Vertical redistribution of drifting benthic invertebrates in the Kedrovaya River, Primorsky Region of Russia
- 1 Institute of Biology and Soil Sciences, Russian Academy of Sciences, Vladivostok, Russia;
- 2 Institute of Biology and Soil Sciences, Russian Academy of Sciences, Vladivostok, Russia;
Abstract
The vertical distribution of morphologically different drifting invertebrates (mayfly and dipteran larvae) in a small salmon river was studied. Drifting invertebrates were caught with the Astakhov’s sampler equipped with three driftnets placed one above another. The average annual drift rate in different levels of a water column was practically the same, while the drift density decreased from the bottom to the surface. Over the course of 24 hours, the drifting organisms did not show clear preference for a particular water layer. Invertebrates were constantly redistributed between the upper and lower levels at approximately 30 - 90 min intervals. This redistribution appears to be linked to the fact that invertebrates of the same taxa, which entered into water column from different bottom sites become active at different times.
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