Wildlife - Wild Turkeys

2008 Summer Turkey Brood Survey

Wild Turkey Reproduction Increases Slightly This Summer

Based on a S.C. Department of Natural Resources survey, reproduction by wild turkeys increased only slightly over 2007 which was the poorest year on record, according to a state wildlife biologist.

Annually since the early 1980’s, the S.C. Department of Natural Resources (DNR) conducts a Summer Turkey Brood Survey to estimate reproduction and recruitment of turkeys in South Carolina. The survey involves agency wildlife biologists, technicians and conservation officers, as well as many volunteers from other natural resource agencies and the general public.

After poor reproduction the last three years, it appears that wild turkey reproduction increased in 2008, but this increase was only slight, according to Charles Ruth, DNR Deer and Turkey Project supervisor. Although wild turkeys nest primarily in April and May in South Carolina, the survey does not take place until late summer. Therefore, the survey statistics document poults (young turkeys) that actually survived and entered the population going into the fall. Although average brood size was good with hens averaging 4.2 poults, 49 percent of hens observed had no poults at all by late summer leading to a total recruitment ratio of 2.1. Recruitment ratio is a measure of young entering the population based on the number of hens in the population. Both of these statistics were lower than biologists would like to see and represent what could be considered a “break even” situation.

“In the Southeast,” Ruth said, “Mother Nature often plays a big role in turkey populations with heavy rainfall coupled with cool temperatures during the spring nesting and brood rearing season leading to poor reproductive success.” However, that does not appear to be the case in 2008 because those types of events were not widespread across the state. Clearly there may have been broods lost due to strong thunderstorms at the local level, however, this does not explain what can be considered only fair reproduction at the statewide level.

“At the regional level it appears that reproduction was poorest in the piedmont and mountains and increased slightly moving towards the lower coastal plain. Perhaps this is related to the pattern of drought that the state is currently experiencing. Although dry conditions are typically good for turkey reproduction, there is likely a limit to what constitutes dry in terms of being beneficial to turkeys. Under the conditions that much of the state experienced this summer, the production of food in the form of seeds and insects could have been limited, as could the vegetative growth that is important brood rearing cover,”

Finally, “Perhaps we have reached a point in time where the relationship between the turkey population and habitat is simply not as good as it was when turkeys were expanding across the state”, said Ruth. We have seen a decline in the deer population in most areas in the last 6-8 years and this is likely linked to the amount of habitat in pine plantations that are greater than 10 years old. This type of habitat simply does not have high productivity and it may be playing a role in turkey reproduction.

What does fair reproduction in 2008 mean for the spring turkey hunter? Ruth indicated, “Although reproduction was a little better this year, following the previous three years of poor reproduction the number of mature gobblers (2 years and older) available during the spring of 2009 will be about the same if not lower across most of the state. The number of jakes (immature gobblers) should also be somewhat lower than hunters like to see. This is significant because jakes can make up 25 percent of the spring harvest following years of good reproduction.”

On a positive note, the gobbler to hen ratio remains good with a statewide average of 0.71 gobblers to each hen. The only exception was in the piedmont were the gobbler to hen ratio was only 0.37. Many experts believe that when gobbler to hen ratios get below 0.5, the quality of hunting can be impacted because hens are extremely available which affects gobbling and responsiveness to calling by hunters.

“The bottom line,” Ruth said, “is that it will likely take a couple of years of better reproduction to overcome less than desirable reproduction the last four years.” That is the nice thing about turkeys though; given the right conditions they can naturally bounce back in a short period of time.

Hunters often wonder why DNR does not promote or schedule a fall turkey season, and although there are a number of considerations, poor reproduction like that experienced the past four springs is a very important factor.

“Bear in mind that hunting turkeys in the fall differs drastically from spring gobbler hunting, which is familiar to most hunters,” Ruth said. “Not only do hunting and calling techniques differ, fall seasons typically allow hunters to take hens or gobblers. Although DNR monitors turkey reproduction annually, the information is not available until about the same time a fall turkey season would be underway, so it is too late to schedule a fall season based on reproductive success or sound biology. DNR could simply schedule a fall season without regard to reproductive data, but harvesting hens following a summer with poor reproduction would further depress the number of hens potentially leading to a rapid decline in turkeys.”

“Anyone interested in participating in the annual Summer Turkey Brood Survey is encouraged to sign-up”, said Ruth. The survey period is July 1-August 29 annually and folks who participate typically spend a reasonable amount of time outdoors during that time period. Cooperators obviously must be able to identify wild turkeys and must be comfortable in telling the difference between hens, poults, and gobblers. Cooperators are provided with survey forms prior to the survey and a reporting notice and postage paid envelope at the end of the survey period. If you would like to participate in the survey, send your name and address to Turkey Brood Survey, P.O. Box 167, Columbia, SC 29202. You will be added to the cooperator list and receive materials at the end of June annually.

