Vector survival

In addition to the larvae, gonotrophic and sporogonic cycles, temperature also plays a role in determining the mortality of vector. High air temperatures increase vector mortality, but the relationship is uncertain, especially at the high and low temperature bounds of transmission. As in the larvae cycle, two schemes are incorporated in the VECTRI model to permit a multi-model approach, with constants given in table 1:

Scheme 1: follows [#!martens:95a!#,#!martens:95b!#] and gives the survival rate as a quadratic function of temperature:

$$P_{V,surv1}=K_{mar1,0}+K_{mar1,1}T_{2m} + K_{mar1,2} T^2_{2m}$$ (8)

Scheme 2: follows [#!martens:97!#,#!craig:99!#], revising the relationship as

$$P_{V,surv2}=exp \left( \frac{-1.0}{K_{mar2,0}+K_{mar2,1}T_{2m} + K_{mar2,2} T^2_{2m}} \right )$$ (9)

The results in this paper are obtained using scheme 2, referred to in [#!ermert:11b!#] as Martens II.