Analysis of the effects of rotational larviciding on aquatic fauna of two Guinean rivers: the case of permethrin
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28 août 2019
- doi: 10.4000/books.irdeditions.28794
- isbn: 9782709915236
- eisbn: 9782709925280
https://www.openedition.org/12554 , info:eu-repo/semantics/openAccess
Mots-clés
Permethrin Onchocerciasis Simulium damnosum Aquatic invertebrates 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
Streams Creeks Brooks Runs (Rivers)Citer ce document
G. Crosa et al., « Analysis of the effects of rotational larviciding on aquatic fauna of two Guinean rivers: the case of permethrin », IRD Éditions, ID : 10.4000/books.irdeditions.28794
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Résumé
Within the Onchocerciasis Control Programme about 50,000 km of west African rivers have been regularly sprayed with larvicides to control the vector of dermal filariasis caused by Onchocerca volvulus. Since the beginning of the programme invertebrates and fish data were collected to monitor adverse effects on non-target organisms. The regular series of biological and hydrological data collected in two Guinean rivers were analysed to evaluate the effects of rotational larviciding with particular attention to permethrin, as preliminary acute toxicology tests and semi-field experiments suggest it has stronger effects on non-target fauna in respect to other larvicides. Invertebrates ard fish variations in biomass and species richness are seasonal and flow-related and the results presented here do not support any evidence of specific effects of permethrin application on the biological targets monitored. Larvicide applications influence community structures, putting pressure on some taxonomic groups, causing. for example, the rarefacion of some taxa. In spite of the above results, the scarcity of some invertebrate systematic units does not resuit in a significant reduction of total invertebrate density because of the corresponding increase in other systematic units. In nature the studied aquatic communities would rarely be in equilibrium because of frequent natural stresses, such as drougst and spate events, the biologicai variations discussed are to be considered ecologically acceptable. © 2001 Elsevier Science Ltd. All rights reserved.