Abstract
ABSTRACT We characterized the summer habitat frequented by the channel darter (Percina copelandi) in the Gatineau River and the Richelieu River of southwest Quebec. Water velocity was the only explicative variable the two rivers had in common. The channel darter showed a strong preference for environments with mean water velocities between 39 and 48 cm.s−l. Moreover, the presence of periphyton in the Gatineau River, presenting high substrate heterogeneity, and the presence of woody debris and plant cover in the Richelieu River were linked to the occurrence of the channel darter.
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