Abstract
The ant populations of the Lamto savanna have been studied during the rainy season of 1965. The distribution and number of ant colonies is mainly influenced by the soil conditions. In tropical ferrugineous soils, the dominant species is Campanotas acvapimensis, while Pheidole sp. is more abundant in the damp and sandy areas. In valleys a number of forest species (Odontomachus troglodytes, Psalidomyrmex sp.) are found, extending from the gallery forest. The black clays are inhabited by the same species as the tropical ferrugineous soils, but their relative abundance is different. On the average, about 7000 ant colonies per hectare are found in the Lamto savanna. Table V gives the maximum and average colony sizes of 12 species. Colony size in small Ponerine ants is much smaller than in larger species.
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