Abstract

The reactions of preference and avoidance in response to humic-containing preparation (HCP) have been studied in four species of Baikalian amphipods and in Holarctic Gammarus lacustris Sars, 1863. The differences in the behavioral reactions of amphipods have been revealed. The order of amphipods in terms of the extent of HCP preference is as follows: G. lacustris > Gmelinoides fasciatus Stebbing, 1899 ≥ Eulimnogammarus flavus (Dybowski, 1874). The deepwater Ommatogammarus flavus (Dybowski, 1874) exhibited neither preference nor avoidance reactions in response to HCP. Potential relations between revealed reactions of amphipods, conditions, and depths of their habitats and spread off Lake Baikal are discussed.

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