Table 2 Results of Mann-Whitney U test comparing the differences for each character

Interspecific variations

P. ridibundus × P. kl. P. esculentus

H

H

S

H

H

H

H

H

P. ridibundus × P. lessonae

H

H

H

H

H

H

H

H

P. lessonae × P. kl. P. esculentus

H

H

H

H

H

H

H

H

Population structure

RE × LE

N

H

N

N

S

N

N

H

Sexual dimorphism

P. ridibundus

N

N

N

N

N

N

N

N

P. kl. P. esculentus

N

S

N

N

N

N

N

N

P. lessonae

H

S

H

S

S

H

S

H