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Assessing small mammal abundance with track-tube indices and mark-recapture population estimates

Journal of Mammalogy

By:
, , and
https://doi.org/10.1644/06-MAMM-A-098R1.1

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Abstract

We compared track-tube sampling with mark–recapture livetrapping and evaluated a track-tube index, defined as the number of track tubes with identifiable small mammal tracks during a 4-night period, as a predictor of small mammal abundance estimates in North Dakota grasslands. Meadow voles (Microtus pennsylvanicus) were the most commonly recorded species by both methods, but were underrepresented in track-tube sampling, whereas 13-lined ground squirrels (Spermophilus tridecemlineatus) and Franklin's ground squirrels (S. franklinii) were overrepresented in track-tube sampling. Estimates of average species richness were lower from track tubes than from livetrapping. Regression models revealed that the track-tube index was at best a moderately good predictor of small mammal population estimates because both the form (linear versus curvilinear) and slope of the relationship varied between years. In addition, 95% prediction intervals indicated low precision when predicting population estimates from new track-tube index observations. Track tubes required less time and expense than mark–recapture and eliminated handling of small mammals. Using track tubes along with mark–recapture in a double sampling for regression framework would have potential value when attempting to estimate abundance of small mammals over large areas.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Assessing small mammal abundance with track-tube indices and mark-recapture population estimates
Series title:
Journal of Mammalogy
DOI:
10.1644/06-MAMM-A-098R1.1
Volume:
88
Issue:
1
Year Published:
2007
Language:
English
Publisher:
Oxford
Contributing office(s):
Northern Prairie Wildlife Research Center
Description:
11 p.
First page:
250
Last page:
260