Supplement 1. Data files to be used with annotated R code presented in Appendix E.

File List DentInfections.txt – data on infections in Daphnia dentifera DentPulInfections.txt – data on infections in both Daphnia pulicaria and Daphnia dentifera Description Appendix E presents R code for analyzing infection prevalence in Daphnia pulicaria and Daphnia dentifera, using data contained in DentInfections.txt and DentPulInfections.txt. In DentInfections.txt: (1) Lake = Lake name (2) Year (3) ParaSp = Parasite species (4) HostSp = Host species (5) Percent = Maximum percent infection (6) Trans = Arcsin square root transformation of maximum proportion infected (7) ParNum = Parasite species, unique number assigned to each species from column 3 (8) HostNum = Host species, 1 = dentifera (9) LakeNum = Lake, unique number assigned to each lake in column 1 (10) N = Number of individuals in sample on date of maximum infection prevalence (11) Ninf = Number of infected individuals in sample on date of maximum infection prevalence In DentPulInfections.txt: (1) Lake = Lake name (2) Year (3) ParaSp = Parasite species (4) HostSp = Host species (5) Percent = Maximum percent infection (6) Trans = Arcsin square root transformation of maximum proportion infected (7) ParNum = Parasite species, unique number assigned to each species from column 3 (8) HostNum = Host species, 1 = dentifera, 2 = pulicaria (9) LakeNum = Lake, unique number assigned to each lake in column 1 (10) N = Number of individuals in sample on date of maximum infection prevalence (11) Ninf = Number of infected individuals in sample on date of maximum infection prevalence