MATERIALS AND METHODS
To evaluate these hypotheses, we first analysed the phenotypic trajectories of three D. pulex genotypes along a gradient of predation risk, focusing on the magnitude, direction and shape of the change in multivariate trait space. Second, we performed modularity and integration tests to evaluate the head-body and dorsal-ventral hypotheses mentioned above. In the following, we introduce the study system, data and design before details on the above process.