Abstract
<jats:p>The proposed paper completes the series of publications on the structural and functional organization of the Ola River macrozoobenthos communities in the spatio-temporal aspect. it is for the first time that, in the Far North-East watercourse, the macrozoobenthos community trophic structure and its seasonal and interannual variability were revealed, and possible causes for the latter were formulated. It was established that the hierarchy of trophic groups along the longitudinal profile of the Ola River generally corresponds to the provisions of the river continuum concept. The functional organization of Ola River macrozoobenthos communities is distinguished with the high proportion of collectors-gatherers. The conclusions on the allocation of of the epi-, the meta-, and the hyporithral zone communities, previously made on the basis of their species composition, are confirmed. </jats:p>