1. Use of modified snares to estimate bobcat abundance
- Author
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Stricker, Heather K., Belant, Jerrold L., Beyer, Dean E., Kanefsky, Jeanette, Scribner, Kim T., Etter, Dwayne R., and Fierke, Jean
- Abstract
Although genetic and analytical methods for estimating wildlife abundance have improved rapidly over the last decade, effective methods for collecting hair samples from terrestrial carnivores in a mark–recapture framework have lagged. Hair samples are generally collected using methods that permit sampling of multiple individuals during a single sampling period that can cause genotyping errors due to cross‐contamination. We evaluated a modified body snare as a single‐sample method to obtain bobcat hair samples suitable for individual identification using DNA analyses to estimate population size. We used a systematic grid (2.5 × 2.5 km) overlaid on a 278.5 km2study area in Michigan's Upper Peninsula to distribute sampling effort. In each of 44 grid cells, we placed 2–6 snares at established sampling stations and collected hair samples weekly for 8 weeks during January–March 2010. We collected 230 hair samples overall, with 91% of sampling stations obtaining at least 1 hair sample. Fifty‐seven percent of samples had sufficient DNA for species identification, which included bobcat (Lynx rufus, n= 17); raccoon (Procyon lotor, n= 62); coyote, dog, or wolf (Canisspp., n= 29); fox (Vulpes vulpesor Urocyon cinereoargenteus, n= 4); and fisher (Martes pennanti, n= 1). We identified 8 individual bobcats and using Huggins closed capture population models with a one‐half mean maximum distance moved buffer, estimated 10 individuals within the trapping area (95% confidence interval = 8–28) with a density of 3.0 bobcats/100 km2. Our method provides an effective, single‐sample technique for detecting bobcats and estimating abundance. © 2012 The Wildlife Society.
- Published
- 2012
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