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USGS · 70033046

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

A.S. Wiewel·William R. Clark·Marsha A. Sovada
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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.

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A.S. Wiewel, William R. Clark, Marsha A. Sovada. 2007-02-28. Assessing small mammal abundance with track-tube indices and mark-recapture population estimates. https://doi.org/10.1644/06-mamm-a-098r1.1

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