Udvardy originally further divided the biogeographic realms into 203 biogeographical provinces.
Intensive regional analyses of biodiversity patterns across five continents and biogeographical realms have been used by the World Wildlife Fund to defined the boundaries of terrestrial ecoregions for the Global 200.
The Montane Cordillera Ecozone extends from the eastern Rocky Mountains in Alberta to the western slope of the Cascades in British Columbia, and from the latitude of the Skeena Mountains in northern British Columbia to the United States border.
Invasion of the Ecozone by plants and animals from peripheral refugia was episodal and correlated with climatic fluctuations throughout the Holocene.
This is a subalpine zone occurring in the severe climate in the north of the Ecozone.
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