Zusammenfassung
Interspecific competition has rarely been demonstrated infield studies. For it to occur a resource must be in limited supply and potential competitors must be concurrently active in time and space. We studied the availability of plant litter during the course of the year and the activity and distribution of macro-detritivores (termites, diplopods and earthworms) in two habitats in a Guinea ...
Zusammenfassung
Interspecific competition has rarely been demonstrated infield studies. For it to occur a resource must be in limited supply and potential competitors must be concurrently active in time and space. We studied the availability of plant litter during the course of the year and the activity and distribution of macro-detritivores (termites, diplopods and earthworms) in two habitats in a Guinea savanna (Cote d'Ivoire), to test whether interspecific competition might be important. Plant litter was limited during the rainy season in the savanna, but was never limited in the gallery forest. The termite Macrotermes bellicosus, the dominant macro-detritivore in this area, and other detritivorous termites (e.g. Microtermes spp.. Ancistrotermes spp., Odontotermes spp.) were active all year round with a peak during the rainy season, when diplopods and earthworms were also active. In the savanna at the beginning of the rainy season when food became limiting, other detritivorous termite species were more active in the absence of M. bellicosus than in its presence. This complementary activity pattern of M. bellicosus and other termites indicates that interspecific competition among detritivorous termites may be occurring. However, the spatio-temporal distribution of diplopods and earthworms suggests that interspecific competition with M. bellicosus is of minor importance.
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