Nikulina T.V., Medvedeva L.A.
В издании Diatoms: Fundamentals and Applications. Vol.1.
Год: 2019 Страницы: 355-389
The diatom flora of 14 hot springs belonging to four geothermal fields (Malkinsky, Nachikinsky, Paratunsky, and Mutnovsky) in the south-eastern Kamchatka, were surveyed in summer-autumn period of 2012, 2013, and 2015. The diatom flora is represented by 170 species (177 intraspecies taxa) from the Classes Coscinodiscophyceae, Fragilariophyceae, and Bacillariophyceae. Most common were 25 species found in periphyton communities and in floating algobacterial mats. The main dominants in the thermas were diatoms Pinnularia acidojaponica, Achnanthidium exiguum, Caloneis bacillum, Nitzschia amphibia, Rhopalodia acuminata, and Gomphonema parvulum. The algal communities of thermal springs are mainly composed of algae of cold waters that have adapted to high temperatures. As a rule, in acidic water with the chemical type: SO4-HCO3-Na-Ca and at temperature higher than 55 °C, species composition of diatom communities is significantly reduced. In the diatom flora, those that are benthic, indifferent to salinity, alkaliphilic, oligo- and beta-mesosaprobic, and widely distributed species are dominant.
