Lobster—trap 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 lobster—trap 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 lobster—trap 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 lobster—trap commercial fishing grounds for the South Coast Region in the year 2012.

本数据集隶属于Point 97开展的题为《加利福尼亚南海岸商业捕捞渔业基线建立与初始空间、经济变化评估》的研究项目。该项目是加利福尼亚南海岸海洋保护区（Marine Protected Area, MPA）基线监测项目的组成部分，旨在表征自海洋保护区实施以来南海岸区域的生态、社会经济状况及其变化。本次南海岸研究区域北起康塞普西翁角（Point Conception），南至加利福尼亚州与墨西哥边境。本数据集包含2013年夏季开展的渔业制图访谈数据，访谈对象为2012年在加利福尼亚南海岸开展龙虾笼捕捞并产生渔获上岸量的商业渔民。访谈过程中，渔民需绘制其2012年的作业渔场分布图，并通过向各作业渔场分配100个权重单位的方式，明确各渔场的相对重要性。随后通过聚合流程整合本次访谈获取的空间数据，将每位渔民提供的作业渔场权重，进一步以其2012年该龙虾笼捕捞渔业的船上交货收入（ex-vessel revenue）进行二次加权，以此为该渔业生成各港口对应的空间数据集。针对区域级或全港口数据集，则以各港口2012年该渔业的总船上交货收入为权重，基于加利福尼亚州鱼类与野生动物部（California Department of Fish and Wildlife）的商业渔获上岸量数据，对港口层级的数据进行聚合。本数据集表征了2012年南海岸区域龙虾笼商业捕捞作业海域的空间范围与相对价值。