MLPA North Coast Monitoring - Region - urchin - dive - 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 North Coast Commercial Fisheries. This project is a component of the California North Coast Marine Protected Area Baseline Monitoring Project that is designed to characterize the ecological and socioeconomic conditions and changes within the North Coast Region since MPA implementation. The North Coast study region extends from the north at Oregon/California border to the south at Alder Creek, just north of Point Arena. This data set consists of data collected in the summer of 2014 from fisheries mapping interviews conducted with commercial fishermen who had urchin - dive landings in the port of Region in 2013. During interviews fishermen were asked to map their fishing grounds for 2013 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 2013. 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 2013 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 region in the year 2013.

本数据集为Point 97项目"建立基线并评估加利福尼亚北海岸商业渔业初始空间与经济变化"的组成部分。该项目是加利福尼亚北海岸海洋保护区（Marine Protected Area, MPA）基线监测项目的子任务，旨在表征自MPA实施以来北海岸区域的生态与社会经济状况及其变化。北海岸研究区域北起俄勒冈州与加利福尼亚州边境，南至阿雷角（Point Arena）以北的阿尔德溪（Alder Creek）。本数据集包含2014年夏季开展的渔业测绘访谈采集的数据，访谈对象为2013年在本区域港口有海胆潜水捕捞渔获上岸记录的商业渔民。访谈过程中，渔民需绘制2013年的作业渔场分布图，并通过将100枚便士分配至各作业渔场的方式，明确各渔场的相对重要性。随后通过聚合流程整合访谈获取的空间数据，将每位渔民提供的加权作业渔场，再依据其2013年海胆潜水捕捞渔业的船边交货营收（ex-vessel revenue）进行二次加权，最终生成该渔业对应各港口的空间数据集。对于区域级或全港口数据集，则依据加利福尼亚州鱼类与野生动物部（California Department of Fish and Wildlife）的商业渔获上岸数据，以各港口2013年该渔业的总船边交货营收为权重，聚合各港口层级的数据。本数据集呈现了2013年该区域海胆潜水捕捞商业作业渔场的空间范围与相对价值。