This annex presents ape population abundance estimates at the level of a protected area and/or its buffer zone, a logging concession or group of concessions, or any discrete area where a survey has taken place in the past two decades. It also lists a few sites that were last surveyed in the 1970s and 1980s.
Most of the estimates are drawn from peer-reviewed publications and “grey” literature (which can include unpublished research, government reports or policy papers), and some have been reconfirmed by experts with access to material not in the public domain (such as raw data and documents produced for third parties that may not be shared in their entirety without permission).
Since records of absolute ape numbers are rarely available, this annex uses abundance classes of population ranges, as defined in Table 1. For the small apes, available density estimates are provided.