Peculiar features of the carnivorous feeding of the round-leaved sundew Drosera rotundifolia L.

Sundew, a representative of a group of more than 600 species of insectivorous plants, is a pioneer in the development of these territories with extreme conditions. The purpose of the work is to determine the species composition of insects in the catches of sundew and to identify the features of their disposal by a predator plant. In laboratory conditions, when analyzing long-term video recordings, it was established that the frequency of occurrence per 1 hour of recording and on the 1 leaf at 2021 turned out to be 0,091±0,017, at 2022 it was 0,179±0,040. From the analysis of laboratory observations, it follows that the dewdrop uses soil invertebrates as food objects, including springtails. There is an assumption that such nutrition is not only a laboratory phenomenon, but also occurs in the natural living conditions of the sundew.To verify this assumption, a photograph was taken of the growing area of the sundew in the Vishenskoye swamp of the State Natural Biosphere Reserve Kerzhensky. In the course of the analysis of the photographs, the number of small and large objects on each leaf of the sundews was leaked. Objects comparable in size to the heads and tentacles of a sundew were considered small. Large objects were considered those that remove from a quarter of the surface of the leaf to its entire surface. According to the results of the analysis of photographs in 2021, it turned out that small objects are found with a frequency of 0,850±0,032 on the plant and 0,142±0,015 on the leaf. Large objects – 0,493±0,041 on the plant and 0,083±0,014 on the leaf. According to the results of the analysis of photographs in 2022, small objects are found with a frequent 0,836±0,041 on the plant and 0,191±0,010 on the leaf, and large objects are found with a frequency of 0,504±0,035 on the plant and 0,117±0,009 on the leaf. In this way, in laboratory and field conditions, we were able to show that roundleaf sundew uses not only croup-flying insects as food objects, but also soil arthropods.

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