Presence of large colonies (>100cm) of the hydrocoral Millepora alcicornis in the coral reef of Tamandaré - Pernambuco, Brazil (Field surveys from Feb2017 to May 2019)

Underwater mapping of hydrocoral Millepora alcicornis was conducted from February 2017 to May 2019, as part of a conjoined, ongoing effort to map the benthic habitats and monitor the coral reefs of the area.Field survey was undertaken using photo and video transects and a diver-towed GPS (Garmin eTrex 20x) recording location data at 5 s intervals.Video recordings were undertaken by a patiently swimming diver using a GoPro coupled on top of a one-meter handle. To enable the estimation of the size of the coral colonies, a measuring tape was attached to a PVC one-dimensional frame. The location of each coral colony was recorded by checking the timestamp of the specific photos and video frames containing the species and syncing it with a digital watch carefully synchronized with the towed GPS.Specimens of Millepora alcicornis were also classified by size. The table shows data related to the species' colonies larger than 100 cm.

2017年2月至2019年5月期间，本团队开展了叶状千孔珊瑚（Millepora alcicornis）的水下测绘工作，作为该区域底栖生境测绘与珊瑚礁监测联合持续项目的一部分。本次野外调查采用照片与视频样带法，辅以潜水员牵引的GPS（Garmin eTrex 20x）以5秒间隔记录位置数据。视频录制由一名从容游动的潜水员完成，其使用安装在1米长手柄顶端的GoPro相机进行拍摄。为实现珊瑚群落尺寸的估算，研究人员将卷尺固定于PVC一维框架之上。通过核查包含该物种的特定照片与视频帧的时间戳，并将其与经精准校准、与牵引式GPS同步的电子手表进行匹配，即可记录每一处珊瑚群落的位置。研究人员同时依据尺寸对叶状千孔珊瑚的样本进行了分类。本数据集表格展示了该物种尺寸大于100厘米的群落相关数据。