Reef fish abundance raw data

In 2013, reef fish community was accessed by visual census using lineal transects of 50 m. For the shallow depths (0-8 m, 9-15 m, 16-22 m, 24-30 m), the transects were extended in four directions (north, south, east and west) from the center of the sample area, for an area of 200 m2. The data was registered at two meters of distance from each side of the transect, where all fish individuals were recorded. The deepest transects (34-40 m, 44-50 m, 54-60 m, 64-70 m) were extended in one direction with an area of 50 m2, due to the geomorphology of the diapiric domes and restrictions of dive time. The shallow ranges of depth were made in 14 sites and the deep ranges in 3 of the 14 sites sampled. To avoid oversampling by the two observers, when an individual was crossing at the same time in the range of vision, only one of the observers counted the individual. Data was analyzed calculating the abundance per m2 due to the differences in the total areas sampled between shallow and deepest zones (See main manuscript).

2013年，研究人员采用50米直线样带目视普查法对礁鱼群落开展了调查。针对浅水区（0~8 m、9~15 m、16~22 m、24~30 m），样带以采样区域中心为起点，沿北、南、东、西四个方向延伸，采样总面积达200平方米。研究人员对样带两侧各2米范围内的全部鱼类个体进行了数据登记。受底辟穹丘的地貌特征及潜水时长限制，深水区样带（34~40 m、44~50 m、54~60 m、64~70 m）仅沿单一方向延伸，采样面积为50平方米。浅水深梯度样带共布设14个采样点，深水深梯度样带则仅在14个采样点中的3个开展采样。为避免两名观测者出现重复计数，当某条鱼类个体同时处于两名观测者的视野范围内时，仅由一名观测者对其进行计数。鉴于浅水区与深水区总采样面积存在差异，研究人员通过计算单位面积丰度的方式对数据进行分析（详见主论文）。