Concentration Area Definitions

An area used year-round by a population of elk. Individuals could be found in any part of the area at any time of the

year; the area cannot be subdivided into seasonal ranges. It is most likely included within the overall range of the

larger population. Not all units have a resident population.

Those areas where elk concentrate from mid-June through mid-August. High quality forage, security, and lack of

disturbance are characteristics of these areas to meet the high energy demands of lactation, calf rearing, antler

growth, and general preparation for the rigors of fall and winter.

That part of the range of a species where 90% of the individuals are located between spring green-up and the first

heavy snowfall. Summer range is not necessarily exclusive of winter range; in some areas winter range and summer

range may overlap.

That part of the overall range of a species where 90 percent of the individuals are located during the average five

winters out of ten from the first heavy snowfall to spring green-up.

That part of the winter range of a species where densities are at least 200% greater than the surrounding winter range

density during the same period used to define winter range in the average five winters out of ten.

That part of the range of a species where 90 percent of the individuals are located when the annual snowpack is at its

maximum and/or temperatures are at a minimum in the two worst winters out of ten. The winter of 1983-84 is a good

example of a severe winter.

A specific area through which large numbers of animals migrate and loss of which would change migration routes.

That part of the overall range of elk occupied by the females from May 15 to June 15 for calving.

The Natural Diversity Information Source, NDIS, a Division of the Colorado Division of Natural Resources. NDIS

has an ongoing study with over 12 years of continuous monitoring and tracking wildlife. The concentration maps are

updated on a 5 year cycle.