Intraspecific variation in desiccation survival time of <i>Aedes aegypti</i>
 (L.) mosquito eggs of Australian origin

Faull, Katherine J.; Williams, Craig R.

doi:10.1111/jvec.12167

Cited by 67 publications

(55 citation statements)

References 31 publications

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“…partial closed or open septic tanks, drainages, abandoned/unused swimming pools and drainage chambers (32,87,88). Flavivirus genus of arboviruses was isolated from Culex quinquefasciatus mosquitoes further supporting that these mosquitoes are vectors of an array of arboviruses and is consistence with other studies (3,80).…”

Section: Discussionsupporting

confidence: 73%

Urban ecology of arboviral mosquito vectors along the Kenyan coast

Karisa

Muriu

Omuoyo

et al. 2019

Preprint

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Background:The emergence and re-emergence of arboviral infections particularly Chikungunya, dengue hemorrhagic fever, rift valley fever, and yellow fever in humans around the world threatens global health and security. The purpose of this study was to determine the urban ecology of the common arboviral mosquito vectors in urban Coastal Kenya areas. Materials and Methods:The current study was conducted in urban settings of Kilifi and Mombasa counties in coastal Kenya in 2016 to 2017. Adult mosquitoes were collected both indoors and outdoors by CDC light traps and BG-Sentinel traps respectively. All blood fed mosquitoes were tested for blood meal sources by an Enzyme Linked Immunosorbent Assay (ELISA). Mosquito larvae were collected using standard dippers and pipettes. Egg survivorship in dry soil was evaluated by collecting of soil samples from dry potential breeding habitats, watering them for hatching and rearing of the eventual larvae to adults. Mosquitoes were screened for Flavivirus, Alphavirus, and Phlebovirus arboviruses using Reverse Transcriptase quantitative Polymerase Chain Reaction (RT qPCR).Results: A total of 3,264 adult mosquitoes belonging to ten species of Culex, Aedes and Anopheles were collected. Overall, the predominant species were Cx. quinquefasciatus 72.4% (n=2,364) andAe. aegypti, 25.7%, (n=838). A total of 415 breeding habitat types were identified indoors (n=317) and outdoors (n=98). The most productive habitat types in both indoors and outdoors were: assorted small containers, water tanks, drainages, drums and jericans. Overall, 62% (n=18) of the soil samples collected from the two sites (Kilifi and Malindi) were positive for larvae which were used as proxy to measure the presence of eggs. The mosquitoes had high preference for human blood (29.81%) and chicken (3.73%) but none had fed on either goat or bovine. Of 259 mosquitoes tested for viral infection, 11.6% were positive for flavivirus only.Conclusion: Domestic and peri-domestic containers were identified to be the key breeding areas of arboviral vectors. Therefore, efforts should be put in place targeting the productive habitat types.

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Section: Discussionsupporting

confidence: 73%

Urban ecology of arboviral mosquito vectors along the Kenyan coast

Karisa

Muriu

Omuoyo

et al. 2019

Preprint

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“…Humidity levels of ∼70% and high dewpoints over the surface of the water in rainwater tanks suggests that the air cavity may protect mosquito lifecycle stages when conditions outside are unfavourable. It is likely that these conditions may protect eggs and adults from desiccation stress during periods of low humidity that occur during Australian winters (36, 37).…”

Section: Discussionmentioning

confidence: 99%

Life on the margin: rainwater tanks facilitate overwintering of the dengue vector,Aedes aegypti, in a sub-tropical climate

Trewin

Darbro

Zalucki

et al. 2019

Preprint

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1 Life on the margin: rainwater tanks facilitate 2 overwintering of the dengue vector, Aedes aegypti, in a sub-3 tropical climate. Abstract 23 A key determinant of insect persistence in marginal habitats is the ability to tolerate 24 environmental extremes such as temperature. Aedes aegypti is highly invasive and little is 25 known about the physiological sensitivity of the species to fluctuating temperature regimes at 26 the lower critical threshold. This has implications that limit establishment and persistence of 27 the species in sub-optimal regions. Daily winter temperatures were measured in common 28 Australian larval habitats, replicated in environmental chambers, and used to investigate the 29 effect of fluctuating temperatures on the development and survival of tropical and subtropical 30 strains of Australian Ae. aegypti. Development was slow for all treatments but both strains 31 were able to complete development to the adult stage, suggesting previous models 32 underestimate the potential for the species to persist in eastern Australia. Results suggested that 33 thermal buffering in large volume habitats, and water that persists for greater than 32 days, will 34 facilitate completion of the life cycle during sub-tropical winters. Furthermore, we provide a 35 non-linear estimate of the lower critical temperature of Ae. aegypti that suggests the current 36 threshold may be incorrect. Our study demonstrates that the current re-introduction of water 37 storage containers such as rainwater tanks, into major Australian population centres will 38 increase the risk of Ae. aegypti establishment by permitting year-round development south of 39 its current distribution.40 Keywords: Aedes aegypti, Australia, survival and development, temperature fluctuation, water 41 storage, rainwater tank, thermal buffering. 42 Introduction 43 A key determinant of insect distribution and persistence is the ability of a species to tolerate 44 micro-climates at a local scale (1). Conditions within the core distribution of a species will be 45 near-optimal and less stable populations will persist around the margins of an insect's 3 46 distribution; the permanency mediated by access to food sources, the availability of suitable 47 oviposition and resting sites and the abiotic factors associated with these micro-habitats (2-4).48 In recent years there has been renewed interest in predicting the spread of the mosquito Aedes 49 aegypti (L.) into cool range margins, primarily due the increased variability in temperature and 50 rainfall associated with climate change and the importance of the species as a disease vector 51 (4). In particular, rising temperatures, unpredictable rainfall and urban landscapes that are 52 evolving in response to climatic changes may impact mosquito distributions, daily activity 53 patterns and peak annual population abundance in marginal habitats (2, 3, 5-8).54 Aedes aegypti is a highly anthropophilic species (2, 9). The continuous availability of 55 oviposition sites and blood meals afforded by intra-domi...

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“…Similarly, in Australia, quiescent Ae. aegypti eggs remained viable for more than a year with a hatching rate of approximately 2–15%, allowing its dispersion to new locations [133]. Species inhabiting forests have been shown to be less resistant to changes in humidity.…”

Section: Introductionmentioning

confidence: 99%

Diapause and quiescence: dormancy mechanisms that contribute to the geographical expansion of mosquitoes and their evolutionary success

et al. 2017

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Mosquitoes are insects belonging to the order Diptera and family Culicidae. They are distributed worldwide and include approximately 3500 species, of which about 300 have medical and veterinary importance. The evolutionary success of mosquitoes, in both tropical and temperate regions, is due to the various survival strategies these insects have developed throughout their life histories. Of the many adaptive mechanisms, diapause and quiescence, two different types of dormancy, likely contribute to the establishment, maintenance and spread of natural mosquito populations. This review seeks to objectively and coherently describe the terms diapause and quiescence, which can be confused in the literature because the phenotypic effects of these mechanisms are often similar.

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Intraspecific variation in desiccation survival time of Aedes aegypti (L.) mosquito eggs of Australian origin

Cited by 67 publications

References 31 publications

Urban ecology of arboviral mosquito vectors along the Kenyan coast

Urban ecology of arboviral mosquito vectors along the Kenyan coast

Life on the margin: rainwater tanks facilitate overwintering of the dengue vector,Aedes aegypti, in a sub-tropical climate

Diapause and quiescence: dormancy mechanisms that contribute to the geographical expansion of mosquitoes and their evolutionary success

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