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16 results for “Asian tiger mosquito”
Fig. 1 in Mitochondrial Cytochrome Oxidase I Variation In Asian Tiger Mosquito (Aedes Albopictus): Determination Of The Different And Multiple Introduction Situations In Türkiye
Fig. 1. Collection points of A. albopictus samples used in the study
Data from: Cold adaptation in the Asian tiger mosquito’s native range precedes its invasion success in temperate regions
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Data from: Rapid adaptation to novel climate at the northern range edge of the invasive Asian tiger mosquito Aedes albopictus: a moving target
1. Rapid adaptation in response to novel environments can facilitate species invasions and range expansions. Understanding how invasive disease vectors rapidly evolve to novel conditions—particularly at the edge of its non-native range—has important implications for mitigating the prevalence and spread of disease. 2. Here, we evaluate the role of local adaptation in overwintering capability of the Asian tiger mosquito, Aedes albopictus. This species invaded the Southern US in the 1980s and rapidly spread northward into novel climate compared to its native range. Photoperiodically induced egg diapause is a key trait contributing to the establishment and spread of Ae. albopictus in temperate latitudes, and diapause incidence rapidly developed a cline along a latitudinal gradient in the US shortly after its initial invasion. However, variation in overwintering survival of diapause-induced eggs along this gradient is not known, but is critical to the fitness-related role of diapause evolution in the establishment and spread of Ae. albopictus in its northern US range. 3. Using reciprocal transplants, we detected local adaptation in overwinter survival of diapausing Aedes albopictus eggs. In northern range-edge winters, eggs produced by range-edge individuals survived better than those produced by range-core individuals. Diapause eggs from range-edge and range-core locations survived equally well in range-core winters, and no eggs survived a winter beyond the current northern range limit in the US. 4. Synthesis and applications. These results demonstrate rapid (~ 3 decades) local adaptation of egg diapause, a key trait facilitating overwinter survival and range expansion for the invasive Asian tiger mosquito. In light of these results, control efforts could shift from targeting satellite populations to a focus on preventing dispersal into locally adapted, range-edge locations and to aim removal efforts towards areas surrounding locally adapted populations. Adopting new approaches to target rapidly adapting populations will require large-scale collaboration among control agencies and research institutions, and should begin in the northern US range to better control Ae. albopictus mosquito populations in the face of rapid adaptation.
FIGURE 2 in The Asian tiger mosquito, Aedes (Stegomyia) albopictus (Skuse), a vector of dengue, chikungunya and zika viruses, reaches Portugal (Diptera: Culicidae)
FIGURE 2. Portuguese Aedes albopictus females seeking human blood. Note characteristic scutal white stripe, distinct silvery-white scales on the maxillary palpi and tarsi, as well as narrow scales over the wing root and silvery-white basolateral abdominal tergal markings.
FIGURE 1 in The Asian tiger mosquito, Aedes (Stegomyia) albopictus (Skuse), a vector of dengue, chikungunya and zika viruses, reaches Portugal (Diptera: Culicidae)
FIGURE 1. Distribution of Aedes albopictus in the Iberian Península. In green, distribution in Spain according to Collantes et al. (2016). In red, highlighted by arrow, new occurrence in Portugal.
FIGURE 3 in The Asian tiger mosquito, Aedes (Stegomyia) albopictus (Skuse), a vector of dengue, chikungunya and zika viruses, reaches Portugal (Diptera: Culicidae)
FIGURE 3. Biting activity of Ae. albopictus assessed by human-bait catches. Specimens arriving to bite were captured every 15 minutes to avoid recapture. The x axis is a timeline of 15-minute intervals; the y axis is an average of the three days of sampling.
