Fig. 1. Effects of parasitism by Cotesia congregata on diet consumption and growth of the host Manduca sexta given a dietary choice. Nutrient consumption is shown as a bivariate plot of protein and carbohydrate consumption. Values are means ± least-squares S.E.M.; horizontal bars refer to protein diet and vertical bars to carbohydrate diet. Values followed by different letters are statistically different for protein diet or carbohydrate diet, indicated by the directional error bar. Triangles and lower case letters refer to Experiment 1, where larvae were fed for 2 days. Circles and upper case letters refer to Experiment 2, where larvae were fed for 3 days. Growth for the two experiments is shown in the accompanying bar graph. Newly moulted normal (filled bars) and parasitized (open bars) fifth-instar larvae were given a choice of two synthetic artificial diets, one containing sucrose without casein, and the other, casein without sucrose, both nutrients at 120 g l–1. All values are g wet mass. Data were analyzed by ANCOVA with initial mass as the covariate. For a statistical summary, see Table 1.
