Table 2 Metazoan parasite communities in Barbus spp. populations. Mean abundance (A) ± standard deviation (SD) and prevalence (P, in %) of metazoan parasites in B. barbus (BB), B. meridionalis (BM) and their hybrids (H) 

  Myxobolus spp.

–

38

–

66

–

60

–

28

–

21

–

21

  Allocreadium isoporum

0.14 ± 0.36

14

–

–

–

–

2.27 ± 8.25

20

2.57 ± 7.80

31

7.13 ± 22.19

49

  Apharyngostrigea sp.

–

–

0.26 ± 3.07

1

0.28 ± 0.89

12

0.16 ± 1.44

1

1.40 ± 9.10

2

–

–

  Clinostomum complanatum

–

–

0.39 ± 2.77

12

–

–

–

–

–

–

–

–

  Diplostomum spp.

0.14 ± 0.65

5

1.87 ± 6.29

38

0.80 ± 1.53

28

0.12 ± 0.53

7

–

–

–

–

 Echinostomatidae gen. sp.

0.24 ±1.09

5

–

–

–

–

–

–

–

–

–

–

 Digenea fam. gen. spp.

0.05 ± 0.22

5

0.19 ± 2.16

1

–

–

–

–

–

–

–

–

  Holostephanus sp.

–

–

–

–

1.68 ± 4.13

24

0.35 ± 1.69

5

–

–

–

–

  Tylodelphys sp.

–

–

0.10 ± 0.53

5

–

–

0.02 ± 0.22

1

–

–

–

–

  Dactylogyrus sp.

–

–

–

–

–

–

–

–

–

–

0.03 ± 0.16

3

  Dactylogyrus extensus

–

–

–

–

–

–

0.07 ± 0.38

5

0.05 ± 0.22

5

–

–

  Dactylogyrus carpathicus

3.19 ± 14.39

10

57.67 ± 76.65

79

–

–

–

–

–

–

–

–

  Dactylogyrus malleus

81.95 ± 88.38

100

70.14 ± 160.06

90

0.60 ± 2.40

16

0.16 ± 0.70

7

–

–

–

–

  Gyrodactylus hemibarbi

–

–

0.34 ± 0.97

17

0.12 ± 0.43

8

0.63 ± 1.50

20

4.40 ± 6.49

74

2.49 ± 4.23

56

 Gyrodactylus katharineri

–

–

0.06 ± 0.27

6

0.92 ± 1.63

40

0.67 ± 1.10

35

0.52 ± 1.37

24

–

–

  Gyrodactylus markewitschi

3.48 ±10.53

33

20.59 ± 87.32

34

1.12 ± 5.40

8

17.96 ± 80.32

25

6.10 ± 18.82

43

2.82 ± 7.81

41

  Gyrodactylus sprostonae

–

–

–

–

–

–

5.91 ± 50.59

2

81.79 ± 261.36

26

4.00 ± 12.18

26

  Paradiplozoon homoion

–

–

0.23 ± 1.02

12

0.04 ± 0.02

4

0.04 ± 0.19

4

–

–

0.38 ±0.81

23

  Bathybothrium rectangulum

0.90 ± 3.06

19

1.08 ± 3.64

16

6.6 ± 15.52

32

2.02 ± 9.15

19

1.17 ± 2.25

21

0.74 ± 1.27

36

  Schyzocotyle acheilognathi

–

–

0.06 ± 0.37

3

–

–

–

–

–

–

–

–

  Caryophyllaeus brachycollis

–

–

0.01 ± 0.12

1

7.48 ± 22.63

28

0.75 ± 3.43

12

0.05 ± 0.31

2

1.85 ± 6.11

28

  Proteocephalus torulosus

–

–

–

–

–

–

–

–

–

–

0.15 ± 0.59

8

  Contracaecum sp.

–

–

0.30 ± 2.15

8

–

–

–

–

–

–

–

–

  Pseudocapillaria tomentosa

1.00 ± 4.15

10

0.47 ± 2.02

10

0.08 ± 0.28

8

0.75 ± 2.37

21

0.64 ± 2.09

14

0.31 ± 0.61

23

  Rhabdochona hellichi

53.90 ± 67.03

100

14.99 ± 22.15

72

2.56 ± 4.55

48

2.63 ± 9.00

30

2.14 ± 6.33

19

2.23 ±5.72

41

 Nematoda fam. gen. sp. 1

–

–

–

–

–

–

–

–

0.02 ± 0.15

2

0.28 ± 1.32

8

 Nematoda fam. gen. sp. 2

–

–

1.01 ± 12.04

1

–

–

–

–

–

–

–

–

 Nematoda fam. gen. sp. 3

–

–

–

–

–

–

–

–

–

–

313.05 ± 901.63

33

  Acanthocephalus anguillae

0.05 ± 0.22

5

0.25 ±2.04

4

–

–

–

–

–

–

–

–

 Acanthocephala fam. gen spp.

–

–

0.03 ± 0.26

1

–

–

0.15 ± 1.33

1

–

–

–

–

  Pomphorhynchus tereticollis

1.67 ± 4.86

19

7.97 ± 23.56

39

40.36 ± 73.65

44

25.59 ± 39.91

80

20.50 ± 19.95

83

20.62 ± 17.64

95

  Anodonta spp.

0.52 ± 0.68

43

0.15 ± 0.69

6

0.44 ± 0.96

24

0.10 ± 0.46

5

–

–

–

–

  Argulus coregoni

–

–

0.01 ± 0.08

1

–

–

–

–

–

–

–

–

  Ergasilus sieboldi

0.43 ±1.96

5

1.32 ± 5.06

21

–

–

–

–

0.02 ± 0.15

2

–

–

  Tracheliastes polycolpus

–

–

0.17 ± 0.68

10

–

–

–

–

–

–

–

–

  Hydrozetes sp.

–

–

–

–

–

–

0.01 ± 0.11

1

–

–

–

–