Recent years have seen significant progress in understanding the impact of host community assemblage on disease risk, yet diversity in disease vectors has rarely been investigated. Using published malaria and mosquito surveys from Kenya, we analyzed the relationship between malaria prevalence and multiple axes of mosquito diversity: abundance, species richness, and composition. We found a net amplification of malaria prevalence by vector species richness, a result of a strong direct positive association between richness and prevalence alongside a weak indirect negative association between the two, mediated through mosquito community composition. One plausible explanation of these patterns is species niche complementarity, whereby less competent vector species contribute to disease transmission by filling spatial or temporal gaps in transmission left by dominant vectors. A greater understanding of vector community assemblage and function, as well as any interactions between host and vector biodiversity, could offer insights to both fundamental and applied ecology.

Understanding the blood‐feeding behavior of Anopheles gambiae Giles sensu stricto (Diptera: Culicidae) is important to the control of this malaria vector. Whereas the mosquito's decision to initiate blood feeding under different physiological states is well‐studied, its decision to terminate a blood meal in the face of a defensive host has received little attention. In light of this, we assayed the response of females when disturbed during a blood meal, in a size‐energy state factorial experiment. We found that a mosquito's decision to abandon its host is dependent not only on its relative blood intake, but also on its size and energy state. In particular, mosquitoes are more likely to terminate feeding with increasing relative blood meal size, with the exception of small, high‐energy ones, on which they tend to continue feeding. Mosquitoes that have engaged in prediuresis also tend to abandon their host more readily than those that have not. We discuss our results with regards to the marginal returns in fitness (via fecundity) of continuing feeding for body size, energy state, and interactions.

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