Abstract:
Objective: To identify the mosquito species collected in the field
of 8 cities/counties of Hainan province, China and to analyze
the characteristics of genetic differentiation of the predominant
mosquito species. The types, contents and composition
characteristics of the midgut microbiota of various mosquito species
were explored to provide evidence for the control and prevention of
mosquito-borne diseases in Hainan province.
Methods: Adult mosquitoes were collected in the field using light
traps, human lure or cattle lure methods. Morphology and DNAbarcoding technology (COI gene) were applied to identify the
mosquito species. The V3-V4 hypervariable region of microbes
16S rRNA was used for high-throughput sequencing of the midgut
microbiota, and SPSS 21.0 and R v3.1.1 software were employed
to perform statistical analysis of the sequencing results and the Beta
diversity analysis.
Results: Aedes (Ae.) albopictus, Armigeres (Ar.) subalbatus and Culex
(Cx.) pipiens pallpens were the three predominant species of the
mosquito samples. Ae. albopictus was closely related to MK736660
(India) and JQ235749 (Yunnan), while MT541282 (DF, Dongfang)
was a relatively independent population. The composition and
structure of bacterial communities significantly varied among most
of the samples (P<0.05). At the genus levels, 16 genera overlapped
in the midgut in Ae. albopictus, 20 in Ar. subalbatus and 26 in Ar.
subalbatus. Besides, Ae. albopictus, Ar. subalbatus and Cx. pipiens
pallpens shared 15 out of the 16 overlapping genera.
Conclusions: Ae. albopictus, Ar. subalbatus and Cx. pipiens pallpens
were close within the same species in Hainan. The main exchange
of mosquito species occurs within Hainan province, but also occurs
across provincial or even national boundaries. The gut microbiota of
mosquito species collected from the same sites were similar. Most
of the core bacteria found in the midgut of Ae. albopictus were also
present in Ar. subalbatus and Cx. pipiens pallpens, indicating that
the breeding environment of Ae. albopictus may cover the breeding
environment of Ar. subalbatus and Cx. pipiens pallpens.