Figure 3: Relationship between temperature and development for P. ramosa (pink) and D. magna (blue), with D. magna resistotype indicated by shape (square for susceptible, triangle for resistant and circles for ephippia). Points are jittered horizontally to display individual points at the same temperature. D. magna development is represented both by the average number of days until hatching (navy; for ephippia treatments only) and by maturation (royal blue), the average number of days until the first clutch (minus the average number of days until hatching for ephippia treatment) and P. ramosa development is measured by the time from exposure to signs of visible infection in the host. Development times for both species are shortened by increasing temperatures, however the slope is much steeper for parasite than for the host indicating that as temepratures increase, the time between when the host reaches reproductive maturity and when they are castrated by infection is shortened. Line of best fit for P. ramosa was added using the SSasymp function (packgage=stats) with f(x)= 8.815+(498.043-8.815)-1.486(x) and for D. magna the linear model y= —0.838 (x)+ 29.8539 was used for time to eggs and y= —0.7608(x)+20.018.