Dungeness crab—trap commercial fishing grounds, San Francisco, 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 California halibut—hook and line 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 California halibut—hook and line 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 San Francisco in the year 2010.

本数据集为生态信托（Ecotrust）项目的组成部分，该项目题为《建立基线并评估加利福尼亚中北海岸商业渔业的初始空间与经济变化》。本项目是加利福尼亚中北海岸海洋保护区（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，中北海岸区域的生态与社会经济状况及变化。中北海岸研究区域北起阿尔德溪（Alder Creek），南至鸽子角（Pigeon Point）。本数据集包含2011年夏季开展的渔业制图访谈采集的数据，访谈对象为2010年在加利福尼亚中北海岸开展加州庸鲽钩绳作业捕捞上岸的商业渔民。访谈过程中，渔民需绘制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，确定各作业渔场的相对重要性。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作业渔场，再以其2010年加州庸鲽钩绳作业渔业的船边营收（ex-vessel revenue）进行二次加权，由此生成该渔业各港口的空间数据集。对于区域或全港口数据集，则基于加利福尼亚鱼类与野生动物局（California Department of Fish and Wildlife）的商业上岸数据，以各港口2010年该渔业的总船边营收为权重，聚合港口级数据。本数据集代表2010年旧金山港的邓杰内斯蟹笼捕商业作业渔场的空间范围与相对价值。