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Communication incl. Poster: BibTeX citation key:  Akoudjin
Akoudjin, M., Bouyer, J. & César, J. 2009. Validation of the use of fruit feeding insects as ecological indicators in savannah areas. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: roussot 2009-11-23 19:40:57
Categories: Environment and Climate Monitoring, Society-Environment-Climate interactions
Keywords: Agriculture, Vegetation
Creators: Akoudjin, Bouyer, César
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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The clearing and deforestation between 1950 and 1990 have deeply changed the land in several regions of Burkina Faso, which has undoubtedly affected the community of frugivorous insects. Their survival depends on the existence of their host plants and the others factors. Actually, the degradation of natural vegetation causes a change in biodiversity. Given the current issues on the sustainable management of natural resources, an evaluation and monitoring tool for health of savannah ecosystems is essential. One way to monitor ecosystems is the study of insects as ecological indicators.
In this study, the apparent densities (ADT) of Nymphalidae and Cetoniidae species previously described as ecological indicators, were compared in Koro, to confirm their usefulness to characterize savannah ecosystem health by comparing landscape with various anthropogenic pressures. The comparisions were achieved at various seasons and during two years to define precise their condition of use. Five species of Nymphalidae and Cetoniidae were selected to compare the landscapes. Previous results obtained in the W regional Park were used as control of natural savannahs.
The seasonal and inter-annual comparison of ADT of ecological indicators within the same landscape was done to test their temporal variability. The differences of the ADT were significant between the beginning and the end of rainy seasons but not between the two trapping years. In Koro, the ADT of the four savannah species were higher in the pastoral than in the cropping area. The ADT C. viola and P. marginata which are favoured by a moderate opening of the vegetation were higher in the pastoral area of Koro than the W park, but significantly dropped in the cropping areas.
The study confirmed the usefulness of these species as ecological indicators, and a higher impact of cropping than pasturizing on ecosystem health. These results for landscape management are discussed.
Added by: roussot