The 2011 Mayumba National Park elephant survey was conducted using dung counts encountered in recce visits. The dung decay rate was not done on site but it was taken to be 80 days using 14 reviewed studies. Due to the limited information and parameters of the dung decay rate e.g. number of dung piles used, and the use of recce visits instead of systematic transects, the survey was submitted as an informed guess. 2015-10-06 — The reason for change was originally entered as NP, but in fact this estimate replaces (in part) the 1988 estimate for "Rest of Gabon forest range", and so the reason for change has been now corrected to NG. --JB.
Source:Maisels, F. and Strindberg, S. (2012). 'Review of Gabon's elephant status'. Gabon: Wildlife Conservation Society.