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Aedes  mosquitoes are considered highly successful global invasive species and vectors of several pathogens of relevance for public health. Their midgut’s microbiota can play an important role in affecting not only their vectorial competence but also their fitness, physiology, food digestion, metabolism, immunity and adaptation to new environmental conditions. Using high-throughput sequencing we compared the microbiota of  Aedes albopictus  collected in Italy with those reported in populations from France and Vietnam. We also analysed  Aedes koreicus  gut microbiota for the first time. We found remarkable individual difference along with common bacterial taxa in both species.  Ae. albopictus  collected in Italy had a lower richness and a different composition of microbiota in respect to specimens collected in France and Vietnam. It also showed a core microbiota formed mainly of bacteria of the genus  Pseudomonas . Overall, the two  Aedes  species ( Ae .  albopictus  and  Ae .  koreicus ) collected in Italy, showed a large core microbiota with 75.98% of the identified Operational Taxonomic Units. Furthermore,  Ae .  albopictus  had 2.5% prevalence of  Wolbachia  and 0.07% of  Asaia  spp, while  Ae .  koreicus  had 14.42% of  Asaia  spp. and no  Wolbachia . This study provides new informations on the spatial variation of the midgut bacterial communities in mosquitoes of medical relevance within areas of recent invasion and provide the basis for further studies aimed at assessing the effects of such variation on vectorial capacity for a range of pathogens.

Reduced diversity of gut microbiota in two Aedes mosquitoes species in areas of recent invasion