Title
Comparison of methods to estimate population densities of black-tailed prairie dogs
Author(s)
Severson K.E., Plumb G.E.
Published
1999
Publisher
Wildlife Society Bulletin
Abstract
Recent reintroduction of the black-footed ferret (Mustela nigripes) in west-central South Dakota has focused new attention on black-tailed prairie dogs (Cynomys ludovicianus), because prairie dog colonies provide essential habitat for ferrets. Currently, management agencies are assessing prairie dog populations by counting active burrows, a technique that is attracting criticism. We correlated active and total burrow counts with prairie dog mark-recapture population estimates from 12 colonies located in Badlands National Park and adjacent Buffalo Gap National Grassland. We also correlated visual counts of prairie dogs and counts of mounds from aerial photographs with mark-recapture estimates to assess an alternative method to index populations. We found no significant relationships (P > 0.05) with any form of active burrow or total burrow counts (ground or aerial) using the linear model Y = a + bX. However, visual counts of prairie dogs, using maximum rather than mean values, on 4-ha plots were significantly related (P < 0.0138). The best model was Y = 3.04 + 0.40X, where Y is the maximum visual count and X is the estimated population density. The inverse of this equation X = (Y - 3.04)/(0.40), could be used to index numbers of black-tailed prairie dogs from visual counts under conditions similar to those encountered in this study. An 8-point protocol for making visual counts is provided.
Keywords
burrow; comparative study; estimation method; population density; rodent; United States; Bubalus; Canis familiaris; Cynomys ludovicianus; Mustela; Mustela nigripes; Mustela putorius furo; Rodentia

Access Full Text

A full-text copy of this article may be available. Please email the WCS Library to request.



Back

PUB12852