Russian Federation
Russian Federation
A brief qualitative and quantitative description of the main groups of phytoplankton, zooplankton, and zoobenthos of the Sulak and Terek rivers during the winter-summer period is provided. Research indicated that the qualitative composition and abundance of phytoplankton in the Sulak River increased from winter to summer and from the upper sampling point to the river mouth. Small celled diatoms dominated in all seasons. The basis of the species diversity of zooplankton was composed of copepods and protozoans. The maximum quantitative indicators of animal plankton were recorded in winter, followed by a decrease toward summer. The benthic fauna of the Sulak River during the entire study period was represented by the following groups of invertebrates: worms, crustaceans and insects. The maximum abundance and biomass were observed in the spring, coinciding with intense development of the worm group, particularly oligochaetes. The highest values of the qualitative and quantitative composition of the phytocenosis of the Terek River were noted in the winter period of the study, the lowest values were recorded in the summer. Changes in the biomass and abundance of zooplankton occurred in a stepwise manner, with a reduction in quantitative indicators from winter to spring, followed by an increase in summer. Representatives of worms and insects were found in the zoobenthos of the Terek River throughout all seasons. Favorable conditions for the development of zoobenthos were observed at the mouth and in the middle zone of the study area. The maximum indices of the abundance and biomass of zoobenthos were recorded in the summer due to the development of representatives of the insect group.
phytoplankton, zooplankton, zoobenthos, qualitative composition, abundance, biomass.
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