MARINe/PISCO: Intertidal: MARINe Coastal Biodiversity Surveys: Point Contact Surveys Summarized

This metadata record documents the Point Contact surveys for the Multi-Agency Rocky Intertidal Network (MARINe) Coastal Biodiversity Surveys. Point Contact sampling consists of recording the diversity and abundance of invertebrates and algae along 11 transects of variable length extending from the upper intertidal to the low intertidal. Intertidal 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)). Intertidal coastal biodiversity surveys are conducted throughout the year at sites ranging from Southeast Alaska to Baja California, Mexico. Selected sites are resampled on a 3-5 year cycle. A site is defined as a contiguous rocky bench of at least 30m. 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

本元数据记录针对多机构岩相潮间带网络（Multi-Agency Rocky Intertidal Network, MARINe）海岸生物多样性调查中的点位接触（Point Contact）调查进行说明。点位接触采样法指沿从潮间带高潮区延伸至低潮区的11条长度各异的样带，记录无脊椎动物与藻类的物种多样性及丰度。潮间带调查共包含4项采样模块，均沿上述同一条样带开展：(1) 潮间带盖度与底质特征的点位接触估算；(2) 条带样带法估算海星与鲍的种群密度；(3) 样方采样法估算移动性无脊椎动物的种群密度；(4) 地形测量（相对于平均低低潮位的高程，单位为米，即mllw）。海岸潮间带生物多样性调查全年开展，调查点位覆盖从美国阿拉斯加东南部至墨西哥下加利福尼亚州的区域。入选调查点位每3至5年进行一次重采样。单个调查点位被定义为至少30米长的连续岩滩。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长期海洋保护区（Marine Protected Area, MPA）边界与项目信息表可作为独立数据集通过以下链接获取：https://opc.dataone.org/view/doi:10.25494/P6V884