Iskanje po repozitoriju

Opis: Native to East Asia, the Asian bush mosquito (Aedes japonicus) has recently expanded its global range, with established invasive populations in Europe and North America. Given its potential role as a vector of various arboviruses, understanding its invasion process and ecological dynamics is crucial for managing its spread and mitigating public health risks. In the Iberian Peninsula, the species was first detected in Asturias in 2018 and has since expanded to neighbouring regions. Here, we elucidate the invasion pathways and possible origins of Ae. japonicus populations in Spain using sequence data and microsatellite markers, and by screening for the presence of maternally transmitted bacteria of the genus Wolbachia. We analysed 635 Ae. japonicus from 14 countries, including Japan (native range), the United States, and 12 European countries. No clear association between haplotypes and geographical location was detected in any of the three genes analysed (nuclear ITS2, mitochondrial COI and ND4). Wolbachia was not detected in any of the screened samples. In contrast, microsatellite-based population structure analyses showed that most Spanish samples clustered closely with those from College Park, Maryland (USA), located near the Port of Baltimore, one of the largest ports in the United States and a recognised gateway for invasive species introductions. Northern Spain hosts major seaports such as Bilbao and Gijón, whereas the nearest established Ae. japonicus population in Europe lies over 1,000 km away in northeastern France. Taken together, these findings suggest that the most plausible invasion route of Ae. japonicus into Spain involves maritime transport from the eastern coast of the United States to northern Spanish ports, likely accompanied by additional minor introductions of European origin. The inclusion of additional microsatellite loci originally developed for Ae. albopictus yielded results consistent with those obtained using Ae. japonicus-specific loci, reinforcing the robustness of the observed patterns. This work provides new insights into the invasion process of Ae. japonicus in Europe and highlights the need for continuous monitoring and tailored interventions at key ports of entry.
Ključne besede: Aedes, invasive mosquitoes, invasion genetics, northern Spain, points of entry, wsp marker
Objavljeno v RUP: 26.08.2026; Ogledov: 247; Prenosov: 5
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Objavljeno v RUP: 18.02.2026; Ogledov: 655; Prenosov: 7
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Opis: Background With the worldwide spread of the Asian tiger mosquito, Aedes albopictus, the number of autochtho‑ nous cases of exotic arboviral diseases, such as dengue or chikungunya, is increasing in temperate regions. In Europe, pyrethroids are the only insecticides allowed for the abatement of adult mosquitoes and are thus crucial for limiting ongoing arbovirus transmission. Despite this and the report of resistance rising in vector populations worldwide, information on the pyrethroid resistance status of vector populations and knowledge on resistance mechanisms is widely lacking. Genotyping of knockdown resistance (kdr) mutations situated within the target site of pyrethroids, i.e., the voltage‑gated sodium channel (VGSC), and associated with pyrethroid resistance, is a cost‑effective approach to investigate the spread of resistance in a population. Herein, we describe the European‑wide distribution of two kdr mutations, i.e., I1532T and F1534C, in Ae. albopictus and evaluate their co‑occurrence with another well‑characterized kdr mutation, V1016G. Methods Genotyping of the kdr mutation F1534C was performed by allele‑specific PCR for 1732 Ae. albopictus specimens sampled in 19 European countries; for a subset of 419 specimens mutation I1532T was also genotyped by sequencing. For all samples, information on mutation V1016G was available, allowing evaluation of the co‑occur‑ rence of kdr alleles. Results Mutation 1534C was detected in nine sites from six countries at an overall frequency close to 5%. High‑ est frequencies per site were detected in Cyprus (84%) and Greece (45%). Allele 1532 T was identified in 11 sites from 7 countries at frequencies ranging from 4% to 25% per site. Co‑occurrence of different kdr alleles (1534C, 1532 T and 1016G) was observed in nine sampling sites from seven countries. Conclusions The present study offers the first map of the occurrence of the major Ae. albopictus kdr alleles across Europe and highlights a differential distribution of the two alleles most strongly associated with pyrethroid resistance, 1016G and 1534C. Our findings also point to the need for enhancing resistance monitoring in the East‑ ern Mediterranean region, where the two mutations are shown to exist in geographically close areas, with the risk of emergence of highly resistant double mutants.
Ključne besede: mosquito, Aedes albopictus, insecticide resistance, Kdr, arbovirus vector, vector control, Europe
Objavljeno v RUP: 05.01.2026; Ogledov: 781; Prenosov: 11
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Opis: Climate and land-use changes influence the transmission of vector-borne diseases by affecting the distribution and survival of disease vectors. Numerous diseases are transmitted by phlebotomine sand flies (Diptera: Psychodidae: Phlebotominae), including leishmaniasis. Several major sand fly-borne diseases are responsible for high global disease burdens and high socio-economic costs. In Europe, over 20 known sand fly vector species are largely confined to the Mediterranean Basin, yet records of sand fly presence further north increase. Global warming is predicted to drive the spread of sand flies to large areas of Europe in the 21th century, an effect likely to be exacerbated by anthropogenic factors. However, the constraints to the geographic distributions of sand flies are not well understood. This study aims to increase the understanding of the drivers of the geographic distributions of sand flies, using species distribution modelling to systematically test links between sand fly occurrences and climatic, land-use, lithological, biodiversity and human population variables in Europe and adjacent Mediterranean regions. We found that moisture is the most important environmental variable both in explaining and in predicting sand fly occurrences. The projected suitable habitats are larger than the current known sand fly distributions, and these habitats are expected to expand due to changes in climate and land-use.
Ključne besede: climate change, land-use, moisture, phlebotomine sand fly, species distribution modelling, suitable habitat
Objavljeno v RUP: 06.11.2025; Ogledov: 933; Prenosov: 10
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Ključne besede: komarji, temperatura, vlažnost, korelacija, podnebje, diplomske naloge
Objavljeno v RUP: 17.09.2025; Ogledov: 825; Prenosov: 20
Celotno besedilo (1,94 MB)