3.1.1 Warthog numbers from distance sampling and habitat
preference
Using the Distance software, data for the years, 2013-2018 were
analysed. The years 2013 and 2018 produced interpretable results. The
estimation of the number of warthogs in NGR were n =632, 95%
confidence interval=[490,815]95% and n =383,
CI=[271, 541]95% respectively. This suggests a
population ranging between 400 and 500 warthogs , i.e. 3-5
individuals/km2 in NGR. Table 2 shows the raw counts
of warthogs along the transects for each year. Warthogs had a
significant preference for water areas compared to other vegetation
types (1-way ANOVA P= 0.002).