Community Surveys: Swath Surveys

Invertebrate and algae surveys are comprised of two components, sampled along the same transects: (1) uniform point contact (UPC) estimates of benthic cover and substrate characteristics and (2) swath transects to estimate the density of kelps and macroinvertebrates. This metadata record documents the swath surveys for the South Coast Baseline Program subtidal community surveys of of kelp and shallow reef ecosystems. Swath sampling consists of recording the number of selected invertebrate and algal species on 2m x 30m transects. Swath surveys are conducted annually in the summer. To assure that the entire kelp forest is sampled representatively, benthic transects are stratified across the face of the reef (alongshore and cross-shore). Within each cross-shore ‘zone’, two to three randomly located transects are sampled along isobaths (constant depth) parallel to shore. The zones at each site are stratified in a manner similar to the fish survey transects, and designed to encompass the offshore edge of the reef, the middle of the reef, and as shallow inshore as practical. Data are included for the years 2011 and 2012. More information and additional data can be obtained at http://piscoweb.org (link is external).

无脊椎动物与藻类调查包含两个组成部分，均沿相同样线开展采样：(1) 采用统一点接触法（uniform point contact，UPC）估算底栖覆盖度与底质特征；(2) 开展条带样带调查以估算海带与大型无脊椎动物的密度。本元数据记录针对南海岸基线计划的海带与浅礁生态系统潮下带群落调查中的条带样带调查进行了说明。条带采样指在2米×30米的样线上记录选定的无脊椎动物与藻类物种的数量。条带样带调查于每年夏季开展。为确保对整片海带林进行具有代表性的采样，底栖样线会沿礁体表面（沿岸与跨岸方向）进行分层布设。在每个跨岸“分区”内，会沿与岸线平行的等深线（恒定水深）布设2至3条随机位置的样线开展采样。各采样点的分区布设方式与鱼类调查样线一致，其覆盖范围涵盖礁体的离岸边缘、礁体中部以及尽可能靠近岸的浅水区。本次数据集包含2011年与2012年的采样数据。更多信息与补充数据可通过http://piscoweb.org 获取（外部链接）。