Harvest and Survival Rates of Gobblers in NY, OH, and PA
Harvest and Survival Rates of Gobblers in NY, OH, and PA Duane R. Diefenbach U.S. Geological Survey Pennsylvania Cooperative Fish & Wildlife Research Unit Pennsylvania State University Mary Jo Casalena Pennsylvania Game Commission Robert Boyd Pennsylvania Game Commission Mike Reynolds Ohio Division of Wildlife Michael Schiavone New York Dept. of Environmental Conservation Bryan Swift - New York Dept. of Environmental Conservation Objectives For both juveniles and adults
Spring harvest rate (H) Annual survival (S) Reporting rate (r) Landscape factors related to harvest and survival Loss rate of butt-end bands Study Design Band recovery design Reward bands used to ensure 100% reporting by hunters to estimate harvest rate (H) Nonreward bands increase sample size
and allow estimation of reporting rate (r) Study Design Birds trapped in winter and banded as widely distributed as possible across study area 150 reward bands per state per year 150+ nonreward bands/state/yr Birds banded over four years 2006-09 Banding Locations Circles represent 20-mile buffer areas surrounding each capture location 2006 and 2007 2008
Study Design Estimating Band Loss Rates 4 types of butt-end bands Aluminum Aluminum anodized Aluminum enameled Stainless steel Study Design Rivet bands assumed to have no loss Three Years of Banding (1 to go!)
Reward Juv Adult Nonreward Juv Adult Total NY 236 197
339 241 1,013 OH PA 151 180 169 235 182
252 159 230 661 897 Total 567 601 773 630
2,571 Preliminary Harvest and Survival Rates Vary by age, state, and year Harvest Rates Adults 27-53%, avg 38% Juveniles 10-23%, avg 18% Annual Survival Rates Adults 20-35%, avg 28% Juveniles 66-90%, avg 70% Preliminary Reporting Rates Do not vary by year or state Adults 87.2% Juveniles 77.2%
Butt-end Band Loss Manuscript is in press with JWM Based on 887 turkeys recovered 31570 days after banding Stainless (SS) bands better than aluminum (Al) Adults have greater loss rates Overall band loss of both Al and SS unacceptable Butt-end Band Retention Rates Age Type n 3 mo
9 mo 19 mo Ad Al 375 79% 45% 6% Ad
SS 122 92% 71% 16% Juv Al 300
87% 58% 10% Juv SS 90 96% 81% 25%
Status of Project Ohio has withdrawn from study NY and PA trapping winter 2009 for final year of study Data collection concludes July 2009 Final report due Dec 2009
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