Comparative Analysis of Population Estimators in a Known Population of White-tailed Deer

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1 Comparative Analysis of Population Estimators in a Known Population of White-tailed Deer JUSTIN FOSTER, RYAN REITZ, Dr. FLOYD WECKERLY, MARK MITCHELL, KEVIN SCHWAUSCH, JASON CARROLL Photo by Jeff Forman

2 Tell em what you re gonna tell em! Blind Counts (AM & PM) IR Camera Driving (Mobile) Helicopter (AM & PM) Spotlight (Traditional & Distance Sampling) Walking (Hahn) These techniques were tested under reasonably controlled conditions over a three year period it didn t go well!

3 Objectives Reliability (Accuracy and Precision) of Deer Census Techniques For Small Acreages ( 500 acres): Abundance Herd Composition Estimates Simulated common landowner practices Techniques Bait Game Fence Scale Temporal Known number of deer

4 Herd Establishment Deer captured in Central Texas Translocated to West Pasture Target: 1 Deer to 6.9 acres Buck to doe ratio of 1:2

5 January March Herd Establishment April - July Acclimation August September Surveys October - December Harvest Timeline

6 Methods Known Population Released Bucks Does Total Final Population Bucks Does Fawns Total

7

8 Methods Survey Design Pre-Bait 1 15 August Bait Acclimation Bait 7 30 September

9 Methods Blind Counts (AM & PM) IR Camera Driving (Mobile) Helicopter (AM & PM) Spotlight (Traditional & Distance Sampling) Walking (Hahn)

10 Accuracy??? Precision??? Accuracy & Precision!!!

11 Pre-Bait Accuracy % Relative Bias Spotlight Distance Mobile Hahn IR Camera and Blind Surveys excluded from results, surveys were ineffective without bait

12 Pre-Bait Precision % CV Spotlight Distance Mobile Hahn IR Camera and Blind Surveys excluded from results, surveys were ineffective without bait

13 Total Population Hahn Pre-Bait

14 Total Population Hahn Baited

15 Total Population Spotlight Pre-Bait

16 Total Population Spotlight Baited

17 Baited Accuracy % Relative Bias Hahn Mobile Distance Spotlight Heli PM Heli AM Blind PM Blind AM IR-Camera

18 Baited Precision % CV Spotlight Distance Mobile Hahn Blind AM Blind PM *IR Camera and Helicopter produced no estimate of variation

19 Herd Composition Hahn Pre-Bait

20 Herd Composition Hahn Baited

21 Baited Accuracy Observed Sex Ratio % Relative Bias Spotlight Mobile Hahn Heli PM Heli AM Blind PM Blind AM IR-Camera Buck:Doe spotlight = Buck:Doe Distance

22 Baited Accuracy Observed Sex Ratio % Relative Bias Spotlight Mobile Blind AM Blind PM Buck:Doe spotlight = Buck:Doe Distance

23 Ancillary Results IR-Camera Branch-antlered deer 98% Identification (n = 54) Detection by day 7

24 Survey Effort in Man Hours Blind 15% n = 41 Heli 1% n = 2 Spotlight 10% n = 27 Distance 9% n = 26 Mobile 4% n = 11 Hahn 2% n = 7 IR-Camera 59% n = 166

25 Conclusions No abundance estimator demonstrated superior accuracy and precision across the 3 years in this study. AM blind surveys were least biased for determining sex ratios. Bait was effective in increasing detectability (Blind, IR- Camera). Cameras were useful in detection of branch-antlered deer (98%). 7 days is sufficient Multiple counts in Blind estimates inflated bias Observer error did not affect reliability on blind surveys

26 Conclusions Hybrid surveys may be more reliable IR Camera and Blind Surveys Further exploration of these and other data required for reliable estimates of abundance in this context Recognize limitations of these estimators Proceed with caution in this context Management decisions should consult all available resources Reliability of techniques at larger scales (e.g. 1,000 acres) should be investigated.

27 Population Estimates averaged over 3 years, baited Mobile Spotlight Blind Hahn Camera

28 Acknowledgements Kelsey Behrens and Jeff Forman Kerr WMA Staff Region 2 Wildlife Division Field Staff (TPWD) Mitch Lockwood (TPWD) Tommy Price and Russell Medina (Southwest Research Institute) James Bonds (Trapper) and staff TPWD Wildlife Division Staff Dr. Randy Simpson and Students of Texas State University

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