Competition between larval populations of O. triseriatus and A. albopictus was assessed by comparing per capita growth rate estimates for experimental cohorts of larvae developing under a variety of initial density combinations in fluid obtained from tires or from treeholes. Estimates of per capita rate of change were calculated. Estimates of carrying capacities and competition coefficients indicate that competition between the two species will result in stable coexistence in treehole communities (below, left), and local extinction of A. triseriatus in tire habitats (below, right). Isoclines, or estimated combinations of each species that permits equilibrium, are shown in the shaded regions. The vertical axis represents the initial density of O. triseriatus, and the horizontal axis shows the initial density of A. albopictus. Crossed isoclines suggest a stable coexistence between the two species.