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Background  The bacterial communities associated with mosquito eggs are an essential component of the mosquito microbiota, yet there are few studies characterizing and comparing the microbiota of mosquito eggs to other host tissues.    Methods  We sampled gravid female  Culex pipiens  L. and  Culex restuans  Theobald from the field, allowed them to oviposit in the laboratory, and characterized the bacterial communities associated with their egg rafts and midguts for comparison through MiSeq sequencing of the  16S  rRNA gene.    Results  Bacterial richness was higher in egg rafts than in midguts for both species, and higher in  Cx pipiens  than  Cx. restuans . The midgut samples of  Cx. pipiens  and  Cx. restuans  were dominated by  Providencia. Culex pipiens  and  Cx. restuans  egg rafts samples were dominated by  Ralstonia  and  Novosphingobium , respectively. NMDS ordination based on Bray-Curtis distance matrix revealed that egg-raft samples, or midgut tissues harbored similar bacterial communities regardless of the mosquito species. Within each mosquito species, there was a distinct clustering of bacterial communities between egg raft and midgut tissues.    Conclusion  These findings expand the list of described bacterial communities associated with  Cx. pipiens  and  Cx. restuan s and the additional characterization of the egg raft bacterial communities facilitates comparative analysis of mosquito host tissues, providing a basis for future studies seeking to understand any functional role of the bacterial communities in mosquito biology.

Culex pipiens and Culex restuans egg rafts harbor diverse bacterial communities compared to their midgut tissues