Morphological variability in lake and river populations of Cottus poecilopus Heckel, 1836 (Pisces: Cottidae)
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Witkowski,A.
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Pensoft Publishers
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Morphological variability in both population types of Cottus poecilopus Heckel was shown on the basic of study on 316 specimens from 11 lakes and 6 mountain rivers. Rheophilous populations have better developed features related to locomotion; in limnophilous populations cephalic and truncal canals of lateral line are partly reduced. The differences between river and lake populations of Cottus poecilopus involve adaptations to their respective habitats.