MARINe/PISCO: Intertidal: MARINe Coastal Biodiversity Surveys: Quadrat Surveys Summarized

Long-Term Monitoring and Biodiversity Surveys done by the Multi-Agency Rocky Intertidal Network (MARINe) occur throughout the year at sites ranging from Southeast Alaska to Mexico. Long Term Monitoring surveys assess within-site community change over time, while Biodiversity surveys were designed to capture among-site patterns of community structure (abundance and spatial distribution of species). In combination, the long-term, targeted species approach and the biodiversity surveys provide a wealth of information about the structure and dynamics of rocky intertidal communities along the Pacific Coast of North America. This metadata record documents the Quadrat surveys for the MARINe Biodiversity Surveys. Biodiversity surveys are comprised of four components, all sampled along the same transects: (1) point contact estimates of intertidal cover and substrate characteristics, (2) swath transects to estimate the density of seastars and abalone, (3) quadrat sampling to estimate the density of mobile invertebrates, and (4) topography (elevation relative to mean low low water (mllw)). Selected sites are resampled on a 3-5 year cycle. A site is defined as a contiguous rocky bench of at least 30m. Quadrat sampling consists of recording the number of mobile invertebrate species within thirty-three 0.5m x 0.5m quadrats placed along 11 transects of variable length extending from the upper intertidal to the low intertidal. Please note that species of concern have been removed from all public datasets, as well as data from sites funded by the National Park Service (NPS) and the United States Navy. For a comprehensive dataset, please contact the data set owner(s). For more information about the data described in this metadata record, please visit pacificrockyintertidal.org. The long-term California MPA boundary and project info tables referenced in this dataset can be found as a separate dataset here: https://opc.dataone.org/view/doi:10.25494/P6V884

多机构岩潮间带网络（Multi-Agency Rocky Intertidal Network, MARINe）全年不间断开展长期监测与生物多样性调查，其调查点位覆盖从阿拉斯加东南部至墨西哥的广阔沿海区域。长期监测调查旨在评估单个点位内的群落随时间推移的动态变化，而生物多样性调查则用于刻画不同点位间的群落结构模式，包括物种丰度与空间分布特征。二者协同配合，结合针对性的长期物种采样方案，可为北美太平洋沿岸岩潮间带群落的结构与动态变化提供极为丰富的研究数据。
本元数据记录针对MARINe生物多样性调查中的样方（Quadrat）调查进行归档说明。整套生物多样性调查包含4个核心采样环节，所有环节均沿同一组样线（transect）开展：（1）点接触法估算潮间带覆盖度与底质特征；（2）带状样带法估算海星与鲍鱼的种群密度；（3）样方采样法估算移动无脊椎动物的种群密度；（4）地形测量（即相对于平均低潮低潮位（mean low low water, MLLW）的高程）。
选定的调查点位每3至5年进行一次重采样。调查点位被定义为长度不小于30米的连续岩质滩地。样方采样的具体流程为：在11条长度不等、覆盖从高潮间带到低潮间带范围的样线上，布设33个0.5m×0.5m的标准样方，记录每个样方内出现的移动无脊椎动物物种数量。
请注意，所有公开数据集均已剔除受保护关注物种的相关数据，同时移除了由美国国家公园管理局（National Park Service, NPS）与美国海军资助的调查点位的采样数据。如需获取完整数据集，请联系数据集所有者。如需了解本元数据记录所描述的数据的更多细节，请访问pacificrockyintertidal.org官方网站。
本数据集引用的加利福尼亚州海洋保护区（Marine Protected Area, MPA）长期边界数据及项目信息表，可通过以下链接的独立数据集获取：https://opc.dataone.org/view/doi:10.25494/P6V884