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Home CCSU Theses & Dissertations Black Bear Mark-Recapture Study Using Remote Cameras

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Identifier	Thesis 1763
Author	Knorr, Linda
Title	Black Bear Mark-Recapture Study Using Remote Cameras
Publisher	Central Connecticut State University
Date	2004
Resource Type	Master's Thesis
Notes	The number of encounters between black bears (Ursus americanus) and people is increasing in Connecticut. This increase necessitates management planning, which cannot occur until the actual population size of black bears has been determined. A mark-recapture study may be useful; however, current research suggests that bears may become either trap happy or trap shy, which can skew population estimates. One approach to produce a more efficient population estimate is to use different modes of capture for the first and second sampling. For this study I used Moultrie Feeders Game Cam II cameras as the mode of "recapture" of bears that had been trapped for the first sampling. I collected 124 black bear photographs; ninety-six percent (119/124) were usable photos (bears could be identified as either tagged or not tagged). These numbers were inserted into the Peterson estimate to determine an estimate of the total population of black bears in my study area. In order to determine whether multiple sampling of some individuals but not others biased the results, I compared three methods of estimating population size that differ in the number of multiple samples. These methods were compared to the estimate produced by DEP trapping efforts for the summer of 2003. After comparing the state trapping data with the number of photographs of marked and unmarked bears caught in the second capture using the cameras as the mode of recapture, it appeared that the bears were ‘trap happy' but not ‘camera happy'. My camera based method of "recapture" resulted in a higher calculated population estimate than was produced using trap-re-trap data only. Based on my findings, I believe the most accurate population estimate of black bears in the study area is 83 bears. The cameras were a viable, and possibly preferable, alternative to the traditional mark-recapture study, because the ability to move the cameras quickly and easily to a new station after a bear visit allowed me to sample a large number of locations at minimal cost and time, while reducing the bias associated with ‘trap-happy' bears.
Subject	Black bear -- Connecticut
Department	Department of Biological Sciences
Advisor	Halkin, Sylvia L. (Sylvia Lisa)
Type	Text
Digital Format	application/pdf
Language	eng
OCLC number	713733958
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