WILD BILL

The Elk Problem


By Bill Schneider, 10-27-05

 
 

While writing several articles about the contentious bison hunt, one little fact has been sticking in my throat like one of those Y-shaped bones you find in pike fillets. (And those “little facts� are like “little problems;� they’re rarely little.)

We all know lots of people are major league excited about a few dozen bison leaving Yellowstone Park and instantly turning into truckloads of buffalo burger on network news, but this concern looks way overdone compared to our little elk problem.

Meanwhile, thousands of elk freely move around the Greater Yellowstone area, and some of them carry brucellosis, the same dreaded livestock disease that has caused decades of political gridlock over bison management. We have been brought to our knees trying to keep bison away from cattle in two relatively small areas on the boundary of Yellowstone Park. Imagine the controversy trying to keep elk away from cattle throughout the Greater Yellowstone area!

So why isn’t everybody suffering from high blood pressure over our “little� elk problem? Why aren’t agencies worried about elk transferring brucellosis to cattle? Or Montana losing its coveted brucellosis-free status? Or what we’d have to do to fix the elk problem?

To get these answers, I had a long chat with Keith Aune, chief of wildlife research for the Montana Department of Fish, Wildlife and Parks. Aune has studied the brucellosis situation for years and is now deeply immersed in the bison controversy.

For starters, Aune says, clearly with some frustration, “We have more heartache over elk than bison. We have a lot of energy going into reducing the risk of elk spreading brucellosis. People think we’re only concerned about bison, but go to our website and you’ll see. We’re more concerned about elk spreading brucellosis than bison.�

Second, and most surprising to me, Aune points out that “The only documented cases of brucellosis being transferred from wildlife to cattle is from elk, not bison. There has never been a fully documented case of bison affecting cattle.�

So why do we outdoor writers keep writing about the threat from bison instead of from elk? That’s a question Keith Aune would like me answer, and I’m a little embarrassed to say it out here on the Internet, but I’ll confess. We writers tend to follow controversy instead science.

This brucellosis situation can get complicated in a hurry, but briefly, it’s all about the prevalence of the disease—i.e. the percentage of the animals carrying brucellosis. Yellowstone bison have a prevalence of up to 40 percent, but Montana elk around the park have what’s called “ zero prevalence�—with one exemption. (“Zero,� incidentally, really means “almost zero� because the disease has to be fairly prevalent to, in Aune’s words, “maintain itself.� This means if only a small percentage of the animals, such as the 1-3 percent we see in Montana, have brucellosis, it somehow becomes self-limiting or even magically disappears from the population.)

The exception is a “hot spot� on a private ranch in the Upper Madison River drainage without much hunting pressure to keep elk numbers down. Right now, the prevalence on that ranch is 6.9 percent. When it reaches 7 percent, alarms go off, and something has to be done, such as reducing the size of the affected elk herd. What happens if this hot spot spreads to other areas of the state? “That would be a really big problem,� Aune admits.

“This is all about risk management,� he explains. With the exception that one hot spot, he considers elk in Montana “a low-risk situation.�

The USDA gives a state “one free lunch,� which means one documented case of brucellosis. Assuming the affected cattle herd is immediately cleaned up and the disease contained, the state won’t lose its brucellosis-free status but is put “on notice.� A second incident means a state loses its brucellosis-free status.

Earlier this year, the USDA put Idaho on notice because of a documented case of elk transferring brucellosis to cattle when a rancher fed elk from the same facilities used to feed cattle. One more case and Idaho loses its brucellosis-free status, a disaster for the livestock industry because it severely limits or prevents stockgrowers from shipping live cattle out of the state.

To put it bluntly, Wyoming is the problem. The Cowboy State has had multiple cases of elk transferring brucellosis to cattle and lost its brucellosis-free status in 2003. Wyoming, in essence, poses a huge threat to Idaho, Montana and other neighboring states.

Wyoming creates unnatural concentrations of elk by feeding them during winter months. In addition to the famous feedgrounds on the National Elk Refuge near Jackson, the state not only condones but actually operates twenty-two additional elk feedgrounds. Elk herds using these feedgrounds have a brucellosis prevalence of up to 50 percent. And of course, there is nothing to prevent these affected animals from traveling over state boundaries.

Aune laments the fact that most people think “Yellowstone Park is the problem,� but it’s actually the Wyoming feedgrounds creating an epicenter for the spread of the disease. A high concentration of animals produces ideal conditions for spreading brucellosis and other diseases, including the granddaddy wildlife disease of them all, Chronic Wasting Disease. (More on that in an upcoming column.)

“The risk of elk spreading brucellosis is not as great in Montana because we don’t have feedgrounds,� Aune explains. “The farther you get from the feedgrounds, the less prevalence of brucellosis you have. The disease needs high density of animals to maintain itself. Otherwise it disappears.�

Aune also explains that elk habitat and behavior differs from cattle more than bison. “But the real difference between bison and elk is risk,� he explains. “Bison are more likely to have brucellosis and are more likely to transfer it to cattle.�

That’s one reason Montana puts emphasis on bison. “We can’t put too many resources into a low-risk situation.� After my chat with Keith Aune, I have to thank Montana and Idaho for trying to keep elk populations high by protecting critical winter ranges instead of feeding hay to elk during winter months to maintain artificially high populations.

Fortunately, in Montana, brucellosis has not been found in elk outside of the Greater Yellowstone area. Even if it were detected, it would probably be zero prevalence. Nonetheless, the brucellosis situation waits on the horizon like a nasty-looking storm cloud. The Upper Madison hot spot could spread to other areas. Not a good thing! Also, what happens if cattle on that Upper Madison ranch are diagnosed with brucellosis? If that happens, it will probably be assumed that the transfer came from elk, so what do we do? Kill all the elk in the local area? Nobody would consider this a little problem.



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