Circumpolar Arctic Floristic Provinces - West Siberian Group

 

West Siberia - East Siberia - Beringia - Canada - North Atlantic

Circumpolar Arctic Floristic Provinces - West Siberian Group

Circumpolar Arctic Floristic Provinces - West Siberian Group.
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Yurtsev (1994) states that this group " …covers the whole West Eurasian sector of the true Arctic (from 67° to 82° N); it is subdivided into [three] subprovinces, each corresponding to a major geomorphological unit. They form a natural swarm, its 'nucleus' being the mountain axis Ural-Pay Khoy-Novaya Zemlya, which runs through several vegetation zones from steppe into polar desert."

"The obvious negative features of the province are: the absence of (1) East Siberian, East Siberian-North American and North American species: (2) North Atlantic Hypoarctic and boreal species (and Arctic-alpine species such as Alchemilla alpina); (3) boreal and even boreal-nemoral taxa, e.g. Calluna vulgaris and Nardus stricta. There are few endemic and other differential taxa in the province or its subprovinces, i.a. Gastrolychnis angustiflora s.s., Papaver lapponicum ssp. Jugoricum, Pedicularis dasyantha, P. sudetica ssp. arcto-europea. The longitudinal floristic gradient is complicated by an 'inversion' in the Ural-Novaya Zemlya subprovince where the East Siberian species (and partly, the amphi-Atlantic) are better represented than in the adjacent lowland areas (Igoshina 1966). The presence of species of the genera Alchemilla, Euphrasia, Gnaphalium, Hieracium etc. is a distinctive feature of the Atlantic sector. The flora of this province was subjected to the destructive action of Quaternary marine transgressions and glaciations (Tolmachev 1970) as well as to the expansion of forest and shrub vegetation. Most favorable for the dispersal of Siberian and East Siberian continental elements was the cold and dry period of the Late Pleistocene, synchronous with the great sea regression." (From Yurtsev 1994.)