THE PHYTOPLANKTON IN TSANKOV KAMAK RESERVOIR

K. Dochin, A. Ivanova

Abstract: The survey of phytoplankton in the Tsankov Kamak Reservoir at two stations from July to October 2015 shows the abundance of 75 taxa of 6 divisions. In the species’ composition dominated Bacillariophyceae (30.7%), and subdominant are the representatives of Cyanoprokaryota (22.7%) and Chlorophyta (20%). Taxonomic similarity between the studied stations was relatively high (0.53), but are established differences in dominant complexes of the phytoplankton. Only at the station in the flow area of the reservoir, dominate species Planktothrix agardhii (Gomont) Anagnostidis & Komárek, Peridinium sp. and Peridinium cinctum (O. F. Müller) Ehrenberg, while Pandorina morum (O. F. Müller) Bory de Saint Vincent, Radiococcus polycoccus (Korshikov) I. Kostikov T. Darienko, A. Lukesová & L. Hoffmann, Ceratium hirundinella (O. F. Müller) Dujardin and Mallomonas acaroides Perty only at station in limnetic zone. The different hydrological regime of the stations and anthropogenic influence are the factors responsible for some of the differences in taxonomic composition and abundance of the phytoplankton. In the vertical distribution of the phytoplankton density the maximums were recorded in euphotic layer and the minimums in the bottom layers. In the horizontal distribution have not been established significant differences. At the station located in the deepest limnetic part of the reservoir dominated mostly lake species, while in transition, shallow river zone, species composition of phytoplankton is more heterogeneous.

Keywords: dominant complexes; euphotic layer; flow zone; limnetic zone; taxonomic similarity

Date published: 2017-12-20