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28 août 2019
- doi: 10.4000/books.irdeditions.28644
- isbn: 9782709915236
- eisbn: 9782709925280
https://www.openedition.org/12554 , info:eu-repo/semantics/openAccess
Mots-clés
Insecticides assessment River blindness Blackfly Aquatic insect larvae West Africa protection de l’écosystème méthode de lutte vecteur milieu aquatique onchocercose insecticide chimique Côte d’Ivoire Surveillance parasite larve insecticide biologique Environmental Studies NAT011000 RNKSujets proches
Africa, Western Western Africa West AfricaCiter ce document
L. Yaméogo et al., « Long-term assessment of insecticides treatments in West Africa: aquatic entomofauna », IRD Éditions, ID : 10.4000/books.irdeditions.28644
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Résumé
For the control of the Onchocerca volvulus vector in West Africa, up to 18,000 km of rivers from 1975 and up to 50,000 km from 1989 had been partly sprayed weekly with insecticides as part of the Onchocerciasis Control Programme (OCP). To evaluate the possible short-term and long-term effects of the application of insecticides on the nontarget fauna, an aquatic monitoring programme was set up during the initial phase of the programme. By analysing the in vertebrate data, which were collected using various sampling strategies from four different countries between 1977 and 1996, this paper evaluates the long-term changes of the invertebrate populations with respect to their taxonomic composition as well as their trophic structures. The discussed results of the applied numerical analysis strategy suggest that neither the taxonomic nor the trophic structures are greatly altered from the range of biological, flow-related variation that normally occurs in the studied river Systems. This allows us to conclude that the biological variation found here is ecologically acceptable. © 2001 Elsevier Science Ltd. All rights reserved.