<p> FIN1 FIN2 PL1 CZ1 CZ2 CZ3 CZ4 F1 F2 I1 I2 BG1 BG2 E1 Monogenea Gyrodactylus vimbi Schulman, 1953 1 1.67 - 2.86 59.35 13.75 1.33 3 1.33 1 1.75 2.25 39.6 3 2.62 Table S1 List of metazoan parasite species identified in 15 populations of Squalius cephalus in European Rivers. Gyrodactylus lomi Ergens et Gelnar, 1988 - - - 1 3.7 1 - - - 2 - - 2 Gyrodactylus prostae Ergens, 1963 - - - - 2.7 1 - - - 5.6 - - 2.5 - 1.5 Intensity of infection (mean number of metazoan parasites per infected host) for European chub populations. Data on parasite species are from Gyrodactylus gasterostei Gläser, 1974 - - - - - 1.5 1 3 - - - - 3.9 - 2 GyrodactylusSeifertová gracilihamatuset al. (2008). Malmberg, 1964 - - - 1 4 - - 1 - 1 - - - - - Gyrodactylus katharineri Malmberg, 1964* ------2 ------Dactylogyrus vistulae Prost, 1957 - 1.6 - 29.6 6.16 8.13 3.3 2.5 10.69 12.21 1.75 7.82 22.9 8.82 4.61 Dactylogyrus fallax Wagener, 1857 - - - 3 3.17 1.67 ------Dactylogyrus folkmanovae Ergens, 1956 3.61 3.43 - 15.65 14.25 6.29 40.83 3.59 2.38 1.43 2.3 30.8 16.22 - 1 Dactylogyrus prostae Molnár, 1964 1.83 1.64 - - 1.57 4.92 7.24 5 - 5.41 4.12 48.2 - - 29.6 Dactylogyrus nanoides Gussev, 1966 - - - - 3.5 1.61 3.87 3.71 - - - 3.27 - - 1.33 Dactylogyrus vranoviensis Ergens, 1956 - - - - 5.0 1.25 2.69 1.75 - - 1.33 5.52 1.67 - - Dactylogyrus naviculoides Ergens, 1956* ------6 - - - - - Dactylogyrus spp. - - - 3.16 4.5 3.5 7.87 1.5 - 2 - 10.42 2.86 - - Paradiplozoon megan (Bychowsky et Nagibina, 1959) - - - 3.67 - 1 1.5 - 2 4.41 2.55 - - 1 1 Paradiplozoon homoion (Bychowsky et Nagibina, 1959) - - 1 - - 1.5 ------1 2 2.28 Crustacea Lamproglena pulchella Nordmann, 1832 ------1 2 - 1.33 1.87 1.93 3.31 - - Ergasilus sieboldi Nordmann, 1832* - - - - - 1 ------Argulus coregoni Thorell, 1864 1 1.25 ------1 1 - - - - Argulus foliaceus (Linnaeus, 1758)* ------2 - Lernaea sp. juv.* ------1.5 - Hirudinea Piscicola geometra (Linnaeus,1761) - 1 - 2.33 ------Codonobdella truncata Grube, 1873* ------1 - - - - Mollusca Glochidia spp. (larv.) 9.91 13.63 - - 1 1 - - - - 1 12.33 1.33 - - Trematoda Diplostomum sp. larv. 15.95 6.42 8.35 - 1.2 2.43 2.5 2.67 2.75 2 - - - - - Tylodelphys sp. larv. 14.25 6 - - - - 1.5 6 - 1 - - - - - Apharyngostrigea sp. larv.* ------12 - - - - - Rhipidocotyle campanula larv. (Dujardin, 1845) 4.5 43.54 - - - 192.46 - - - - - 142.71 3 - - Ichthyocotylurus platycephalus larv. (Creplin, 1852)* - 2 ------Posthodiplostomum sp. larv. - - 20.43 ------1 - - - Bucephalus polymorphus larv. Baer, 1827 - - - - - 96.23 - - - - - 1 - - - Metagonimus yokogawai larv. Katsurada, 1912* - - - 1.67 ------Apharyngostrigea cornu larv. (Zeder, 1800)* - - - 1 ------Metorchis intermedius larv. Heinemann, 1937 - - 3.15 15.69 ------Paracoenogonimus ovatus larv. Katsurada, 1914* ------3 - - - Sphaerostomum bramae (Müller,1776) - 1 - 8.67 - - - - - 1.2 - - - - - Asymphylodora markewitschi Kulakovskaya, 1947* - - - - - 1.5 ------Asymphylodora imitans (Mühling,1898)* ------1 - - - - - Allocreadium isoporum (Looss,1894) 14.5 28.27 ------2.14 - -</p>