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A seascape-scale habitat model to support management of fishing impacts on benthic ecosystems
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2019
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Source: Canadian Journal of Fisheries and Aquatic Sciences, 76(10), 1836-1844
[PDF-1.11 MB]
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Journal Title:Canadian Journal of Fisheries and Aquatic Sciences
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Description:Minimizing fishing impacts on seafloor ecosystems is a growing focus of ocean management; however, few quantitative tools exist to guide seascape-scale habitat management. To meet these needs, we developed a model to assess benthic ecosystem impacts from fishing gear contact. The habitat impacts model is cast in discrete time and can accommodate overlapping fisheries as well as incorporate gear-specific contact dynamics. We implemented the model in the North Pacific using fishing data from 2003 to 2017, estimating that habitat in 3.1% of the 1.2 million km2study area was disturbed at the end of the simulation period. A marked decline in habitat disturbance was evident since 2010, attributable to a single regulatory gear change that lifted trawl gear components off the seafloor. Running scenarios without these gear modifications showed these policies might have contributed to a 24% reduction in habitat disturbance since their implementation. Ultimately, model outputs provide direct estimates of the spatial and temporal trends of habitat effects from fishing — a key component of regulatory policies for many of the world’s fisheries.
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Source:Canadian Journal of Fisheries and Aquatic Sciences, 76(10), 1836-1844
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ISSN:0706-652X;1205-7533;
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Rights Information:Other
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