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Tuesday, March 26, 2013

PUBLICATIONS: Assessing the Risk of Ships Striking Large Whales in Marine Spatial Planning

humpback whale fin
humpback whale fin (Photo credit: Wikipedia)
We are pleased to announce publication of the following paper:
Redfern, J. V., M. F. McKenna, T. J. Moore, J. Calambokidis, M. L. DeAngelis, E. A. Becker, J. Barlow, K. A. Forney, P. C. Fiedler, and S. J. Chivers. 2013. Assessing the risk of ships striking large whales in marine spatial planning. Conservation Biology 27:292-302.

The abstract appears below.  Please contact (Jessica.Redfern@noaa.gov), if you would like a copy of the PDF.


Abstract
Marine spatial planning provides a comprehensive framework for managing multiple uses of the marine environment and has the potential to minimize environmental impacts and reduce conflicts among users.  Spatially explicit assessments of the risks to key marine species from human activities are a requirement of marine spatial planning.  We assessed the risk of ships striking humpback (Megaptera novaeangliae), blue (Balaenoptera musculus), and fin (B. physalus) whales in alternative shipping routes derived from patterns of shipping traffic off Southern California (U.S.A.).  Specifically, we developed whale-habitat models and assumed ship-strike risk for the alternative shipping routes was proportional to the number of whales predicted by the models to occur within each route.  This definition of risk assumes all ships travel within a single route.  We also calculated risk assuming ships travel via multiple routes.  We estimated the potential for conflict between shipping and other uses (military training and fishing) due to overlap with the routes.  We also estimated the overlap between shipping routes and protected areas.  The route with the lowest risk for humpback whales had the highest risk for fin whales and vice versa.  Risk to both species may be ameliorated by creating a new route south of the northern Channel Islands and spreading traffic between this new route and the existing route in the Santa Barbara Channel.  Creating a longer route may reduce the overlap between shipping and other uses by concentrating shipping traffic.  Blue whales are distributed more evenly across our study area than humpback and fin whales; thus, risk could not be ameliorated by concentrating shipping traffic in any of the routes we considered.  Reducing ship-strike risk for blue whales may be necessary because our assessment of the potential number of strikes suggests that they are likely to exceed allowable levels of anthropogenic impacts established under U.S. laws.  -->

Jessica V. Redfern, Ph.D.  Ecosystem Studies Program Leader  Marine Mammal and Turtle Division  Southwest Fisheries Science Center  National Marine Fisheries Service  National Oceanic and Atmospheric Administration   8901 La Jolla Shores Dr.  La Jolla, California  92037    phone: 858-546-7117  fax: 858-546-7003

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