MCR LTER: Coral Reef: Long-term Community Dynamics: Backreef (Lagoon) Corals Annual Survey, ongoing since 2005

This dataset contains the percentage cover of all stony corals (Scleractinia, pooled among genera) and other major groups analyzed from 0.5 x 0.5 m photographic quadrats at the Backreef habitat at the Moorea Coral Reef LTER, French Polynesia. This survey time series began in 2005 and is repeated each year in April. Functional groups counted are: Scleractinian corals, Macroalgae, Crustose Coralline Algae / Bare Space, Soft Corals, Hydrocorals ( Millepora ), Algal Turf and Sand. The coral community was sampled photographically in all represented habitats surrounding the island: Fringing Reef, Lagoon, and Outer Reef. This dataset contains only Lagoon (Backreef) data (see knb-lter-mcr.4 for the other habitats) and is structured in a repeated-measures protocol to allow a statistical contrast of sites, shores and times. Community structure was determined through a coarse analysis of the benthic community, initially completed in situ (2005), but using photoquadrats from 2006. There are quadrats analyzed at each of five areas within each site, and the areas are revisited (but not the quadrats) each year to support the repeated measures design. There are two tables available, providing different views of the same data: a long table having all values in one column and a wide table having a separate column for each observed object. Detailed methods are available in the protocols section. This material uses data collected by the U.S. National Science Foundation's (NSF) Moorea Coral Reef Long Term Ecological Research (MCR LTER) site under Grant No. OCE 2224354 (and earlier awards). Additional financial support to the MCR LTER site was provided through a generous gift from the Gordon and Betty Moore Foundation. Research was completed under permits issued by the French Polynesian Government (Délégation à la Recherche) and the Haut-commissariat de la République en Polynésie Francaise (DTRT) (Protocole d'Accueil 2005-2024).

本数据集包含法属波利尼西亚茉莉雅珊瑚礁长期生态研究（Moorea Coral Reef LTER）站点背礁生境（Backreef habitat）中，基于0.5×0.5米摄影样方（photographic quadrats）分析得到的所有石珊瑚（Scleractinia，按属合并统计）及其他主要类群的盖度百分比数据。本调查时间序列始于2005年，每年4月重复开展一次。
本次统计的功能类群包括：石珊瑚（Scleractinian corals）、大型藻类（Macroalgae）、壳状珊瑚藻/裸空间（Crustose Coralline Algae / Bare Space）、软珊瑚（Soft Corals）、水螅珊瑚（Hydrocorals，即千孔珊瑚属Millepora）、藻席（Algal Turf）与沙质基质。
本研究曾通过摄影采样覆盖岛屿周边所有代表性生境：岸礁（Fringing Reef）、泻湖（Lagoon）与外礁（Outer Reef），但本数据集仅收录泻湖（即背礁）生境的数据（其他生境数据详见knb-lter-mcr.4）。数据集采用重复测量实验设计（repeated-measures protocol），可支持开展样点、岸带与时间维度的统计对比分析。
底栖群落结构通过粗分辨率分析确定：2005年最初完成原位调查，2006年起改用摄影样方开展分析。每个样点下设5个区域，每个区域均设置分析样方；每年仅重访区域而非原样方，以符合重复测量设计要求。
本数据集包含两张数据表，以两种不同形式呈现同一套数据：一张为长格式表（long table），所有取值均收纳于单一列；另一张为宽格式表（wide table），每类观测对象均对应独立列。详细实验方法详见数据集的方案部分。
本数据集依托美国国家科学基金会（NSF）茉莉雅珊瑚礁长期生态研究（MCR LTER）站点采集的数据完成，相关资助项目编号为OCE 2224354（及此前资助项目）。茉莉雅珊瑚礁长期生态研究站点同时获得了戈登与贝蒂·摩尔基金会的慷慨捐赠资助。本研究开展所需许可由法属波利尼西亚政府研究代表处（Délégation à la Recherche）及法国驻波利尼西亚高级专员公署技术与区域发展部（DTRT，2005-2024年接待协议Protocole d'Accueil 2005-2024）核发。