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A Talk on the Wild Side.

Spotlight on Spring White-tailed Deer Management

2 men sit in open bed of pickup with harvested deerThe bounty of scientific management made possible by excise taxes. Photo by Iowa DNR

Shining or jacklighting white-tailed deer is a known poaching technique.  A bright spotlight cast on deer in the dark of the night has a slight stupefying effect on the animal.  For that reason, it is also a remarkably effective tool for deer management in Iowa.

logo that says Wildlife and Sport Fish Restoration in circle

The U.S. Fish and Wildlife Service, through its Wildlife and Sport Fish Restoration Program, administers Pittman-Robertson funding and seeks to bolster the 84-year-long relationship between industry and state fish and game agencies through Partner with a Payer.

For 43 years now, the Iowa Department of Natural Resources (DNR) has relied on spotlighting each spring as one means of counting deer. Since 1978, department biologists, game wardens and a multitude of volunteers have counted white-tailed deer along standard, predetermined routes. In 2006, Iowa DNR redesigned the statewide survey to better gather data representing all deer habitat types found in the Hawkeye State. The survey also collects information on observed nocturnal furbearers:  raccoons, opossums, badgers, bobcats, and skunks. This is conservation work funded by excise taxes paid by archery, firearms, and ammunition manufacturers through the Pittman-Robertson Act.

Today, Iowa DNR staff and volunteers count white-tailed deer in all of Iowa’s 99 counties.  Each county has two routes run the same way and the same times every spring. The outcome is a strong data set that allows for year-to-year comparisons that may reveal trends, good or bad.  The survey offers data resolution at a local level, says Iowa DNR Wildlife Biologist Dan Kaminski.

map with green and orange dotsEach Iowa county has two spring white-tailed deer spotlight survey routes. Photo by Iowa DNR  

“The survey is robust and replicable and the data are reliable,” says Kaminski, who helps oversee the deer data collection at his agency’s Boone Research Station.

“The annual spotlight survey reveals statewide white-tailed deer population trends,” says Kaminski. “It’s a most useful tool that yields an index of what goes on at the county level.” 

The spotlight survey is paired with other information Kaminski and his colleagues collect, such as county-by-county deer harvest data and the results of bow hunter surveys.  Iowa archers are asked to keep a diary of their hunts from October to December, recording how many white-tailed deer they see, along with other furbearers observed, and submit the diaries to Iowa DNR researchers.

“We feed all the data into a population model taking into account spring birthing rates and other biological factors,” says Kaminski. “The end results are deer harvest recommendations that ensure proper management over time at a refined, county level.”

Iowa hunters harvest about 100,000 whitetails a year and have done so for the last decade. The state has a 30 percent harvest rate on all deer hunting licenses sold.

Excise taxes from the Pittman-Robertson Act make it possible.

“Pittman-Robertson funding is critical,” says Kaminski. “It pays our wildlife research, statisticians, and management salaries—and allows us to complete extensive whitetail surveys each year.”

What is good in Iowa may be good elsewhere.  Kaminski and his colleagues recently published findings on their research into the efficacy of spotlighting, having collected location data on 71,323 whitetails in more than 20,000 groups of deer over a five-year period. They shared what they know with other wildlife professionals via a paper published in the peer-reviewed Journal of Wildlife Management


Craig Springer, Wildlife and Sport Fish Restoration

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