Dungeness crab—trap commercial fishing grounds, Bodega Bay, Post MPA

This data set is a part of Ecotrust's project entitled: Establishing a Baseline and Assessing Initial Spatial and Economic Change in the California North Central Coast Commercial Fisheries. This project is a component of the California North Central Coast Marine Protected Area Baseline Monitoring Project that is designed to characterize the ecological and socioeconomic conditions and changes within the North Central Coast Region since MPA implementation. The North Central Coast study region extends from the north at Alder Creek to the south at Pigeon Point. This data set consists of data collected in the summer of 2011 from fisheries mapping interviews conducted with commercial fishermen who had Dungeness crab—trap landings in the California North Central Coast in 2010. During interviews fishermen were asked to map their fishing grounds for 2010 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 2010. 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 2010 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 Bodega Bay in the year 2010.

本数据集隶属于生态信托（Ecotrust）发起的研究项目，项目全称为：《加州北中海岸商业渔业基线建立与初始空间及经济变化评估》。该项目是加州北中海岸海洋保护区（Marine Protected Area, MPA）基线监测项目的组成部分，旨在刻画北中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其变化。本次研究的北中海岸研究区域北起阿尔德溪（Alder Creek），南至鸽子角（Pigeon Point）。本数据集涵盖2011年夏季开展的渔业制图访谈采集的全部数据，访谈对象为2010年在加州北中海岸开展邓杰内斯蟹笼捕（Dungeness crab-trap）作业并完成渔获上岸的商业渔民。访谈期间，要求渔民绘制其2010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，量化各渔场的相对重要性。随后，研究人员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作业渔场，进一步以其2010年邓杰内斯蟹笼捕作业的渔获离船收入进行二次加权，由此生成该渔业各对应港口的空间数据集。若为区域级或全港口级数据集，则基于加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2010年该渔业的总离船收入为权重，对港口级数据进行聚合整合。本数据集即为2010年加州波迪加湾（Bodega Bay）港口的邓杰内斯蟹笼捕商业作业渔场的空间范围与相对价值数据。