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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



an animal or plant species distributed in the most diverse ecological conditions, for example, on various soils, in inland waters having distinctive ecological features, or in various terrestrial biotypes. Since they possess an extremely broad ecological valence, ubiquists can exist under almost any climatic conditions, in areas having varied water salinity, and in dissimilar habitats.

An example is the common reed, which lives in water and on dry land, often in places with deep-lying groundwaters that are sometimes strongly saline. The common reed grows on clayey or sandy soils, and its range of distribution is from the tropics to the arctic. The Scotch pine grows in sphagnum marshes, in limestones, in sands, and in clayey soils. The wolf and the common fox are distributed in tundras, forests, steppes, semideserts, and—to a lesser extent—deserts.

Ubiquists are particularly numerous in water, where they include many protozoans, rotifers, Desmidiaceae, and diatoms.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.