The sex age kill method of estimating wisconsin s deer population
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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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SAK

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


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  • 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?


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What is the total population?

This square represents the total population of the village…





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100

100

100

50

50



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


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  • INFORMATION FROM THE DNR FOR YOUR deer population in a deer management unit:

  • 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.


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NUMBER OF ADULT BUCKS REGISTERED THE PAST SEASON deer population in a deer management unit:

3) We know that hunters registered 1,000 adult bucks and 1,500 antlerless deer from this unit last fall.

______________________________

1,000


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TOTAL ADULT BUCK POPULATION IN THE AREA BEFORE THE SEASON deer population in a deer management unit:

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


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PORTION OF THE HERD THAT ARE ADULT BUCKS deer population in a deer management unit:

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


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TOTAL DEER HERD POPULATION BEFORE THE HUNTING SEASON deer population in a deer management unit:

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


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NUMBER OF ANTLERLESS DEER REGISTERED THE PAST SEASON deer population in a deer management unit:

3) We know that hunters registered 1,000 adult bucks and 1,500 antlerless deer from this unit last fall.

______________________________

1,500


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TOTAL NUMBER OF DEER REGISTERED THIS PAST SEASON deer population in a deer management unit:

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


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DEER KILLED BUT NOT REGISTERED deer population in a deer management unit:

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


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POST SEASON POPULATION OF THE HERD (WINTER POPULATION) deer population in a deer management unit:

  • Preseason Population

  • Total Deer Registered

  • Killed but Not Registered

  • 8,000

  • 2,500

  • 375

  • 5,125


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NUMBER OF FAWNS BORN IN THE SPRING deer population in a deer management unit:

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


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POPULATION OF THE DEER HERD PRIOR TO NEXT SEASON deer population in a deer management unit:

  • Winter Population

  • + Fawn Crop (new births)

5,125

+ 3,075

8,200


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Population before this PAST Hunting Season… deer population in a deer management unit:

8,000

Population going into NEXT Hunting Season…

8,200

What are your management

recommendations?


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