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Traits d'histoire de vie et démographie du moustique Aedes caspius (Pallas, 1771) (Diptera : Culicidae) : impact des traitements larvicides.

Abstract : Aedes caspius is widely distributed in Europe and breeds in a variety of places. This species has an economical importance due to a huge nuisance, sometimes more than 300 bites per 15 min. For more than 40 years mosquito populations have been controlled along the French Mediterranean coast with larvicide treatments using chemical and biological insecticides. Despite a significant decrease of nuisance since the beginning of treatments, high larval densities of Ae. caspius are still frequently observed. These high larval densities are not due to resistance as the sensitivity to insecticides has not changed. Therefore this species may have developed demographic mechanisms to compensate the effect of larvicide treatments.
The demography of Ae. caspius is described and its evolution under the pressure of control treatments is estimated. The life cycles of two populations, one treated and the other untreated, are compared. Life history traits, such as mortality, stage durations and fecundity, were measured under laboratory and field conditions. Probabilities of passage from one stage to the next, stage durations and mortality are stage-dependent. Sex-ratio, fecundity and stage durations are density-dependent. Larvicide treatments induce a decrease in abundance which induces an increase in fecundity, and a change of sex-ratio in favour of males. These density dependence mechanisms may explain the high larval densities still observed.
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https://tel.archives-ouvertes.fr/tel-00202734
Contributor : Alexandre Carron <>
Submitted on : Tuesday, January 8, 2008 - 9:01:11 AM
Last modification on : Tuesday, January 8, 2008 - 9:36:43 AM
Long-term archiving on: : Friday, November 25, 2016 - 8:48:41 PM

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  • HAL Id : tel-00202734, version 1

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Alexandre Carron. Traits d'histoire de vie et démographie du moustique Aedes caspius (Pallas, 1771) (Diptera : Culicidae) : impact des traitements larvicides.. Ecologie, Environnement. Université Paul Valéry - Montpellier III, 2007. Français. ⟨tel-00202734⟩

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