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Background  Host-associated microbes, collectively known as the microbiota, play an important role in the biology of multicellular organisms. In mosquito vectors of human pathogens, the gut bacterial microbiota influences vectorial capacity and has become the subject of intense study. In laboratory studies of vector biology, genetic effects are often inferred from differences between geographically and genetically diverse colonies of mosquitoes that are reared in the same insectary. It is unclear, however, to what extent genetic effects can be confounded by uncontrolled differences in the microbiota composition among mosquito colonies. To address this question, we used  16S  metagenomics to compare the midgut bacterial microbiome of six laboratory colonies of  Aedes aegypti  recently derived from wild populations representing the geographical range and genetic diversity of the species.    Results  We found that the diversity, abundance, and community structure of the midgut bacterial microbiome was remarkably similar among the six different colonies of  Ae. aegypti , regardless of their geographical origin. We also confirmed the relatively low complexity of bacterial communities inhabiting the mosquito midgut.    Conclusions  Our finding that geographically diverse colonies of  Ae. aegypti  reared in the same insectary harbor a similar gut bacterial microbiome supports the conclusion that the gut microbiota of adult mosquitoes is environmentally determined regardless of the host genotype. Thus, uncontrolled differences in microbiota composition are unlikely to represent a significant confounding factor in genetic studies of vector biology.    Electronic supplementary material  The online version of this article (10.1186/s13071-018-2780-1) contains supplementary material, which is available to authorized users.

Diverse laboratory colonies of Aedes aegypti harbor the same adult midgut bacterial microbiome