ECOLOGICAL AND COENOTIC POSITION OF<i> HORDEUM JUBATUM</i> (<i>POACEAE </i>) IN THE RUSSIAN FAR EAST
The comparative analysis of realized ecological niches of populations of Hordeum jubatum L. ( Poaceae ), native species in the North of the Russian Far East and Alaska (USA), widely distributed as adventive and in many areas as invasive plant species in moderate zone of the North America and Eurasia, demonstrated the signifi cant restriction of ecological niches in the secondary distribution area, in comparison with primary one. Th e diff erence between realized ecological niches in the primary geographic distribution and the secondary one we consider to be a measure of the species ecological and coenotic capacity, and, being applicapable to invasive species, it would be the measure of invasive capacity of the species. It can be measured by grades of ecological scales or percent of their maximal meaning and it can be used for monitoring and forecasting purposes. The invasive capacity of Hordeum jubatum permits to enlarge its geographic distribution firstly in continental part of the Russian Far East and further in the cost.