Fig 1. Compartmental model representation.

The five life-stages of susceptible (SS), heterozygous (SR) and resistant (RR) mosquitoes are represented by rectangular boxes which are arranged in columns according to its genotype. Arrows connecting two boxes represents mosquitoes of a specific life stage maturing into another life stage, with the appropriate transition rate. Outward arrows represent removal of individuals from that specific life stage due to natural death. The thicker trifurcated arrow connecting the Parous stage to the Egg stage boxes represents an influx of eggs arising from random, non-preferential mating of parous winged mosquitoes. The Intra-specific Competition box represents a logistic type competition among larvae. Parameters are given in Table 1.