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Abstract <p>The summer (July–August) zooplankton in the Kama and Votkinsk reservoirs has been studied for the previous decade (2014–2023). The species list also includes archive data from 2012 to 2013. There are 149 taxa in two studied bodies of water, four of them registered for the first time. The distribution of the Caspian invader <i>Cercopagis pengoi</i> is shown and patterns of mass development of the North American rotifer <i>Kellicottia bostoniensis</i> are detected. It is found that abundance is mostly provided by Rotifera (43%) and Copepoda (32%), while 73% of the biomass is formed by Cladocera in the Kama Reservoir. Rotifera form 53% of the number in Votkinsk Reservoir, while Cladocera form 77% of biomass there. The mean abundance of summer zooplankton in the Kama Reservoir in studied period is 120 ± 6 thousand ind./m<sup>3</sup>; it equals 115 ± 8&#xa0;thousand ind./m<sup>3</sup> in the Votkinsk Reservoir. Pluriannual changes in species composition, structure, abundance, and peculiarities of spatial distribution of zooplankton are discussed.</p>

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Structure and Distribution Peculiarities of Summer Zooplankton in the Kama and Votkinsk Reservoirs

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • E. M. Tselishcheva,
  • V. V. Bezmaternykh

摘要

Abstract

The summer (July–August) zooplankton in the Kama and Votkinsk reservoirs has been studied for the previous decade (2014–2023). The species list also includes archive data from 2012 to 2013. There are 149 taxa in two studied bodies of water, four of them registered for the first time. The distribution of the Caspian invader Cercopagis pengoi is shown and patterns of mass development of the North American rotifer Kellicottia bostoniensis are detected. It is found that abundance is mostly provided by Rotifera (43%) and Copepoda (32%), while 73% of the biomass is formed by Cladocera in the Kama Reservoir. Rotifera form 53% of the number in Votkinsk Reservoir, while Cladocera form 77% of biomass there. The mean abundance of summer zooplankton in the Kama Reservoir in studied period is 120 ± 6 thousand ind./m3; it equals 115 ± 8 thousand ind./m3 in the Votkinsk Reservoir. Pluriannual changes in species composition, structure, abundance, and peculiarities of spatial distribution of zooplankton are discussed.