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# THE - 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

• 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?

This square represents the total population of the village…

100

100

50

50

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

• 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.

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

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 0.5

2,000

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

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

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

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

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

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

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

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

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

8,000

Population going into NEXT Hunting Season…

8,200