Estimation of the Mortalities of the Immature Stages and Adults

Service, M. W.

doi:10.1007/978-94-011-1868-2_10

Cited by 3 publications

(2 citation statements)

References 357 publications

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“…5,6 To estimate the daily survival rates (DSRs) of mosquito populations and the efficacy of new control strategies, suitable methods are required to determine the ages of individual mosquitoes with greater levels of accuracy than those afforded by dissection based methods of mosquito age grading. [7][8][9][10][11] Insect cuticular hydrocarbons (CHs) provide a barrier against dehydration and include a variety of communicationrelated compounds. 12,13 These include sex pheromones, 14,15 signals for task allocation among social insects, 16 and possibly species or caste recognition cues.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Cuticular Hydrocarbons for Determining the Age and Survivorship of Australasian Mosquitoes

Hugo

Kay²,

Eaglesham³

et al. 2006

Am J Trop Med Hyg

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The cuticular hydrocarbon (CH) technique of age grading mosquitoes was evaluated for use on laboratory-reared Aedes aegypti (L.), Anopheles farauti (Laveran), and Ochlerotatus vigilax (Skuse). Gas chromatography/mass spectroscopy was used to determine the relative abundance of five alkanes in hexane extracts from the legs of individual mosquitoes. Age-related changes to relative hydrocarbon abundances were observed from An. farauti and Ae. aegypti, which are vectors of malaria and dengue, respectively. Female An. farauti were classified into two age categories (1-5 and >/= 5 days old at 27 degrees C) and Ae. aegypti into three age categories (1 to < 5, 5 to < 9 and >/= 9 days old at 27 degrees C) based on these changes. However, there was an absence of predicable age-related changes to hydrocarbon abundance in Oc. vigilax. Simulation modeling was used to construct sequential sampling guidelines for the application of this technique to estimate the survivorship of Ae. aegypti and An. farauti populations. These guidelines define the relationship between the survival rate, number of mosquitoes sampled, CH-based predictions of age, and the accuracy of survival rate estimates. They demonstrated, for example, that if 19% of a population of Ae. aegypti is estimated to be >/= 9 days old by CH analysis, an estimate of the daily survival rate from the exponential model should be based on a sample of 200 mosquitoes for the survival rate estimate to be within 5% of the actual rate. However, if only 10% of the population is estimated to be >/= 9 days old, 500 mosquitoes would need to be analyzed for the survival rate estimate to be of equivalent accuracy.

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Section: Introductionmentioning

confidence: 99%

Investigation of Cuticular Hydrocarbons for Determining the Age and Survivorship of Australasian Mosquitoes

Hugo

Kay²,

Eaglesham³

et al. 2006

Am J Trop Med Hyg

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“…Because the ability of female Ae. aegypti to transmit dengue virus is dependent on their age, development of a method to more accurately predict the age of older females would be useful for epidemiological studies and for evaluating the impact of vector control interventions that are intended to prevent disease (Service 1993).…”

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confidence: 99%

Field Validation ofAedes aegypti(Diptera: Culicidae) Age Estimation by Analysis of Cuticular Hydrocarbons

et al. 2004

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In previous studies, we developed linear regression models to age-grade female Aedes aegypti L. reared and maintained under controlled laboratory conditions. The models were based on temporal differences between two cuticular hydrocarbons, pentacosane (C25H52) and nonacosane (C29H60), which were extracted from Ae. aegypti legs and analyzed by gas-liquid chromatography. These initial models predicted adult female age up to 165 DD (12-15 calendar d at 28 degrees C). The age of older mosquitoes, however, could not be accurately predicted. In this study, our original regression models were tested using age data obtained from mosquitoes maintained in a field laboratory and those that were marked, released, and recaptured in northwestern Thailand. Our field data led to the development of two new regression models: one for the cool-dry season (February-March) and one for the rainy season (July-August). Both models resulted in better estimates of age than the original model and thus improved our ability to predict the age of Ae. aegypti to 15 calendar d. Females older than 15 d can be identified as such, but their exact age cannot yet be estimated. The new models will be useful for epidemiological studies and evaluating the impact of Ae. aegypti control interventions for disease prevention.

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Survivorship characteristics of the mosquito Aedes caspius adults from southern France under laboratory conditions

Carron

Bichaud

Platz

et al. 2008

Medical Vet Entomology

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The survivorship characteristics of two populations of Aedes caspius (Pallas) (Diptera: Culicidae) were compared in the laboratory. One population was sourced from Mourgues, where larvicides have been used continuously for approximately 40 years, and the other from Pont de Gau, where there has been no consistent mosquito control. The aims of the study were to ascertain the basic life history profiles of adults and to determine whether continuous larviciding affects inherent adult survivorship. Life tables were constructed to calculate the following life expectancy parameters: mean lifetime (tau(ad)); maximum lifetime (tau(max)), and daily survival rate (p(ad)). All three parameters were higher for females than for males (paired t-test, P < or = 0.001); male mean lifetime, maximum lifetime and daily survival rate were 4.95 +/- 0.94 days, 20.50 +/- 6.66 days and 0.79 +/- 0.05, respectively; female values were 14.74 +/- 3.68 days, 49.69 +/- 16.55 days and 0.93 +/- 0.02, respectively. No differences were found between the two populations, and no correlations were found between initial adult densities and their respective survival rates. The survivorship curves for Ae. caspius were type IV for males (mortality rates higher for young adults) and type III for females (mortality rates constant).

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Estimation of the Mortalities of the Immature Stages and Adults

Cited by 3 publications

References 357 publications

Investigation of Cuticular Hydrocarbons for Determining the Age and Survivorship of Australasian Mosquitoes

Investigation of Cuticular Hydrocarbons for Determining the Age and Survivorship of Australasian Mosquitoes

Field Validation ofAedes aegypti(Diptera: Culicidae) Age Estimation by Analysis of Cuticular Hydrocarbons

Survivorship characteristics of the mosquito Aedes caspius adults from southern France under laboratory conditions

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