MLPA North Coast Monitoring - Fort Bragg - 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 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 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 port of Fort Bragg in the year 2013.

本数据集是Point 97某项目的组成部分，该项目全称为「建立加利福尼亚北海岸商业渔业基线并评估其初始空间与经济变化」。该项目为加利福尼亚北海岸海洋保护区（Marine Protected Area，简称MPA）基线监测项目的子项目，旨在表征北海岸区域自海洋保护区实施以来的生态与社会经济状况及变化。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），地处阿雷角（Point Arena）以北。本数据集涵盖2014年夏季开展的渔业测绘访谈采集所得数据，访谈对象为2013年在布拉格堡港（Fort Bragg）完成海胆潜水捕捞渔获上岸作业的商业渔民。访谈期间，渔民需绘制其2013年的捕捞作业海域，并通过将100枚便士分配至各捕捞海域的方式，量化各海域的相对重要性。随后，访谈获取的空间数据经聚合流程整合：每位渔民提交的加权捕捞海域数据，将以其2013年海胆潜水捕捞渔业的船边交货收入（ex-vessel revenue）进行二次加权。该流程最终生成对应各港口的该渔业空间数据集。针对区域级或全港口级数据集，则以2013年该渔业各港口总船边交货收入（基于加利福尼亚州鱼类与野生动物部商业渔获上岸数据）为权重，完成各港口数据的聚合。本数据集表征了2013年布拉格堡港海胆潜水捕捞商业捕捞海域的空间范围与相对价值。