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iii COMMITTEE MEMBERSHIP TITLE: A spatial analysis of changes in recreational fishing pressure on the central coast of California subsequent to MPA implementation iv ABSTRACT A spatial analysis of changes in recreational fishing pressure on the central coast of California subsequent to MPA implementation Morgan Ivens-Duran Marine Protected Areas (MPAs) are implemented to address a variety of management concerns, including conservation and restoration of fisheries, but few studies assess how MPAs affect regional fishing patterns. Previous research suggests effort will intensify at MPA edges, but few datasets include sufficient pre-implementation data to quantify how MPAs alter fishing effort. We used recreational fisheries data collected by scientific observers aboard Commercial Passenger Fishing Vessels that target nearshore fish species, primarily rockfish. We assessed shifts in the spatial distribution of fishing effort over a 10-year period that includes pre-and post-implementation observations of the California MPA network along the Central Coast. We visually depict fine-scale annual fishing pressure, calculate total regional effort, and identify changing hot spots of fishing activity. While we found no evidence for " fishing the line " , MPA implementation was associated with changes in regional fishing patterns, including contraction of fishing effort away from the northern extent of the region and increased effort intensity in some pre-MPA fishing hotspots. Fishing effort redistribution should be considered in future management decisions regarding California's MPA network. Webster for their work with the Cal Poly CPFV Observer Program. Andrew Schaffner from the Cal Poly Statstics Department provided invaluable assistance with developing the data analysis methods used in this study. Russell White at the Cal Poly Kennedy Library Data Studio provided help with the ArcGIS analysis, and Brian Zelenke at Cal Poly assisted with the MATLAB analysis as well as providing general technical assistance. Deborah Aseltine-Neilson and Jana Robertson from the California Department of Fish & Wildlife provided additional data. We would especially like to thank the staff, captains, and crew of Virg's Sportfishing, Patriot Sportfishing, and Central Coast Sportfishing, who allowed us to observe their fishing trips and without whom this project would not have been possible.