MLPA North Coast Monitoring - Region - 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 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 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 Region in the year 2013.

本数据集为Point 97项目的组成部分，该项目主题为《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）基线监测项目的子项目，旨在表征自海洋保护区实施以来，北海岸区域内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的数据，访谈对象为2013年在本区域港口有邓杰内斯蟹（Dungeness crab）笼捕渔获物上岸的商业渔民。访谈环节要求渔民绘制2013年的捕鱼海域分布图，并通过将100枚便士分配至各捕鱼海域的方式，量化各海域的相对重要性。随后，通过聚合流程整合本次访谈获取的空间数据：将每位渔民提供的加权捕鱼海域，再按照其2013年邓杰内斯蟹笼捕渔业的船边交货收入（ex-vessel revenue）进行二次加权，由此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收入为权重，对港口级数据进行聚合整合。本数据集呈现了2013年本区域港口邓杰内斯蟹笼捕商业捕鱼海域的空间范围与相对价值。