Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 7-Day Trial for You or Your Team.

Learn More →

Evaluation of Two Density Estimators of Small Mammal Population Size

Evaluation of Two Density Estimators of Small Mammal Population Size Abstract We evaluated naive density estimates and density estimates corrected for “edge effect” using mean maximum distance moved (MMDM) for small mammal populations by Monte Carlo methods. Two densities, 25 and 100/ha, were generated in random or slightly clumped spatial patterns within a 4-ha area and populations had average capture probabilities of either 0.16 or 0.24 allowing variation in time, behavior, and heterogeneity. Animals were assumed to have a bivariate normal utilization distribution of either 0.25, 0.5, or 0.75 ha. An 18 by 18 trapping grid with 7 m trap spacing was simulated with trapping over 6 or 8 occasions. Evaluation of 1,393 repetitions divided among 8 different cases revealed a large positive bias (69–89%) for the naive density estimates, and density estimates by using the MMDM had less than 22% bias. A robustness to home range size was demonstrated by the MMDM. Difficulties with both methods are indicated. This content is only available as a PDF. © 1985 The American Society of Mammalogists http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Mammalogy Oxford University Press

Evaluation of Two Density Estimators of Small Mammal Population Size

Download PDF
9 pages

Loading next page...
 
/lp/oxford-university-press/evaluation-of-two-density-estimators-of-small-mammal-population-size-7TTSmWEwNh

References (0)

References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.

Publisher
Oxford University Press
Copyright
© 1985 The American Society of Mammalogists
ISSN
0022-2372
eISSN
1545-1542
DOI
10.2307/1380951
Publisher site
See Article on Publisher Site

Abstract

Abstract We evaluated naive density estimates and density estimates corrected for “edge effect” using mean maximum distance moved (MMDM) for small mammal populations by Monte Carlo methods. Two densities, 25 and 100/ha, were generated in random or slightly clumped spatial patterns within a 4-ha area and populations had average capture probabilities of either 0.16 or 0.24 allowing variation in time, behavior, and heterogeneity. Animals were assumed to have a bivariate normal utilization distribution of either 0.25, 0.5, or 0.75 ha. An 18 by 18 trapping grid with 7 m trap spacing was simulated with trapping over 6 or 8 occasions. Evaluation of 1,393 repetitions divided among 8 different cases revealed a large positive bias (69–89%) for the naive density estimates, and density estimates by using the MMDM had less than 22% bias. A robustness to home range size was demonstrated by the MMDM. Difficulties with both methods are indicated. This content is only available as a PDF. © 1985 The American Society of Mammalogists

Journal

Journal of Mammalogy – Oxford University Press

Published: Feb 26, 1985

There are no references for this article.