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Resource Abstract:
- description: A reprint of an article from the Journal of Wildlife Management entitled "Estimating Squirrel Abundance
from Live Trapping Data" by Nixon, Edwards and Eberhardt. The material contained in this reprint may be useful in carrying
out the proposed wildlife management study on the Delmarva Peninsula Fox Squirrel. Estimates of squirrel (Sciuris carolinersis
and S. niger) abundance were derived from several methods of population estimation applied to data obtained by livetrapping
squirrels on the Waterloo Wildlife Experiment Station in southeastern Ohio, l 962 and 1963. The 'frequency of capture
of marked squirrels suggests that the probability of capture is not the same for all squirrels; as a result, a trapped sample
typically contains a disproportionately high number of recaptures. Thus, the multiple census methods of Schnabel and of Schumacher
produced estimates lower than the number of animals considered to comprise the population. Frequency of capture approximated
the geometric distribution. The simplified equation for maximum likelihood estimation (MLE) for the geometric distribution,
presented in 1967 by Edwards and Eberhardt, appeared useful for estimating squirrel abundance from livetrapping data, although
estimates tended to be somewhat high. The intercept of a line fitted to a logarithm plot of data on the frequency of capture,
using linear regression techniques, gave what appeared to be adequate approximations of the numbers of squirrels in the zero
(uncaptured) class. Although estimates derived from M 1 .F. for the geometric distribution and from linear regression are
based on assumption: not strictly fulfilled by the data, these methods should prove useful until better techniques are developed.
MLE for the Poisson distribution appeared to underestimate the zero class. Similarities in results of evaluations of techniques
of population estimation for squirrels and rabbits suggest that further research on population estimation may provide findings
applicable to a variety of species.; abstract: A reprint of an article from the Journal of Wildlife Management entitled "Estimating
Squirrel Abundance from Live Trapping Data" by Nixon, Edwards and Eberhardt. The material contained in this reprint may
be useful in carrying out the proposed wildlife management study on the Delmarva Peninsula Fox Squirrel. Estimates of squirrel
(Sciuris carolinersis and S. niger) abundance were derived from several methods of population estimation applied to data obtained
by livetrapping squirrels on the Waterloo Wildlife Experiment Station in southeastern Ohio, l 962 and 1963. The 'frequency
of capture of marked squirrels suggests that the probability of capture is not the same for all squirrels; as a result, a
trapped sample typically contains a disproportionately high number of recaptures. Thus, the multiple census methods of Schnabel
and of Schumacher produced estimates lower than the number of animals considered to comprise the population. Frequency of
capture approximated the geometric distribution. The simplified equation for maximum likelihood estimation (MLE) for the geometric
distribution, presented in 1967 by Edwards and Eberhardt, appeared useful for estimating squirrel abundance from livetrapping
data, although estimates tended to be somewhat high. The intercept of a line fitted to a logarithm plot of data on the frequency
of capture, using linear regression techniques, gave what appeared to be adequate approximations of the numbers of squirrels
in the zero (uncaptured) class. Although estimates derived from M 1 .F. for the geometric distribution and from linear regression
are based on assumption: not strictly fulfilled by the data, these methods should prove useful until better techniques are
developed. MLE for the Poisson distribution appeared to underestimate the zero class. Similarities in results of evaluations
of techniques of population estimation for squirrels and rabbits suggest that further research on population estimation may
provide findings applicable to a variety of species.
Citation
- Title Estimating Squirrel Abundance From Live trapping Data.
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- creation Date
2018-05-19T07:41:39.421979
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2018-08-06T23:51:45Z
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on a transform by Damian Ulbricht. Run on 2018-08-06T23:51:45Z
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