MLPA North Coast Monitoring - Fort Bragg - Dungeness crab-trap - 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 Dungeness crab—trap 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 Dungeness crab—trap 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 Dungeness crab—trap commercial fishing grounds for the port of Fort Bragg in the year 2013.

本数据集是Point 97项目“建立基线并评估加州北海岸商业渔业的初始空间与经济变化”的一部分。该项目是加州北海岸海洋保护区基线监测项目的组成部分，旨在描述海洋保护区（Marine Protected Area, MPA）实施以来北海岸区域内的生态及社会经济状况与变化。北海岸研究区域北起俄勒冈州与加州边界，南至阿勒德溪（Point Arena以北）。

本数据集包含2014年夏季通过渔业制图访谈收集的数据，访谈对象为2013年在布拉格堡港有珍宝蟹（Dungeness crab）笼捕上岸量的商业渔民。访谈中要求渔民绘制其2013年的渔场分布图，并通过在各渔场间分配100枚硬币来确定每个渔场对该渔业的相对重要性。

这些访谈得到的空间数据随后通过聚合过程整合：渔民提供的加权渔场数据进一步以其2013年珍宝蟹笼捕渔业的渔获离岸收入为权重进行加权，从而为该渔业的每个港口生成空间数据集。对于区域或全港口数据集，基于加州鱼类及野生动物部的商业上岸量数据，港口层面的数据通过以各港口2013年该渔业的总渔获离岸收入为权重进行聚合。

本数据集反映了2013年布拉格堡港珍宝蟹笼捕商业渔场的空间范围及相对价值。