Silica scaled Protista and Stomatocysts in East Siberia

Abstract

Abstract. The review examines the work on biodiversity in the reservoirs of Eastern Siberia of a wide, but poorly studied group of organisms forming siliceous scales and bristles these are scaled chrysophytes, chrysophycean stomatocysts and heterotrophic protists: rotosphaerids, colorless free-living thaumatomonad flagellates, centrohelid heliozoans. The difficulty in studying these objects is the need to use electron microscopy for their species identification. High biodiversity of silica scaled Protozoa has been revealed in the reservoirs of Eastern Siberia and the relationship of their species composition with the parameters of the aquatic environment, including in areas of local anthropogenic impact, has been shown. The recorded enrichment of the mouths of Arctic rivers with boreal species is important for predicting changes in aquatic ecosystems in the context of GCC. The proposed scenario of the settlement of siliceous chrysophytes at the beginning of the Holocene may be valid for other small planktonic organisms. The high degree of preservation of siliceous stomatocysts in sediments allows them to be used as an additional signal of changes in lake ecosystems in the past, this is based in particular on the reconstruction of the ecosystem and changes in the level of Lake Vorota (Yakutia) in the Holocene-Upper Pleistocene.

Diversity of Silica-Scaled Chrysophytes in the Steppe Zone of the Southern Urals with a Description of a New Species from the Genus Mallomonas

“…Mallomonas annulata (Figure 2D,E) is a widespread species recorded in North and South America, Great Britain, Europe, Asia, and Australia [4]. In the territory of Russia, the species was recorded in the water bodies of St. Petersburg and Leningradskaya Oblast [11,15,27], Yamalo-Neneczkii Autonomous Okrug [19], and the Republic of Sakha (Yakutia) [34].…”

“…Mallomonas eoa (Figure 2N,O) is a widespread species known in North and South America, Great Britain, Europe, Asia, and Australia [4]. In the territory of Russia, M. eoa was previously found in the water bodies of the Republic of Karelia [11], St. Petersburg and Leningradskaya Oblast [15], Yaroslavskaya Oblast, Nizhegorodskaya Oblast [12,13], the Republics of Buryatia [32] and Sakha (Yakutia) [18,34], Bolshezemelskaya tundra [20], Yamalo-Neneczkii Autonomous Okrug [19], and reservoirs of the Volga basin [13].…”

“…Discoveries of M. lelymene in Russia have not been numerous. Previously, the species was identified in small water bodies in the Neneczkii Autonomous Okrug, Arkhangelskaya Oblast [20], Vladimirskaya Oblast [21], and the Republic of Sakha (Yakutia) [34].…”

“…Mallomonas pillula f. valdiviana (Figure 4N) has been recorded in North and South America, Europe, and Asia [4,47]. In Russia, M. pillula f. valdiviana was found in the Republics of Komi [20,36] and Sakha (Yakutia) [34].…”

“…Until now, most of the work has been carried out in the central and northern regions of European Russia [20][21][22][23][24][25][26][27][28][29]49]. A number of interesting works have been published on the study of rivers, reservoirs, lakes, and swamps in Eastern Siberia, most of which have been carried out in the last decade [30][31][32][33][34]40]. The Ural region and Western Siberia have been studied to a much lesser extent [19,27,[35][36][37]39].…”