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Background  Mosquito surveys that collect local data on mosquito species’ abundances provide baseline data to help understand potential host-pathogen-mosquito relationships, predict disease transmission, and target mosquito control efforts.    Methods  We conducted an adult mosquito survey from November 2017 to March 2019 on St. Kitts, using Biogents Sentinel 2 traps, set monthly and run for 48-h intervals. We collected mosquitoes from a total of 30 sites distributed across agricultural, mangrove, rainforest, scrub and urban land covers. We investigated spatial variation in mosquito species richness across the island using a hierarchical Bayesian multi-species occupancy model. We developed a mixed effects negative binomial regression model to predict the effects of spatial variation in land cover, and seasonal variation in precipitation on observed counts of the most abundant mosquito species observed.    Results  There was high variation among sites in mosquito community structure, and variation in site level richness that correlated with scrub forest, agricultural, and urban land covers. The four most abundant species were  Aedes taeniorhynchus ,  Culex quinquefasciatus ,  Aedes aegpyti  and  Deinocerites magnus , and their relative abundance varied with season and land cover.  Aedes aegypti  was the most commonly occurring mosquito on the island, with a 90% probability of occurring at between 24 and 30 (median = 26) sites. Mangroves yielded the most mosquitoes, with  Ae. taeniorhynchus, Cx. quinquefasciatus  and  De. magnus  predominating.  Psorophora pygmaea  and  Toxorhynchites guadeloupensis  were only captured in scrub habitat. Capture rates in rainforests were low. Our count models also suggested the extent to which monthly average precipitation influenced counts varied according to species.    Conclusions  There is high seasonality in mosquito abundances, and land cover influences the diversity, distribution, and relative abundance of species on St. Kitts. Further, human-adapted mosquito species (e.g.  Ae. aegypti  and  Cx. quinquefasciatus ) that are known vectors for many human relevant pathogens (e.g. chikungunya, dengue and Zika viruses in the case of  Ae. aegypti ; West Nile, Spondweni, Oropouche virus, and equine encephalitic viruses in the case of  Cx. quinqefasciatus ) are the most wide-spread (across land covers) and the least responsive to seasonal variation in precipitation.

Effects of seasonality and land use on the diversity, relative abundance, and distribution of mosquitoes on St. Kitts, West Indies