00000nam 2200000zi 4500 9.889785 CaOODSP 20221107172408 m o d f cr mn||||||||| 200727t20212021mbcab ob f000 0 eng d 9780660356471 CaOODSP eng rda CaOODSP eng eng fre r------ n-cn-nt n-cn-yk x7y1 Fs97-13/1313E-PDF Hoover, C. A. (Carie A.) author. Canadian Beaufort Sea Shelf food web structure and changes from 1970-2012 / by Carie Hoover, Wojciech Walkusz, Shannon MacPhee, Andrea Niemi, Andrew Majewski, and Lisa Loseto. Winnipeg, MB : Central and Arctic Region, Fisheries and Oceans Canada, 2021. ©2021 1 online resource (viii, 97 pages) : illustrations (some colour), colour map. text txt rdacontent computer c rdamedia online resource cr rdacarrier Canadian data report of fisheries and aquatic sciences, 1488-5395 ; 1313 Includes bibliographical references (pages 66-85). "In order to better understand the structure of the Canadian Beaufort Sea Shelf marine ecosystem and potential impacts of multiple stressors, an Ecopath with Ecosim food web model was created. Construction of the food web model was achieved by linking predators and prey through trophic interactions to identify the structure of the ecosystem and changes over time. The Ecopath (static) portion of the model contains 33 functional groups ranging from primary producers and detritus to whales and was set to the year 1970 to represent a past, stable ecosystem structure. The Ecopath model synthesizes existing data for the ecosystem, in addition to estimating unknown parameters such as conservative estimates of fish biomass in the system based on predator's dietary needs and ecosystem productivity. In addition, harvest mortality for all harvested fish and mammals within the model are identified and summarized. Changes to the ecosystem driven by reductions in sea ice and increases in sea surface temperature are considered large compared to harvest mortality impacts. While changes to individual species or species groups range (from -20% to +135% of starting biomass) over the 1970-2012 temporal simulation, total ecosystem biomass increases (~30%) over the historical simulation, with ecosystem trophic level remaining stable (<1% change)"--Abstract, page vii. Includes abstracts in English and French. Food chains (Ecology) Beaufort Sea Mathematical models. Food chains (Ecology) Inuvialuit Settlement Region (N.W.T. and Yukon) Mathematical models. Marine ecology Beaufort Sea Mathematical models. Marine ecology Inuvialuit Settlement Region (N.W.T. and Yukon) Mathematical models. Chaînes alimentaires (Écologie) Beaufort, Mer de Modèles mathématiques. Chaînes alimentaires (Écologie) Inuvialuit (T.N.-O. et Yukon : Région) Modèles mathématiques. Écosystèmes marins Beaufort, Mer de Modèles mathématiques. Écosystèmes marins Inuvialuit (T.N.-O. et Yukon : Région) Modèles mathématiques. Canada. Department of Fisheries and Oceans. Central and Arctic Region, issuing body. Canadian data report of fisheries and aquatic sciences ; 1313. (CaOODSP)9.505124 PDF 2.00 MB https://publications.gc.ca/collections/collection_2021/mpo-dfo/Fs97-13-1313-eng.pdf