Urchin—dive commercial fishing grounds, South Coast Region, Post MPA

This data set is a part of Point 97's project entitled: Establishing a Baseline and Assessing Initial Spatial and Economic Change in the California South Coast Commercial Fisheries. This project is a component of the California South Coast Marine Protected Area Baseline Monitoring Project that is designed to characterize the ecological and socioeconomic conditions and changes within the South Coast Region since MPA implementation. The South Coast study region extends from the north at Point Conception to the south at the California/Mexico border. This data set consists of data collected in the summer of 2013 from fisheries mapping interviews conducted with commercial fishermen who had urchin—dive landings in the California South Coast in 2012. During interviews fishermen were asked to map their fishing grounds for 2012 and determine the relative importance of each fishing ground by allocating 100 pennies across their fishing grounds for this fishery. The spatial data from these interviews were then combined through an aggregation process where the weighted fishing grounds each fisherman gave were further weighted by their ex-vessel revenue from the urchin—dive fishery in 2012. This created spatial data sets for each port for this fishery. For regional or all port data sets, port level data was aggregated by weighting each port by the port’s total ex-vessel revenue in 2012 for the fishery based on California Department of Fish and Wildlife commercial landings data. This data set represents the spatial extent and relative value of urchin—dive commercial fishing grounds for the South Coast Region in the year 2012.本数据集隶属于Point 97的研究项目，项目全称为：《加州南海岸商业渔业基线建立与初始空间及经济变化评估》。该项目是加州南海岸海洋保护区（Marine Protected Area）基线监测项目的组成部分，旨在刻画自海洋保护区实施以来南海岸区域的生态与社会经济状况及其变化。本次研究的南海岸研究区域北起康塞普西翁角（Point Conception），南至加州与墨西哥边境。 本数据集的数据采集自2013年夏季开展的渔业制图访谈，访谈对象为2012年在加州南海岸开展海胆潜水捕捞作业并完成上岸交易的商业渔民。访谈过程中，渔民需绘制其2012年的捕捞海域范围，并通过将100枚便士分配至各捕捞海域的方式，标注各海域的相对重要性。 随后通过聚合流程整合本次访谈获取的空间数据：先将每位渔民提供的捕捞海域权重，结合其2012年海胆潜水捕捞渔业的船侧收入（ex-vessel revenue）进行二次加权，以此生成对应各港口的该渔业空间数据集。 对于区域级或全港口数据集，则通过聚合流程整合各港口数据：依据加州鱼类与野生动物局（California Department of Fish and Wildlife）的商业上岸数据，以各港口2012年该渔业的总船侧收入作为权重，对港口级数据进行聚合。 本数据集刻画了2012年加州南海岸区域海胆潜水捕捞商业捕捞海域的空间范围与相对价值。