Développement de peuplements de moustiques (Diptera, Culicidae) dans des ouvrages de techniques alternatives de gestion des eaux pluviales : Exemple de la Métropole de Lyon

Abstract : Sustainable urban stormwater management leads to the use of stormwater control measures (SCMs). These techniques have several advantages (limitation of flooding risks, multi-functional added values...) but lead to the construction of structures that can accommodate diversified communities. Adverse biodiversity can generate conflicts between inhabitants and water managers. The mosquitoes present in the stormwater management structures were studied in the Lyon Metropolis on SCMs (two green roofs and 15 retention and/or infiltration basins), 7 swales, 20 gullies pots with sand traps part of traditional pipe networks. The devices were sampled from May to November 2016. No mosquitoes were found in green roofs, swales did not retain water long enough and four non-pathogenic vectors species were found in the retention and/or infiltration basins: Culex pipiens (79.6% of individuals), Culiseta longiareolata (15.4%), Culex hortensis hortensis (3.9%) and Anopheles maculipennis sensu lato (1.1%). An increasing frequency was observed from May to July (90% of the water habitats were colonized over the period) followed by a decrease until November (20% of the habitats). Systems where water was drained properly (such as green roofs, infiltration basins drying up in less than 5 days) were not found to be significant breeding sites. Mosquitoes appeared as early as May in devices where water remains (such as sediment traps at the bottom of the basins) and proliferated during the summer. Gully pots with sand traps were found to be highly colonized by 3 species: Culex pipiens (80.3%), Culiseta longiareolata (8.7%) and Aedes albopictus (the “tiger mosquito”, a potential viral vector, 11%). Thus, SCMs, when properly designed (slope, complete emptying in less than 24 hours) and well maintained do not present a risk of dangerous mosquito proliferation.
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Submitted on : Tuesday, May 14, 2019 - 10:10:53 AM
Last modification on : Thursday, July 11, 2019 - 10:36:07 AM

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M. Valdelfener, E. Sibeud, L. Bacot, G. Besnard, Y. Rozier, et al.. Développement de peuplements de moustiques (Diptera, Culicidae) dans des ouvrages de techniques alternatives de gestion des eaux pluviales : Exemple de la Métropole de Lyon. Techniques Sciences Méthodes , ASTEE/EDP Sciences, 2018, pp.55-71. ⟨10.1051/tsm/201804055⟩. ⟨hal-02128211⟩

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