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Villy Christensen
Villy Christensen is an ecosystem modeller with a background in fisheries science. He is known for his work as a project leader and core developer of Ecopath, an ecosystem modelling software system widely used in fisheries management.〔(Ecopath with Ecosym ) Main website.〕 Ecopath was initially an initiative of the NOAA, but since primarily developed at the UBC Fisheries Centre of the University of British Columbia. In 2007, it was named as one of the ten biggest scientific breakthroughs in NOAA’s 200-year history. The citation states that Ecopath “revolutionized scientists’ ability worldwide to understand complex marine ecosystems”.〔NOAA: (ECOPATH Modeling: Precursor to an Ecosystem Approach to Fisheries Management ) Top ten breakthroughs.〕
==Biography==
Christensen did his Ph.D under Sven Erik Jørgensen at Copenhagen University. Jeffrey Polovina initiated the Ecopath approach in the early 1980s.〔Polovina JJ and Marten, GG (1982) "A comparative study of fish yields from various tropical ecosystems". In: Pauly D and Murphy GI (Eds.) ''Theory and Management of Tropical Fisheries.''
ICLARM Conference Proceedings 9, 255–286.〕 Christensen, along with Daniel Pauly and others, has been involved in the subsequent development of Ecopath since 1990.〔Christensen V and Pauly D (1992) ("ECOPATH II - A software for balancing steady-state ecosystem models and calculating network characteristics" ) ''Ecological Modelling'', 61:169-185.〕〔Christensen V and Walters CJ (2004) ("Ecopath with Ecosim: methods, capabilities and limitations" ) ''Ecological Modelling'' 172, 109–139〕
Christensen currently facilitates international workshops on Ecopath around the world. He is a professor at the UBC Fisheries Centre at the University of British Columbia, specialising in ecosystem modelling. His main project is with the Sea Around Us Project working on "database-driven ecosystem model construction", with the aim of using "global, spatial databases to parameterize, balance and fit ecosystem models".〔(Dr Villy Christensen ) UBC web site. Retrieved 17 June 2009.〕 This work includes developing a dynamic exchange model of biomass over time in the Chesapeake Bay area, as well as how marine protected areas can be optimally positioned.〔 He is also director of the Lenfest Ocean Futures Project,〔(Lenfest Ocean Futures Project )〕 where a visualization system is being developed to support decision making in ecosystem-based fisheries management. This system combines Blender, a 3D-gaming engine, with Ecopath.〔(MDM/UBC Fisheries Ocean Viz Collaboration ) Youtube.〕〔(Fish Population Data Visualisation ) ''BlenderNation'', 9 April 2008〕〔(Ocean ) 120MB video.〕〔(Ocean Summits and Virtual Fish: Games for a Sustainable Future )〕
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