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THE “SEX – AGE – KILL” METHOD OF ESTIMATING WISCONSIN’S DEER POPULATION

SAK. THE “SEX – AGE – KILL” METHOD OF ESTIMATING WISCONSIN’S DEER POPULATION. A Simple Example of a Population Reconstruction: Surveys conducted in a small rural village revealed the following information about the village:

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THE “SEX – AGE – KILL” METHOD OF ESTIMATING WISCONSIN’S DEER POPULATION

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  1. SAK THE “SEX – AGE – KILL” METHOD OF ESTIMATING WISCONSIN’S DEER POPULATION

  2. A Simple Example of a Population Reconstruction: • Surveys conducted in a small rural village revealed the following information about the village: • Adult males, 18 years and older, make up ¼ of the village’s population • Half of the adult males have brown eyes • There are 50 adult males with brown eyes in the village • What is the total population of the village?

  3. What is the total population? This square represents the total population of the village…

  4. ¼ of the population is adult males over age 18

  5. ½ of the adult males have brown eyes

  6. There are 50 adult males with brown eyes 50

  7. 100 100 100 50 50

  8. What is the total population? 400

  9. Now, let’s try to estimate the pre-season and post-season deer population in a deer management unit:

  10. INFORMATION FROM THE DNR FOR YOUR • DEER MANAGEMENT UNIT: • Age structure information obtained during deer registration, coupled with fawn/doe information obtained through summer deer observations, indicate that the adult bucks (those 1-½ years and older) make up ¼ of the deer population. • Long term monitoring of this unit tells us that hunters bag & register about ½ of the adult bucks. • We know that hunters registered 1,000 adult bucks and 1,500 antlerless deer from this unit last fall. • We know that another 15% of the total deer killed are not registered and need to be taken into the total. (vehicle collisions, predation, unrecovered kills and poaching) • Long term monitoring indicates that this area can expect a 60% increase over the winter population with a normal fawn crop.

  11. NUMBER OF ADULT BUCKS REGISTERED THE PAST SEASON 3) We know that hunters registered 1,000 adult bucks and 1,500 antlerless deer from this unit last fall. ______________________________ 1,000

  12. TOTAL ADULT BUCK POPULATION IN THE AREA BEFORE THE SEASON 2) Long term monitoring of this unit tells us that hunters bag & register about ½ of the adult bucks. ______________________________ X (0.5)(adult bucks) = 1,000 (0.5)(adult bucks) = 1,000 0.5 0.5 2,000

  13. PORTION OF THE HERD THAT ARE ADULT BUCKS 1) Age structure information obtained during deer registration, coupled with fawn/doe information obtained through summer deer observations, indicate that the adult bucks (those 1-½ years and older) make up ¼ of the deer population. ______________________________ 0.25

  14. TOTAL DEER HERD POPULATION BEFORE THE HUNTING SEASON 1) Age structure information obtained during deer registration, coupled with fawn/doe information obtained through summer deer observations, indicate that the adult bucks (those 1-½ years and older) make up ¼ of the deer population. ______________________________ (0.25)(total pop) = 2,000 (0.25)(total pop) = 2,000 0.25 0.25 X 8,000

  15. NUMBER OF ANTLERLESS DEER REGISTERED THE PAST SEASON 3) We know that hunters registered 1,000 adult bucks and 1,500 antlerless deer from this unit last fall. ______________________________ 1,500

  16. TOTAL NUMBER OF DEER REGISTERED THIS PAST SEASON 3) We know that hunters registered 1,000 adult bucks and 1,500 antlerless deer from this unit last fall. ______________________________ 1,000 bucks + 1,500 antlerless 2,500

  17. DEER KILLED BUT NOT REGISTERED 4) We know that another 15% of the total deer killed are not registered and need to be taken into the total. (vehicle collisions, predation, unrecovered kills and poaching) ______________________________ 2,500 X .15 = 375

  18. POST SEASON POPULATION OF THE HERD (WINTER POPULATION) • Preseason Population • Total Deer Registered • Killed but Not Registered • 8,000 • 2,500 • 375 • 5,125

  19. NUMBER OF FAWNS BORN IN THE SPRING 5) Long term monitoring indicates that this area can expect a 60% increase over the winter population with a normal fawn crop. ______________________________ 5,125 X .60 = 3,075

  20. POPULATION OF THE DEER HERD PRIOR TO NEXT SEASON • Winter Population • + Fawn Crop (new births) 5,125 + 3,075 8,200

  21. Population before this PAST Hunting Season… 8,000 Population going into NEXT Hunting Season… 8,200 What are your management recommendations?

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