Doug Osborne's Presentation on Wildlife
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DOUGLAS C. OSBORNE ASSISTANT PROFESSOR OF WILDLIFE Implications of Arkansas’ No-Jake Harvest Policy 870-460-1448 [ofc.] [email protected]
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Transcript of Doug Osborne's Presentation on Wildlife
DOUGLAS C. OSBORNEASSISTANT PROFESSOR OF WILDLIFE
Implications of Arkansas’No-Jake Harvest Policy
870-460-1448 [ofc.][email protected]
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Assessment of Harvest
Policy
1. Timing of opener2. Season length3. Bag structure
1. Timing on Opener
Timing of Opener can disrupt nesting activity
Thogmartin –initiation of incubation 65% Adult 53% Subadults
2-week egg-laying period hens more sensitive to localized disturbances than during incubation
1. Timing of Opener
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CumulativePercentage
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Breeding Chronology
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1. Timing of Opener
35–40% of adult gobblers can be removed from the population without impacting reproductive output
Whitaker et al. 2005; Diefenbach et al. 2012
2. Season Length
Longer season = more harvest
Season structure that results in harvest of a large proportion of the male population …
…. in conjunction with low reproduction can result in decline in proportion of adult males in population.
2. Season Length
1. Increase Gobbler Carryover 2. Increase Gobbler:Hen to >0.5
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Spring gobbler activityReproductive performance
3. Bag Structure
No-Jake Harvest Policy 1. Increase jakes survival and
recruitment into 2-year old age class
2012 Pilot Study Objectives:
1. Estimate Ŝ of Jakes
2. Estimate Ŝ of Jakes recruited into 2-year old age class
2012 Pilot Study
Ozark Highlands = 30 jakes
Gulf Coastal Plain = 17 jakes
Ŝ: Jakes <14 months
Landscape Composition • Patch size, Surrounding landscape• Hardwood mixed vs. Pine
dominated• Topography
Ozarks Gulf Coastal Plain
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Ŝ: Jakes <14 months
Ŝ Ĥ
AR GCP 0.51 <0.01 AR Ozarks 0.71 <0.01
KY – 0.55 0.20 MO – 0.57 0.11 PA – 0.65 0.25 NJ – 0.80 0.12 OH – 0.87 0.16
Ŝ: 2-Year old Jakes
Harvest Mortality• Public land-use policy
Ozarks Gulf Coastal Plain
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No-Jake Harvest Policy
Ozarks High Harvest Rates – Freelance Low adult gobbler carry-over
High recruitment 2-year old birds
Gulf Coastal Plain Lower Harvest Rate – Permit High adult gobbler carry-over
Low recruitment 2-year old birds
Impacts of No-Jake Harvest Policy
Impacts of No-Jake Harvest Policy
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JakesGobblers
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Where We Go From Here… Phase II
Research Objectives:
1. Jake and Gobbler Ŝ
2. Recruitment of jakes into 2-year old age class
3. Factors influencing Ŝ Cause-specific mortality Hunter density Multiple spatial scales
Jan. 2015 - 2017:
1. Satellite transmitters (n = 60)
Ozark & Ouachita Mnts. 15 jake, 15 gobblers
2. Redeploy lost PTTs annually for 2 years to maintain 60
