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Morphological and genetic variation of Cottus populations in Korea were compared to each other in the watershed. Morphological variation was analyzed by meristic and morphometric characters, and by fertilized egg sizes. Genetic variation was assessed by amplified fragment length polymorphism (AFLP) ...

Morphological and genetic variation of Cottus populations in Korea were compared to each other in the watershed. Morphological variation was analyzed by meristic and morphometric characters, and by fertilized egg sizes. Genetic variation was assessed by amplified fragment length polymorphism (AFLP) fingerprinting. Cottus koreanus populations of rivers and streams running towards the eastern coasts of the Korean Peninsula were significantly different in morphometric characters from populations in rivers and streams running towards the western and southern coasts of the Korean Peninsula, but did not differ in meristric characters and fertilized egg sizes. Cottus populations in the upper streams-Yangyangnamadae Stream, Jusu Stream and Samcheogosip Stream-were the same in meristic and genetic characters. However, the Cottus sp. population from Baebong Stream is related to C. hangiongensis in meristic characteristics and to C. koreanus in the morphometric characteristics of length of the ventral fin ray and in the fertilized egg size. Pairwise genetic distances assessed by the AFLP method among C. koreanus populations were in the range of 0.110 to 0.221. Genetic distances between C. hangiongensis and C. koreanus populations varied from 0.542 to 0.621, and those between the Cottus sp. population of Baebong Stream and C. koreanus populations from 0.222 to 0.304. The result of the UPGMA dendrogram shows the Cottus sp. population of Baebong Stream was clearly separated of other C. koreanus populations.

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