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The peridomestic species Aedes aegypti (L.), the primary vector of dengue in French Polynesia, is common in urban areas and villages of French Polynesia but less common in more rural settings where Ae. bancrofti found in French Polynesia ( Iyengar 1965, Lardeux et al. polynesiensis, the species is not an important vector of the subperiodic form of W. Although Culex quinquefasciatus Say is common on numerous islands of French Polynesia and shares many developmental habitats with Ae. polynesiensis, nine mosquito species are reported from the Society Archipelago ( Belkin 1962, Huang 1977, Russell 2004, Brunes and Boussès 2009). There is sufficient genetic exchange between Raiatea and its surrounding motus to maintain genetic homogeneity ( Shiu et al. polynesiensis is augmented across short and long distances by commercial trade therefore, genetic differences are influenced by human transport in addition to mosquito flight distances, weather patterns, and natural barriers ( Failloux et al.
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Like many “high islands” of the South Pacific, the lagoon of Raiatea contains several small satellite islands ( motus) associated with the surrounding coral reef. Raiatea is the largest of the Leeward Islands in French Polynesia and serves as the regional administrative and public health center for the western Society Archipelago. The small islands of the archipelago lend themselves to studies of vector biology on replicated sites. The coupling of MDA with effective vector control may be required to upset disease transmission ( Burkot et al. Aedes polynesiensis females are more efficient at transmission (which requires development of the parasite but is nonpropagative in the vector) as the number of ingested microfilariae decreases (as occurs during MDA) ( Rosen 1955, Pichon et al. polynesiensis contributes to the failure of MDA in these archipelagoes despite success elsewhere ( Burkot et al. It has been hypothesized that the biology of Ae. bancrofti, lymphatic filariasis persists in French Polynesia ( Esterre et al. 2005).ĭespite prolonged mass administration of prophylactic drugs (MDA) against W. polynesiensis respond to overcrowding and resource limitation during larval development through reduced survival, skewed sex ratios, and smaller size at emergence and delayed emergence, especially for females ( Mercer 1999, Mercer et al. Like many container-breeding mosquitoes, cohorts of Ae. Aedes polynesiensis uses a variety of natural and artificial containers for development, complicating vector control ( Lardeux et al. Host seeking mostly is diurnal and outdoors, with peaks of activity at dawn and dusk ( Russell 2004). 1965), and a secondary vector of dengue in French Polynesia ( Rosen et al. Differences in vector abundance observed when comparing neighboring motus are likely because of differences in human activity and mosquito suppression.Īedes polynesiensis Marks (Diptera: Culicidae) is the primary vector of Wuchereria bancrofti (Cobbold) (Spirurida: Onchocercidae), the causative agent of human lymphatic filariasis ( Rosen 1955, Laigret et al. Local weather patterns predicted about half the variation in mosquito numbers. Nonetheless, at least on the two highly productive motus, dry-season females had larger wing lengths than their wet season counterparts.
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Significantly more females were captured during the wet season than the dry season. Thus, wing lengths were influenced more by local developmental conditions than overall numbers of adults.
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Shoreline and Horea females had significantly longer mean wing lengths than females from Tiano and Toamaro. polynesiensis females per collection differed among trapping dates and locations, with the majority of females captured on two motus, Horea and Toamaro. Aedes polynesiensis males, Aedes aegypti (L.), and Culex quinquefasciatus Say rarely were collected. Aedes polynesiensis Marks females comprised the overwhelming majority (≈99%) of the three species of mosquitoes captured in Biogent Sentinel traps placed at fixed sites on three small satellite islands ( motus) of the western lagoon and on the shoreline of Raiatea. Adult numbers and sizes of mosquitoes were monitored for 2 yr in neighboring habitats on the western coast of Raiatea (Society Archipelago) in anticipation of testing new vector control technologies.