The first bar chart shows the number of zebras and buffalos and the second bar chart illustrates the annual amount of rain at Nboro Reserve in 4 years from 2005 to 2011
Notably, it is clear that the number of buffalos experienced an upward trend over the past six years, while the amount of rainfall changed from year to year.
In the initial year, we can see buffalo and zebra populations were approximately 40 and 50 individuals respectively. After two years, both buffalos and zebras both had growth, about above 70 zebras and 80 buffalos. However, in 2019 there was a slight decline in the number of zebras,failling to just over 60 individuals, while the number of buffalos increased sharply, reaching over 110 individuals. In the last year of the survey period, both of them rose slightly, with zebras just more than 80 and buffalos at 120.
In terms of yearly rainfall, it started at above 600 milimeters in 2015, recorded as the lowest value in period. In 2007, the amount of rain surged and reached close to 1100 milimeters. Nevertheless, rainfall plummeted to about 700 milimeters in 2009.In the final year, rainfall climbed dramatically from 700 milimeters to 1200 milimeters, hitting the highest value during the period