Counts of quarter degree grid cells (QDGCs, 15'×15') in the Southern African Bird Atlas Project (SABAP) comparison map for Secretarybirds for 19 April 2013 (Figure 1).

QDGCs are coloured if the species was observed there in either project. Reporting rates are compared using a z-statistic (see text). SABAP2 reporting rates were lower than SABAP1 in red, orange and yellow grid cells, and higher than SABAP1 for light and dark green and blue grid cells (see Figure 1). Pink grid cells are those that had not yet been covered in SABAP2. Therefore, red, orange and yellow grid cells indicate areas of potential conservation concern, whereas green and blue grid cells indicate areas of apparent population increase. Columns labelled with colours give the percentage of the total for that province, with the actual number of QDGCs in parentheses. Columns to the right of the Total column present summaries of reporting rate data not presented in Figure 1 but available in Figure S1.当某一物种在任一项目中于该四分度网格单元（QDGCs）内被观测到时，该单元将被赋予对应颜色。报告率的比较采用z统计量（详见正文）。南非鸟类地图集第二版（SABAP2）的报告率在红色、橙色与黄色网格单元中低于第一版（SABAP1），而在浅绿、深绿及蓝色网格单元中则高于SABAP1（详见图1）。粉色网格单元代表尚未被SABAP2覆盖的区域。因此，红色、橙色与黄色网格单元代表存在潜在保护关切的区域，而绿色与蓝色网格单元则代表种群数量明显增长的区域。以颜色标注的列展示了对应省份的总占比百分比，括号内标注了该省份的QDGCs实际数量。"总计"列右侧的列则汇总了未在图1中展示，但可于补充图S1中获取的报告率数据。