Figure 1. Map of physiographic regions for 2008 Summer Turkey Survey.

Map of physiographic regions for 2005 Summer Turkey Survey.

Table 1. Summary of reproductive data for 2008 Summer Turkey Survey by region.

Region Gobbler
Hen
Ratio
No. Hens
w/Poults
No. Hens w/o
Poults (%)
No.
Poults
Average
Brood
Size
Total
Recruitment
Ratio
Piedmont
0.37
528
506 (49)
2,164
4.1
1.1
Midlands
0.63
94
250 (73)
381
4.1
2.1
Northern Coastal
0.89
328
288 (47)
1,306
4.0
2.1
Southern Coastal
0.99
554
402 (42)
2,485
4.5
2.6
Statewide
0.71
1,504
1,446 (49)
6,336
4.2
2.1

Table 2. Statewide Summer Turkey Survey reproductive data 2003-2008.

Year Gobbler
Hen
Ratio
No. Hens
w/Poults
No. Hens w/o
Poults (%)
No.
Poults
Average
Brood
Size
Total
Recruitment
Ratio
2003
0.63
933
994 (52)
3,253
3.3
1.7
2004
0.62
1,159
447 (28)
4,854
4.1
3.0
2005
0.77
936
989 (51)
3,066
3.3
1.6
2006
0.61
1,078
1,078 (50)
3,659
3.4
1.7
2007
0.77
904
1,269 (58)
3,240
3.6
1.5
2008
0.71
1,504
1,446 (49)
6,336
4.2
2.1
Average
0.68
1,085
1,037 (49)
4,068
3.7
1.9

2008 Summer Turkey Survey Results

County No. Observ. No. Poults No. Hens w/ Poults No. Hens w/o Poults No. Hens % Hens w/o Poults No. Gobblers No. Unid. Total Turkeys Observed
Abbeville
38
126
33
19
52
37
21
21
220
Aiken
119
110
32
92
124
74
100
73
407
Allendale
18
123
22
4
26
15
27
29
205
Anderson
19
67
17
16
33
48
21
14
135
Bamberg
25
135
24
9
33
27
73
5
246
Barnwell
156
178
61
139
200
70
211
10
599
Beaufort
15
113
22
5
27
19
34
12
186
Berkeley
225
1197
261
105
366
29
417
36
2016
Calhoun
2
0
0
2
2
100
0
0
2
Charleston
66
259
60
40
100
40
56
10
425
Cherokee
44
62
11
14
25
56
2
3
92
Chester
33
207
52
41
93
44
16
0
316
Chesterfield
47
54
10
34
44
77
23
38
159
Clarendon
13
82
13
4
17
24
14
0
113
Colleton
51
250
64
43
107
40
72
5
434
Darlington
13
29
7
8
15
53
21
4
69
Dillon
15
26
7
7
14
50
18
11
69
Dorchester
3
12
1
6
7
86
7
10
36
Edgefield
23
69
21
17
38
45
7
4
118
Fairfield
41
167
41
52
93
56
18
24
302
Florence
34
108
25
18
43
42
38
45
234
Georgetown
187
605
158
147
305
48
314
125
1349
Greenville
9
29
5
20
25
80
17
4
75
Greenwood
38
83
26
28
54
52
23
2
162
Hampton
10
22
4
3
7
43
4
20
53
Horry
24
61
27
44
71
62
40
4
176
Jasper
6
83
11
3
14
21
11
0
108
Kershaw
15
11
5
48
53
91
23
16
103
Lancaster
11
48
7
4
11
36
6
2
67
Laurens
21
67
11
11
22
50
12
30
131
Lee
11
13
9
28
37
76
15
0
65
Lexington
2
3
1
1
2
50
0
0
5
McCormick
93
187
56
61
117
52
66
63
433
Marion
46
240
58
29
87
33
60
0
387
Marlboro
9
19
4
18
22
82
4
0
45
Newberry
51
190
36
37
73
51
37
9
309
Oconee
18
53
13
34
47
72
17
7
124
Orangeburg
35
113
24
45
69
65
31
20
233
Pickens
14
51
16
17
33
52
6
6
96
Richland
19
91
16
8
24
33
14
2
131
Saluda
20
45
15
5
20
25
9
0
74
Spartanburg
20
59
14
11
25
44
10
9
103
Sumter
15
51
10
11
21
52
15
47
134
Union
144
579
137
106
243
44
86
50
958
Williamsburg
49
184
40
39
79
49
65
46
374
York
15
75
17
13
30
43
8
6
119
State Total
1,882
6,336
1504
1,446
2,950
49
2089
822
12,197

The 2008 Summer Turkey Brood Survey above is provided in Adobe® Acrobat® (PDF) format. Adobe® Reader® is required to open this file and is available as a free download from the Adobe® Web site.
Get Adobe Reader