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Universität für Bodenkultur Wien (2016)

Benthic invertebrate assemblages and assessment of ecological status of water bodies in the Sahelo-Soudanian area (Burkina Faso, West Africa)

Kaboré, Idrissa

Titre : Benthic invertebrate assemblages and assessment of ecological status of water bodies in the Sahelo-Soudanian area (Burkina Faso, West Africa)

Auteur : Kaboré, Idrissa

Université de soutenance : Universität für Bodenkultur Wien

Grade : Dr. nat. techn. 2016

Résumé
Efficient monitoring tools to assess how aquatic ecosystems respond to multiple impacts of human activities are urgently needed but still limited in West Africa, especially in Burkina Faso. Comprehensively, this dissertation presents five cumulative scientific publications on the topic "macroinvertebrates in Burkina Faso". The first article describes the diversity, composition and structure of benthic macroinvertebrate communities in semi-arid rivers. We found a high diversity of the benthic invertebrate fauna. The results revealed a strong relationship between some families of dipterans, as well as pulmonate snails and organic nutriments. In the second publication, we investigated the diversity and ecology of diving beetles (Dytiscidae, Noteridae) and water beetles (Hydrophilidae) in Burkina Faso. We ascertain that aquatic vegetation is the major factor inducing the beetles’ richness. A high diversity of water beetles was identified, and 24 species were first records for Burkina Faso. The third study explores the potential use of macroinvertebrate communities for bioassessment in semi-arid area. The results showed that different metrics of diversity, composition and tolerance of macroinvertebrate communities, as well as indicator taxa showed differential sensitivity to different levels of environmental degradation. In the fourth publication, the environmental variables of 44 investigation sites were assessed to identify ’a priori criteria’ in Burkina Faso to describe reference conditions. Therefore an important basis for the development of a bioassessment system based on reference conditions was developed. Finally, in publication 5 we evaluated a multimetric approach to assess the ecological status of water bodies for West African Sahel and upper Sudan ecoregions. Within this thesis new bio-assessment tools for the region were developed. These cost-effective tools can be used to promote a sustainable balance between freshwater ecosystem health and society.

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Page publiée le 4 octobre 2016, mise à jour le 24 juin 2017