The Spatial Expansion and Ecological Footprint of Fisheries (1950 to Present) Swartz, Wilf ; Sala, Enric ; Tracey, Sean ; Watson, Reg ; Pauly, Daniel Abstract Publication: PLoS ONE Pub Date: December 2010 DOI: 10.1371/journal.pone.0015143 Bibcode: 2010PLoSO...515143S