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

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# THE “SEX – AGE – KILL” METHOD OF ESTIMATING WISCONSIN’S DEER POPULATION - PowerPoint PPT Presentation

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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Presentation Transcript
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. 100 100 100 50 50

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

8. 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.

9. 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

10. 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

11. 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

12. 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

13. 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

14. 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

15. 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

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

17. 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

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

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