Wildlife - Wild Turkeys

2020 Wild Turkey Summer Survey

Wild Turkey Reproduction Continues to be Poor Across the State

Annually since the early 1980's, the S.C. Department of Natural Resources (DNR) has conducted a Summer Turkey Survey to estimate reproduction and recruitment of wild 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. This year approximately 195 participants recorded 1,058 unique observations, seeing approximately 6,300 turkeys across the state in July and August. 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 survived and entered the fall population (Table 1).

Wild turkey productivity is assessed by observations of reproduction and associated survival of offspring being recruited into the population. This measure of young entering the population based on the number of hens in the population is the Total Recruitment Ratio (TRR). This annual index is the most practical measure of productivity because it considers successful hens, unsuccessful hens, and poult survival. Recruitment of four or more poults per hen is considered excellent, three is good, two is fair and considered a break-even point, and one or less poults per hen is poor. If hens are successful at some level, a turkey population can be maintained. However, the goal is to optimize conditions through management applications to promote optimal reproductive success and turkey populations that provide sustainable, quality turkey hunting opportunities into the future. Unlike deer, wild turkeys are much more susceptible to significant fluctuations in reproduction and recruitment. Lack of reproductive success is often associated with bad weather (cold and wet) during nesting and brood rearing season. However, there are a host of predators that take advantage of turkey nests and broods including: raccoons, opossums, skunks, armadillos, snakes, foxes, coyotes, bobcats, feral hogs, and numerous avian predators including hawks, owls, and crows.

South Carolina has experienced declines in turkey productivity since 1988. Average recruitment prior to 1988 was 3.5 poults per hen. Average recruitment since 1988 has been 2.1, representing a 40 percent decrease in average recruitment. Coincidentally, the turkey harvest has decreased over 40 percent since it peaked in 2002. This has been a slow and steady decline with TRR numbers in the 1990’s generally between 2 and 3, but since 2005 numbers below 2.0 have been the norm with an average TRR the last 15 years of 1.7 (Figure 2). This year’s statewide TRR was 1.5. For hens that successfully raise a brood, average brood sizes of 3.5 to 4 poults have remained consistent over time. However, the driving factor in the low productivity is the high percentage of hens that have no poults at all by late summer. Sixty percent of hens observed this summer had no poults and that figure has averaged 57% the last five years (Table 2). Hens without poults are considered unsuccessful and either did not attempt to nest, abandoned their nest, lost their nest to predation or human disturbance, or had no poults survive due to predation, exposure, starvation, disease, or flooding.

These TRR figures consistently below 2.0 are indicative of a shrinking population which does not pair well with increasing hunter numbers and hunter effort. It is also worth noting that turkeys have high reproductive potential and are normally able to maintain populations despite predation and weather-related factors. Predators and periodic poor weather conditions existed prior to the year 2000 so this more recent and prolonged poor success may be tied to a high number of hens that did not breed successfully or poor fitness, vigor and survival of poults due to genetics, disease, other environmental factors or large-scale changes in habitat. Continued research and attention to season timing and other potential contributing factors is needed.

It is also worth noting that both short- and long-term fluctuations up and down are not unexpected given the reproductive strategy of turkeys and the multiple factors that influence their success and survival. This inherent instability is the reason that annual monitoring is critical for this species.

Anyone interested in participating in the annual Summer Turkey Survey is encouraged to sign-up. The survey period is July 1-August 29 annually and those who participate typically spend a reasonable amount of time outdoors during that period. Cooperators obviously must be able to identify wild turkeys and must be comfortable in telling the difference between hens, poults, and gobblers. If you would like to participate in the survey, contact Jay Cantrell at cantrellj@dnr.sc.gov. You will be added to the cooperator list and receive materials at the end of June annually. Those interested in the survey can also download instructions and survey forms at the following website: https://www.dnr.sc.gov/wildlife/turkey/volunbroodsurvey.html.

Figure 1. Map of physiographic regions for 2020 Summer Turkey Survey.

Table 1. Summary of reproductive data for 2020 Summer Turkey Survey by region.

Region	Gobbler Hen Ratio	No. Hens w/Poults	No. Hens w/o Poults (%)	No. Poults	Avg. Brood Size	Total Recruitment Ratio
Piedmont	0.44	266	571 (68)	959	3.6	1.15
Midlands	0.52	100	137 (58)	369	3.7	1.56
Northern Coastal	0.48	149	275 (65)	538	3.6	1.27
Southern Coastal	0.76	292	242 (45)	1,105	3.8	2.07
Statewide	0.54	807	1,225 (60)	2,971	3.7	1.46

 

Table 2. Statewide Summer Turkey Survey reproductive data 2016-2020

Year	Gobbler Hen Ratio	No. Hens w/Poults	No. Hens w/o Poults     (%)	No. Poults	Avg. Brood Size	Total Recruitment Ratio
2016	0.48	893	1,003 (53)	3,370	3.8	1.8
2017	0.58	1,409	1,737 (55)	4,832	3.4	1.5
2018	0.62	1,076	1,206 (53)	3,948	3.7	1.7
2019	0.62	728	1,173 (62)	2,670	3.7	1.4
2020	0.54	807	1,225 (60)	2,971	3.7	1.5
Average	0.57	983	1,269 (57)	3,558	3.7	1.6

 

Figure 2. Summer wild turkey recruitment ratio in South Carolina 1982-2020.

Note the declining trend since 1988. Average recruitment prior to 1988 = 3.5. Average recruitment since 1988 = 2.1. This represents a 40 percent decrease in average recruitment.

The 2020 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.