MLPA North Coast Monitoring - Fort Bragg - Salmon - troll - 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 Salmon - troll landings in the port of Fort Bragg 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 Salmon - troll 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 Salmon - troll commercial fishing grounds for the port of Fort Bragg in the year 2013.

本数据集隶属于Point 97的课题项目，课题全称：《建立基线并评估加利福尼亚北海岸商业渔业的初始空间与经济变化》。该项目是加利福尼亚北海岸海洋保护区（Marine Protected Area，MPA）基线监测项目的组成部分，旨在刻画海洋保护区实施后北海岸区域的生态、社会经济状况及其变化情况。本次研究的北海岸研究区域北起俄勒冈州与加利福尼亚州州界，南至阿尔德溪（Alder Creek），地处阿伦岬（Point Arena）以北区域。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年在布拉格堡港（Fort Bragg）有鲑鱼拖钓捕捞上岸记录的商业渔民。访谈过程中，渔民需绘制其2013年的捕捞海域分布图，并通过将100枚便士分摊至各捕捞海域的方式，确定各捕捞海域在本次渔业中的相对重要性。随后，通过聚合处理整合本次访谈获取的空间数据：将每位渔民提供的加权捕捞海域权重，依据其2013年鲑鱼拖钓渔业的船边交货收入（ex-vessel revenue）进行二次加权。由此生成针对该渔业、适配各港口的空间数据集。若需生成区域级或全港口级数据集，则需以各港口2013年该渔业的总船边交货收入为权重，聚合各港口的分级数据，该收入数据源自加利福尼亚州鱼类与野生动物部（California Department of Fish and Wildlife）的商业上岸量统计资料。本数据集刻画了2013年布拉格堡港鲑鱼拖钓商业捕捞海域的空间分布范围与相对价值。