Invertebrate Drift in Two Streams of the Kunashir Island (Kuril Archipelago)
The parameters of the drift and quantitative indicators of zoobenthos in streams of the island, which is a part of the Kuril Archipelago, have been estimated for the first time. Hydrobionts drifting during the daylight are smaller than those drifting in the dark, that can be the consequence of food selectivity of the visually oriented drift-feeding fishes. Since the upstream movement of zoobenthos contributes to obtaining of overestimated coefficients of the specific drift rate, it is proposed to use a value of drift rate during one exposure of driftnet for their calculation.