R. Bergstrom et C. Skarpe, The abundance of large wild herbivores in a semi-arid savanna in relation to seasons, pans and livestock, AFR J ECOL, 37(1), 1999, pp. 12-26
Large herbivores, including livestock and ostrich, were counted alone a 200
-km long track in south-western Kalahari. Botswana. Altogether, 37 counts w
ere made during different seasons. The number of animals seen and group siz
e were recorded. These variables were compared with monthly and accumulated
rainfall (number of animals and group size) and distance to pans (number o
f animals). Observations of game and livestock were also related to distanc
e to villages. In four of the seven studied species, most animals were seen
during the wet season. Group size also varied between seasons apart from t
he non-gregarious steenbok and duiker, Number of animals and group size wer
e in some cases correlated with rainfall during the month of observation or
with accumulated rainfall during the preceding months. The various species
were more often observed close to pans than further away from the pans. Co
mpared to livestock. game was on average observed >10 km further au ay from
the villages. Few observations of game were made between village centres a
nd the livestock observations most distant from the village.