.M.; Frost, M.; Henry, L.A.; Hicks, N.; Hyder, K.; Jagerroos, S.; Jones, D.O.B.; Love, M.; Lynam, C.P.; Macreadie, P.I.; Marlow, J.; Mavraki, N.; McLean, D.; Montagna, P.A.; Paterson, D.M.; Perrow, M.; Portera, J.; Russell, D.J.F.; Bull, A.S.; Schratzberger, M.; Shipley, B.; van Elden, S.; Vanaverbeke, J.; Want, A.; Watson, S.C.L.; Wilding, T.A.; Somerfield, P. (2024). Developing expert scientific consensus on the environmental and societal effects of marine artificial structures prior to decommissioning. J. Environ. Manage. 352: 119897. https://dx.doi.org/10.1016/j.jenvman.2023.119897
In: Journal of Environmental Management. Academic Press: London; New York. ISSN 0301-4797; e-ISSN 1095-8630
Peer reviewed article  
Available in  Authors 
Keyword
    Marine/Coastal
Author keywords
    Oil and gas platforms; Offshore wind; Impact assessment; Decommissioning; Environmental management; Expert judgement
Authors  Top 
  • Knights, A.M.
  • Lemasson, A.J.
  • Firth, L.B.
  • Bond, T.
  • Claisse, J.
  • Coolen, J.W.P.
  • Copping, A.
  • Dannheim, J.
  • De Dominicis, M.
  • Degraer, S., more
  • Elliott, M.
  • Fernandes, P.G.
  • Fowler, A.M.
  • Frost, M.
  • Henry, L.A.
  • Hicks, N.
  • Hyder, K.
  • Jagerroos, S.
  • Jones, D.O.B.
  • Love, M.
  • Lynam, C.P.
  • Macreadie, P.I.
  • Marlow, J.
  • Mavraki, N.
  • McLean, D.
  • Montagna, P.A.
  • Paterson, D.M.
  • Perrow, M.
  • Portera, J.
  • Russell, D.J.F.
  • Bull, A.S.
  • Schratzberger, M.
  • Shipley, B.
  • van Elden, S.
  • Vanaverbeke, J., more
  • Want, A.
  • Watson, S.C.L.
  • Wilding, T.A.
  • Somerfield, P.
Abstract
    Thousands of artificial ('human -made') structures are present in the marine environment, many at or approaching end -of -life and requiring urgent decisions regarding their decommissioning. No consensus has been reached on which decommissioning option(s) result in optimal environmental and societal outcomes, in part, owing to a paucity of evidence from real -world decommissioning case studies. To address this significant challenge, we asked a worldwide panel of scientists to provide their expert opinion. They were asked to identify and characterise the ecosystem effects of artificial structures in the sea, their causes and consequences, and to identify which, if any, should be retained following decommissioning. Experts considered that most of the pressures driving ecological and societal effects from marine artificial structures (MAS) were of medium severity, occur frequently, and are dependent on spatial scale with local -scale effects of greater magnitude than regional effects. The duration of many effects following decommissioning were considered to be relatively short, in the order of days. Overall, environmental effects of structures were considered marginally undesirable, while societal effects marginally desirable. Experts therefore indicated that any decision to leave MAS in place at end -of -life to be more beneficial to society than the natural environment. However, some individual environmental effects were considered desirable and worthy of retention, especially in certain geographic locations, where structures can support improved trophic linkages, increases in tourism, habitat provision, and population size, and provide stability in population dynamics. The expert analysis consensus that the effects of MAS are both negative and positive for the environment and society, gives no strong support for policy change whether removal or retention is favoured until further empirical evidence is available to justify change to the status quo. The combination of desirable and undesirable effects associated with MAS present a significant challenge for policy- and decisionmakers in their justification to implement decommissioning options. Decisions may need to be decided on a case -by -case basis accounting for the trade-off in costs and benefits at a local level.
All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors 
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