How do baboons adjust to an environmental shock?
Résumé
Understanding wildlife behavioural responses to the anthropogenic variables is
paramount to address human-wildlife interactions issues and promoting conservation in
human-dominated landscapes. This study, conducted in 2019, focused on a troop of
chacma baboons (Papio ursinus) named Madiba’s troop which inhabits George Nelson
Mandela University campus situated in the Garden route in South Africa. This region faced
a fire in October 2018 that burnt 86000ha impacting the campus by burning mostly pine
plantation. Our objective was to understand the fire's impact on Madiba's troop behaviour.
We recorded baboon movements to estimate home range size, troop dispersion and any
urban foraging events (UFE) where troop members tried to entered houses or open any
2018 (before fire). The shock experienced by Madiba’s troop led to the departure of half of
the troop whereas new individuals incorporated it leading to a troop being half the size as
before fire. The fire burnt 32% of the home range and led to the arrival of another troop
reducing Madiba’s home range by 53%. Consequently, troop members stayed mainly on
campus to rely on anthropogenic food and performed as much UFE as before fire.
Surprisingly, burnt pine plantation represented 28% of their new home range and troop
members visited more pine plantation than natural forest. This result can be explained by
the cut of the standing pines leading to an easy access to pine nuts. Even if the troop
reduced its home range, it was more scattered than before fire, decreasing the number of
participants in an UFE and thus the risk to be detected but still caused important damages.
Such environmental change in fragmented landscapes increased pressure on urban areas
by the troop worsening perception of baboons by people.