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

多机构岩相潮间带网络（Multi-Agency Rocky Intertidal Network, MARINe）全年在从阿拉斯加东南部至墨西哥的诸多调查点位开展长期监测与生物多样性调查。其中，长期监测调查用于评估单点位内的群落随时间推移的变化；生物多样性调查则旨在捕捉不同点位间的群落结构模式，即物种丰度与空间分布特征。二者协同，为北美太平洋沿岸岩相潮间带群落的结构与动态提供了丰富的研究数据。
本元数据记录针对MARINe生物多样性调查中的样方（Quadrat）调查工作进行说明。
生物多样性调查包含四个组成部分，所有采样均沿同一套样带布设：(1) 采用点接触法估算潮间带覆盖度与底质特征；(2) 利用带状样带法估算海星与鲍鱼的种群密度；(3) 通过样方采样法估算移动无脊椎动物的种群密度；(4) 开展地形测量，即相对于平均低潮面（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至少30米的连续岩质滩涂。样方采样的具体流程为：在从高潮带延伸至低潮带的11条不同长度的样带上，布设33个0.5m×0.5m的样方，记录其中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移除受关注保护物种的相关数据，同时剔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中描述的数据集的更多信息，请访问pacificrockyintertidal.org。
本数据集引用的加州海洋保护区（Marine Protected Area, MPA）长期边界与项目信息表格，可在此处作为独立数据集获取：https://opc.dataone.org/view/doi:10.25494/P6V884