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Concentration Area Definitions
Resident Population
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.
Summer Concentration
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.
Summer Range
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.
Winter Range
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.
Winter Concentrations
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.
Severe Winter Range
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.
Migration Corridor
A specific area through which large numbers of
animals migrate and loss of which would change migration routes.
Production Area
That part of the overall range of elk occupied
by the females from May 15 to June 15 for calving.
Where did the map data come from?
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.
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