Ecopath

Ecopath with Ecosim is a free ecosystem modelling software suite, initially started at NOAA by Jeffrey Polovina, but has since primarily been 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 NOAAs 200year history. The NOAA citation states that Ecopath revolutionized scientists ability worldwide to understand complex marine ecosystems. Behind this lie more than two decades of development work in association with Villy Christensen, Carl Walters, Daniel Pauly, and other fisheries scientists, followed with the provision of user support, training and codevelopment collaborations. Per January 2012 there are 6000 registered users in 150 countries.

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Source: Wikipedia