| Annotation |
Milium effusum L. (Poaceae), a perennial forest species with weak phytocoenotic activity is widely
distributed in non-tropical regions of the Northern Hemisphere – in Eurasia and North America, as well
as in North Africa. M. effusum is the only representative in Siberia and East Asia of not large (up to 10
species), unique – polybasic genus Millium L., where most species are Ancient-Mediterranean annuals-
ephemerals with different base numbers of chromosomes (x = 4, 5, 7, 9). Commonly M.effusum (its
tetraploid chromosome number 2n = 28, x = 7 is constant) was not considered as polymorphic. The
study of the ecological range transformation of almost holarctic forest species Milium effusum L. (Poaceae)
in different regions of Eurasia reveals the changes in the size of the ecological range and in the
ratio between the holoecological range and the coenoecological range, as well as the trends in the ecological and biological potential of the species in different parts of its geographical range, depending
on the degree of bioclimatic continentalization. The mutual location of the center of the holoecoareal and
the center of the coenoecoareal Milium effusum in various regions of Eurasia shows what changes in
environmental conditions are favorable for enhancing the cenotic role of the species. The article shows
the tendencies that correspond to the degree of bioclimate continentalization. The Siberian-Middle Asian
tendency is characteristic of the territories with an extremely continental bioclimate, the Caucasian-Eastern
European tendency is typical of the territories with a moderately continental bioclimate, the Far
Eastern tendency is characteristic of the coastal territories with a Pacific monsoon bioclimate. These
transformations of the ecological range confirm the supposed polymorphism of M. effusum.
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| References |
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