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General information

Author(s) : Benda-Beckmann, A.M. von , G. Aarts, H.O. Sertlek, K. Lucke, W.C. Verboom, R.A. Kastelein, D.R. Ketten, R, van Bemmelen, F.P.A. Lam, J kirkwood, & M.A. Ainslie
Title : Assessing the Impact of Underwater Clearance of Unexploded Ordnance on Harbour Porpoises (Phocoena phocoena) in the Southern North Sea
Publication : Journal Article: Aquatic Mammals
Year : 2015

Content

Keyword(s) :-
Abstracts : Large amounts of legacy unexploded ordnance (UXO) are still present in the North Sea. UXO are frequently accidentally encountered by fishermen and dredging vessels. Out of concern for human safety and to avoid damage to equipment and infrastructure from uncontrolled explosions, most reported UXO found in the Dutch Continental Shelf (DCS) are detonated in a controlled way. These underwater detonations produce high amplitude shock waves that may adversely affect marine mammals. The most abundant marine mammal in the DCS is the harbour porpoise (Phocoena phocoena), a species demonstrated to be highly sensitive to sound. Therefore, an assessment of potential impacts of underwater explosions on harbour porpoises was undertaken. Information regarding UXO cleared in the DCS provided by the Netherlands Ministry of Defence was used in a propagation model to produce sound exposure maps. These were combined with esti¬mates of exposure levels predicted to cause hear¬ing loss in harbour porpoises and survey-based models of harbour porpoise seasonal distribution on the DCS. It was estimated that in a 1-y period, the 88 explosions that occurred in the DCS very likely caused 1,280, and possibly up to 5,450, permanent hearing loss events (i.e., instances of a harbour porpoise predicted to have received suffi¬cient sound exposure to cause permanent hearing loss). This study is the first to address the impacts of underwater explosions on the population scale of a marine mammal species. The methodology is applicable to other studies on the effects of under¬water explosions on the marine environment.

Relations

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Project(s) :
  CHARLET  Primary Production in the North Sea: CHAnges in Resource Limitation and Energy Transfer
    Effects of underwater noise on fish and marine mammals in the North Sea
    Impact on mammals: The effects of natural and anthropogenic underwater noise sound on the distribution and habitat use of ma
Dataset(s) :
  Aarts (G.M.) -Impact on mammals: The effects of natural and anthropogenic underwater noise sound on the distribution and habitat use of marine
Document(s) :
Assessing the Impact of Underwater Clearance of Unexploded Ordnance on Harbour Porpoises (Phocoena phocoena) in the Southern North Sea