Invasive plant species as a cause of delay of restorative succession
E. G. Sakharova1, I. Yu. Feniova2, Z. I. Gorelysheva3, M. Rzepecki4, I. Kostshevska-Shlakovska5, A. V. Krylov1, N. S. Zilitinkevicz6
1I. D. Papanin Institute for Biology of Inland Waters of RAS, Borok, Russia
2A. N. Severtsov Institute of Ecology and Evolution of RAS, Moscow, Russia
3NPC NAS of Belarus on Bioresources, Minsk, Byelorussia
4Nencki Institute of Experimental Biology, MikoЕ‚ajki, Poland
5University of Warsaw, Warsawa, Poland
6A. M. Obukhov Institute of Atmospheric Physics of RAS, Moscow, Russia
Keywords: фитопланктон, зоопланктон, рыбы, мезотрофные и эвтрофные воды, уровень N : P, phytoplankton, zooplankton, fish, mesotrophic and eutrophic waters, N : P ratio
Abstract
In the experiment to study impact of trophic conditions, the activity of zooplankton and fish on phytoplankton structure was shown, at the beginning of the experiment the species and size structure of algae was determined by the N: P ratio. Independently of “top-down” control, this determined the dominance of diatoms, dinoflagellates and chrysophytes algae in mesotrophic conditions, while in eutrophic - cyanobacteria. Further in all variants of the experiment the differences in the ratio N: P were leveled, the phytoplankton was dominated by large filamentous green algae. Fish weakened the press of zooplankton for phytoplankton and contributed to the increase in biomass available for zooplankton diatoms, this is most clearly manifested in eutrophic conditions.
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