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Dosso K.,University dAbobo Adjame Abidjan | Konate S.,University dAbobo Adjame Abidjan | Aidara D.,University dAbobo Adjame Abidjan | Linsenmair K.E.,University of Würzburg
Journal of Tropical Ecology | Year: 2010

At Lamto, little is known about animal community responses to habitat variability resulting from fires and the mosaic pattern of the vegetation in general and in particular about that of termites which play key roles in this ecosystem. With a standardized method, data were collected on termites from four habitats differing in their vegetation cover and fire-history: annually burned savanna, savanna woodland, forest island and gallery forest. A range of environmental variables was measured and correlated with species abundances. The number of termite species collected in the savanna woodland was very close to that found in the gallery forest while the forest island was the richest habitat. The species richness of the savanna woodland and forest island seemed partly due to their heterogeneous and transitional vegetation structures and variable food resources. With regard to the fire-history of habitats, Connell's intermediate disturbance hypothesis offers an explanation for differences in the patterns of habitat-specific species richness. Variation in species abundances was significantly correlated with only two environmental variables (soil pH and woody plant species richness). The pH appeared as the most influential factor for fungus-growers while tree invasion in the savanna strongly reduces the abundance of grass-feeding species (e.g. Trinervitermes geminatus). Although not significantly correlated with species abundances, soil carbon showed a positive correlation with the dominant soil-feeder Basidentitermes potens. As for wood-feeders, they were not strongly correlated with woody plant species richness; this fact might be linked to their use for other sources of nourishment. Overall, it appears that habitat variability in the Lamto reserve contributes to the maintenance of different subsets of the termite community. Copyright © 2010 Cambridge University Press.

Memel J.D.,University dAbobo Adjame Abidjan | Karamoko M.,University dAbobo Adjame Abidjan | Otchoumou A.,University dAbobo Adjame Abidjan | Kouassi D.K.,University dAbobo Adjame Abidjan
Livestock Research for Rural Development | Year: 2011

The study of relationship betweenabundance, size and mortality of snails Achatinidae, on one the hand, and texture and chemical composition of the soil, on the other hand, in the Banco National Park, revealed that the taxa studied have different behaviour. The abundance of Achatina achatina is correlated with soil fines and iron. The abundance of Achatina fulica, Archachatina ventricosa is correlated with soil calcium. Also, their shellfish lengths are correlated with soil fines and iron. Mortality rates Achatina achatina, Achatina fulica and Lignus intertinctus are correlated with soil fines, iron and calcium.

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