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Frequency Distributions of Deer and Elk Pellet Groups
Burt R. McConnell and Justin G. Smith
The Journal of Wildlife Management
Vol. 34, No. 1 (Jan., 1970), pp. 29-36
Stable URL: http://www.jstor.org/stable/3799488
Page Count: 8
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Frequency distributions of deer (Odocoileus hemionus) and elk (Cervus canadensis) pellet groups were determined on seven uniform areas in Washington and Oregon ranging from 2-230 acres. Distributions of groups on six areas agreed with the Poisson series and were considered random. The lack of randomness on the remaining area was believed to result from the manner of cattle grazing and the peripheral influence of an adjacent timbered hillside and ravine used by deer for watering, resting, and escape. The distribution of groups on this area provided equally good fits to the Neyman Type A, Thomas Double Poisson, and negative binomial models, but the latter was preferred for practical reasons. Distributions of deer and elk pellet groups on the 10,000-acre Starkey Experimental Forest and Range in Oregon were also studied. They departed widely from the Poisson model but were in close agreement with the negative binomial model. Elk pellet groups were less aggregated than deer groups, and the pattern of distribution of both appeared to be influenced more by environmental than social factors.
The Journal of Wildlife Management © 1970 Wiley