A. B. Ruchina, G. V. Shlyakhtinb, and O. N. Artaeva
aMordovian State University, ul. Bol’shevistskaya 68, Saransk, 430000, Russia;
e-mail:sasha@ruchin@rambler.ru
bSaratov State University,
ul. Astrakhanskaya 83, Saratov, 410012 Russia
Received September 17, 2007
Abstract—Species composition of fishes was studied in rivers (capture sites) inhabited by the riffle minnow.
In some localities, this species proved to occupy a leading position in the ichthyofauna, being obviously dom-
inant. In small rivers, 16 species were caught together with it, including seven species regularly occurring in
catches. The relative abundance of riffle minnow showed a moderate positive correlation with that of the gud-
geon (0.568) and a nonsignificant negative correlation (–0.399) with that of the bleak. It is probable that the
population dynamics of riffle minnow are determined mainly by natural intraspecific mechanisms rather than
by water quality, which has changed only slightly in the rivers studied.
DOI: 10.1134/S1067413609030084
Key words: fish species composition, Alburnoides bipunctatus, biotopes, population dynamics.
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