Affiliation:
1. Kola Science Centre RAS, Apatity, Russia
2. Kola Science Centre RAS, Apatity, Russia; Institute of Geology of the Karelian Research Centre RAS, Apatity, Russia
Abstract
For the first time, the composition of diatom complexes of the bottom sediments of Lake Semenovskoe was studied, located within the city of Murmansk. In the core 44 cm thick, 117 species and intraspecific taxa of diatoms were found. Significant rearrangements in the taxonomic composition and structure in the direction from the lower layers to the upper ones were revealed. In the lower layers of the core are benthic acidophilic forms of Frustulia rhomboides (Ehrb.) De Toni (32%), Brachysira serians (Bréb.) Round & Mann (8,5%), Semiorbis hemicyclus (Ehrb.) Patrick (6,1%). In modern layers, the dominant steel species are: planktonic alkalibiont Aulacoseira subarctica (Müll.) Haworth (46%), planktonic-benthic alkaliphile Cyclotella meneghiniana Kütz. (10%). The benthic acidophilic species S. hemicyclus and Oxyneis binalis (Ehrb.) Round completely disappeared.