Assessment of Entanglement Risk: A Vertical Line Co-occurrence Model of Large Whales and the Commercial Fixed Gear Dungeness Crab (Cancer magister) Fishery Off the U.S. West Coast
Thesis (Master's)--University of Washington, 2018 Since 2014, reports of whale entanglements have spiked along the U.S. West Coast from an average of 10 confirmed cases per year to up to 71 reported entanglements in 2016. The commercial fixed gear Dungeness crab (Cancer magister) fishery has be...
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ftunivwashington:oai:digital.lib.washington.edu:1773/43408 2023-05-15T15:37:15+02:00 Assessment of Entanglement Risk: A Vertical Line Co-occurrence Model of Large Whales and the Commercial Fixed Gear Dungeness Crab (Cancer magister) Fishery Off the U.S. West Coast Macks, Samantha C. Fluharty, David 2018 application/pdf http://hdl.handle.net/1773/43408 en_US eng Macks_washington_0250O_19588.pdf http://hdl.handle.net/1773/43408 none baleen whales Dungeness crab fishery risk assessment U.S. West Coast vertical line co-occurrence whale entanglement Wildlife management Wildlife conservation Geographic information science and geodesy Marine affairs Thesis 2018 ftunivwashington 2023-03-12T18:59:05Z Thesis (Master's)--University of Washington, 2018 Since 2014, reports of whale entanglements have spiked along the U.S. West Coast from an average of 10 confirmed cases per year to up to 71 reported entanglements in 2016. The commercial fixed gear Dungeness crab (Cancer magister) fishery has been the most identifiable gear in confirmed whale entanglements. The continued high number of reported whale entanglements has warranted fishery managers, fishermen, and other stakeholders to look into solutions to reducing the number of entangled whales; however, a better understanding of where and why these entanglement rates have spiked is needed. Previous efforts by National Marine Fisheries Service (NMFS) to understand entanglement risk designed a co-occurrence model to assess entanglement risk along the West Coast by overlaying landings data with species-specific whale density and distribution patterns to produce relative co-occurrence scores as an indicator for risk. The purpose of this study was to create a vertical line co-occurrence model between large whales and the commercial Dungeness crab fishery; as NMFS indicated in their previous model, that the use of gear density instead of the number of pounds landed to represent fishing effort provides a better understanding of high entanglement risk areas. This research provides a comparison to previous co-occurrence modeling efforts, highlights the areas and months of high entanglement risk, and compares risk areas over several time periods. The vertical line co-occurrence models piloted in this study created a new understanding of areas of entanglement risk for large whales in recent years to aid future efforts by NMFS and fishery managers to mitigate large whale entanglements. Thesis baleen whales University of Washington, Seattle: ResearchWorks |
institution |
Open Polar |
collection |
University of Washington, Seattle: ResearchWorks |
op_collection_id |
ftunivwashington |
language |
English |
topic |
baleen whales Dungeness crab fishery risk assessment U.S. West Coast vertical line co-occurrence whale entanglement Wildlife management Wildlife conservation Geographic information science and geodesy Marine affairs |
spellingShingle |
baleen whales Dungeness crab fishery risk assessment U.S. West Coast vertical line co-occurrence whale entanglement Wildlife management Wildlife conservation Geographic information science and geodesy Marine affairs Macks, Samantha C. Assessment of Entanglement Risk: A Vertical Line Co-occurrence Model of Large Whales and the Commercial Fixed Gear Dungeness Crab (Cancer magister) Fishery Off the U.S. West Coast |
topic_facet |
baleen whales Dungeness crab fishery risk assessment U.S. West Coast vertical line co-occurrence whale entanglement Wildlife management Wildlife conservation Geographic information science and geodesy Marine affairs |
description |
Thesis (Master's)--University of Washington, 2018 Since 2014, reports of whale entanglements have spiked along the U.S. West Coast from an average of 10 confirmed cases per year to up to 71 reported entanglements in 2016. The commercial fixed gear Dungeness crab (Cancer magister) fishery has been the most identifiable gear in confirmed whale entanglements. The continued high number of reported whale entanglements has warranted fishery managers, fishermen, and other stakeholders to look into solutions to reducing the number of entangled whales; however, a better understanding of where and why these entanglement rates have spiked is needed. Previous efforts by National Marine Fisheries Service (NMFS) to understand entanglement risk designed a co-occurrence model to assess entanglement risk along the West Coast by overlaying landings data with species-specific whale density and distribution patterns to produce relative co-occurrence scores as an indicator for risk. The purpose of this study was to create a vertical line co-occurrence model between large whales and the commercial Dungeness crab fishery; as NMFS indicated in their previous model, that the use of gear density instead of the number of pounds landed to represent fishing effort provides a better understanding of high entanglement risk areas. This research provides a comparison to previous co-occurrence modeling efforts, highlights the areas and months of high entanglement risk, and compares risk areas over several time periods. The vertical line co-occurrence models piloted in this study created a new understanding of areas of entanglement risk for large whales in recent years to aid future efforts by NMFS and fishery managers to mitigate large whale entanglements. |
author2 |
Fluharty, David |
format |
Thesis |
author |
Macks, Samantha C. |
author_facet |
Macks, Samantha C. |
author_sort |
Macks, Samantha C. |
title |
Assessment of Entanglement Risk: A Vertical Line Co-occurrence Model of Large Whales and the Commercial Fixed Gear Dungeness Crab (Cancer magister) Fishery Off the U.S. West Coast |
title_short |
Assessment of Entanglement Risk: A Vertical Line Co-occurrence Model of Large Whales and the Commercial Fixed Gear Dungeness Crab (Cancer magister) Fishery Off the U.S. West Coast |
title_full |
Assessment of Entanglement Risk: A Vertical Line Co-occurrence Model of Large Whales and the Commercial Fixed Gear Dungeness Crab (Cancer magister) Fishery Off the U.S. West Coast |
title_fullStr |
Assessment of Entanglement Risk: A Vertical Line Co-occurrence Model of Large Whales and the Commercial Fixed Gear Dungeness Crab (Cancer magister) Fishery Off the U.S. West Coast |
title_full_unstemmed |
Assessment of Entanglement Risk: A Vertical Line Co-occurrence Model of Large Whales and the Commercial Fixed Gear Dungeness Crab (Cancer magister) Fishery Off the U.S. West Coast |
title_sort |
assessment of entanglement risk: a vertical line co-occurrence model of large whales and the commercial fixed gear dungeness crab (cancer magister) fishery off the u.s. west coast |
publishDate |
2018 |
url |
http://hdl.handle.net/1773/43408 |
genre |
baleen whales |
genre_facet |
baleen whales |
op_relation |
Macks_washington_0250O_19588.pdf http://hdl.handle.net/1773/43408 |
op_rights |
none |
_version_ |
1766367714699378688 |