Genomic shifts, phenotypic clines and fitness costs associated with cold-tolerance in the Asian tiger mosquito
<p>Climatic variation is a key driver of genetic differentiation and phenotypic traits evolution, and local adaptation to temperature is expected in widespread species. We investigated phenotypic and genomic changes in the native range of the Asian tiger mosquito, <em>Aedes</em> <em>albopictus</em>. We first refine the phylogeographic structure based on genome-wide regions (1,901 double-digest restriction-site associated DNA single nucleotide polymophisms [ddRAD SNPs]) from 41 populations. We then explore the patterns of cold adaptation using phenotypic traits measured in common garden (wing size and cold tolerance) and genotype–temperature associations at targeted candidate regions (51,706 exon-capture SNPs) from nine populations. We confirm the existence of three evolutionary lineages including clades A (Malaysia, Thailand, Cambodia, and Laos), B (China and Okinawa), and C (South Korea and Japan). We identified temperature-associated differentiation in 15 out of 221 candidate regions but none in ddRAD regions, supporting the role of directional selection in detected genes. These include genes involved in lipid metabolism and a circadian clock gene. Most outlier SNPs are differently fixed between clades A and C, whereas clade B has an intermediate pattern. Females are larger at higher latitudes yet produce no more eggs, which might favor the storage of energetic reserves in colder climates. Nondiapausing eggs from temperate populations survive better to cold exposure than those from tropical populations, suggesting they are protected from freezing damages but this cold tolerance has a fitness cost in terms of egg viability. Altogether, our results provide strong evidence for the thermal adaptation of <em>A</em>. <em>albopictus</em> across its wide temperature range.</p>
Data from: High-throughput sequencing of transposable element insertions suggests adaptive evolution of the invasive Asian Tiger Mosquito towards temperate environments
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Data from: Rapid adaptation to novel climate at the northern range edge of the invasive Asian tiger mosquito Aedes albopictus: a moving target
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Genomic shifts, phenotypic clines and fitness costs associated with cold-tolerance in the Asian tiger mosquito
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Data from: Epigenetic alterations and decreasing insecticide sensitivity of the Asian tiger mosquito Aedes albopictus
A range of environmental factors, including chemicals, can affect epigenetic processes in organisms leading to variations in phenotype. Thus, epigenetics displays an important environmentally responsive element. The transgenerational impact of environmental stressors on DNA methylation and phenotype was the focus of this study. The influence of two known DNA methylation-changing agents, the phytoestrogen genistein and the fungicide vinclozolin, on the overall DNA methylation level in the Asian tiger mosquito Aedes albopictus was investigated. The experiment comprised four generations in a full life-cycle design with an exposed parental generation and three consecutive non-exposed offspring generations. Application of the methylation agents to the parental generation of the study led to an alteration of the global DNA methylation level of the exposed individuals and those in two subsequent generations. The phenotypic variability of the offspring generations was assessed by examining their insecticide sensitivity. Here, a significant decrease in sensitivity (p<0.01) towards the model insecticide imidacloprid revealed alterations of the mosquito's phenotype in two subsequent generations. Thus, the evaluation of A. albopictus from an epigenetic perspective can contribute important information to the study of the high adaptability of this invasive disease vector to new environments, and its underlying mechanisms.
Differential impacts of environmental yeasts on larval development and oviposition behavior of the Asian tiger mosquito Aedes albopictus
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Data from: Epigenetic alterations and decreasing insecticide sensitivity of the Asian tiger mosquito Aedes albopictus
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Evaluation of non-invasive dsRNA delivery methods for the development of RNA interference in the Asian tiger mosquito Aedes albopictus
<p>The Asian tiger mosquito Aedes albopictusis one of the most invasive species and an efficient vector of<br>several pathogens. RNA interference (RNAi) has been proposed as an alternative method to control<br>mosquito populations by silencing the expression of genes that are essential for their survival. However,<br>the optimal delivery method for dsRNAs to enhance an optimal RNAi remains elusive and comparative<br>studies are lacking. We have, therefore, compared the efficiency of three non-invasive delivery methods to<br>mosquito larvae: soaking, rehydration and nanoparticle ingestion. Each method was tested separately on<br>four genes predicted to code non-essential proteins (i.e. collagenase-like, kynurenine 3-monooxygenaselike, yellow-like and venom serine protease-like) in order to be able to compare the importance of gene<br>knock-down.<br>All tested methods successfully downregulated mosquito gene expression. However, silencing efficiency<br>strongly varies among methods and genes. Silencing (95.1%) was higher for Kynurenine 3-<br>monooxygenase-like with rehydration and nanoparticle ingestion (61.1%). For the Venom serine proteaselike, the most efficient silencing was observed with soaking (74.5%) and rehydration (34%). In contrast,<br>the selected methods are inefficient to silence the other genes. Our findings also indicate that gene copy<br>numbers, transcript sizes and GC content correlate with the silencing efficiency.<br>From our results, rehydration was the most specific and efficient methods to specifically knock-down<br>gene expression in Ae. albopictus larvae. Nevertheless, considering the observed variability of efficiency is<br>gene-dependent, our results also point at the necessity to test and optimize diverse dsRNA delivery<br>approaches to achieve a maximal RNAi efficiency.</p>
Population structure of the invasive Asian tiger mosquito, Aedes albopictus, in Europe
<p>Genotype data for "Population structure of the invasive Asian tiger mosquito, <em>Aedes albopictus</em>, in Europe"</p>
Transcriptome profiling reveals potential core genes involved in metabolic detoxification of malathion in Asian tiger mosquito, Aedes albopictus
GEO Series GSE217289. Aedes albopictus. 20 samples. Type: Expression profiling by high throughput sequencing.
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