The role of light in Chagas disease infection risk in Colombia

Parasites & Vectors

Table 1 Model parameters. Most of the parameters correspond to reported biological and ecological characteristics of R. prolixus included in the model

Symbol	Name	Units	Value	Ref
λ	Birth rate	\( \frac{individual}{day\cdot individual} \)	1.3	[63]
δ _E	Egg mortality rate	1/day	0.001	[63]
δ _N	Nymph mortality rate	1/day	0.004	[64]
δ _A	Adult mortality rate	1/day	Palms: 0.005 Houses: 0.05	[64] -
τ	Residency time from egg to nymph	day	15.4	[63]
γ	Residency time from nymph to adult	day	211	[63]
K _i	Carrying capacity in patch i	individual	Palms: 20 Houses: 1 × 10⁻³	[35, 41, 45]
σ	Maximum per capita migration rate	\( \frac{individual}{day\cdot individual} \)	0.1	-
η	Number of individuals at which half of the maximum per capita migration rate occurs	individual	1 × 10⁻⁶	-
L _ji	Presence of light at destiny patch i seen from patch j	arbitrary units	0,1	-
D _ji	Euclidean distance between patchj and patch i	meter	-	-
	Maximum dispersal distance R. prolixus	meter	200	[46, 65]

σ and η (included in equation 4) were approximated using a simple assumption about the per-capita migration rate of insects in a patch, which also depends on the number of nymphs and adults. L is a matrix that represents which connections, with origin j and destiny i, have light at patch i. Each L _ji takes a binary value 0 (no light) or 1 (light). Accordingly, D is a matrix that represents the distance between connections and D _ji is the Euclidean distance in meters between patch j and i

ISSN: 1756-3305