Prairie Dogs, Pasqueflowers and Prescribed Fire

I drove up to the Niobrara Valley Preserve last Thursday afternoon. I needed to be there to help with a prescribed fire on Friday, but I scheduled my trip so I’d have a little alone time to wander Thursday evening. My schedule has been pretty full lately and I needed some quiet time to explore.

On my last trip to NVP, I’d tried to photograph some pasqueflowers, but they were all either covered with snow or wilted from cold and frost. This time, as soon as I arrived, I headed that direction again to see if I’d have better luck. On the way, though, I saw the little prairie dog town nearby and decided to start there.

A prairie dog eating dandelion leaves.

The photo above was my favorite from the prairie dog town. Between my arrival at the prairie dog town and the moment I took that photo, I had about an hour’s worth of slow army crawling and lying on my belly, trying to look innocuous. I’m still finding sandbur spines in my legs and elbows and my neck. That’s not a complaint, mind you, just context.

When I first got to the prairie dog town, I used my typical strategy of looking around for any prairie dogs that didn’t immediately dive for cover upon seeing me. A grand total of one prairie dog fit that criterion, so I pulled my hood over my head to hide my shape a little and started a very slow belly crawl in its direction. Every time it twitched toward its hole, I’d stop until it relaxed. Then I’d continue to slither across the ground, trying to ignore the tiny stabs from sandburs and the occasional cactus (Opuntia fragilis – if you know, you know).

This is not the look of a prairie dog that was comfortable with my presence.
Still on alert.

I eventually got into range and tried to stay as motionless as I could, hoping the prairie dog would get used to me and go back to its normal routine. It took a while, and it came in stages. For the first 15 minutes or so, the prairie dog mostly stared at me from various upright poses, periodically taking a few steps away from its hole and then quickly returning. Eventually, it got comfortable enough to move a few feet from the burrow entrance and do a little foraging. Even then, it frequently stopped and stared at me.

In this photo, the prairie dog had moved away from its hole a little and was starting to look for food, but it was still very wary and paused frequently to look at me.

Finally, after about 30 minutes or so, the prairie dog seemed to settle in. It kept one eye on me most of the time, but also started moving around quite a bit. Interestingly, it kept digging in the ground and then eating something it found there. I’m pretty sure it was either a root or rhizome, but I couldn’t tell which. I was hoping I’d get a photo that I could enlarge enough to identify it, but the photo below was the best I got and it wasn’t very revealing. I’d never seen a prairie dog dig for its dinner before, but it certainly makes sense at this time of year when there’s not much for available green vegetation.

Feeding on a root or rhizome it had just dug up.

Toward the end of my time, I remembered to do a little video work. A clip of the prairie dog chewing on a dandelion leaf is embedded below. As always, if the video doesn’t work, click on the title of this post to open it online. Then you’ll see the video and also be able to click on individual photos to see better versions of them.

Prairie dog feeding on a dandelion. I left the sound on to give you a feeling of how windy it was (very) but don’t feel obligated to listen to it.

I also managed to get a few photos of the prairie dog making funny faces. Here’s one of them. I feel a little bad posting it because it seems unfair. After all, we all make funny faces, but usually don’t get caught by someone with a camera. Don’t tell the prairie dog, ok? We’ll just hope it’s not a follower of this blog.

Sneezing? Laughing? Hard to say, but you can see all the soil particles from chewing on plant roots (rhizomes?)

After a while, I noticed the sun was getting lower and I figured I’d better go check the pasqueflowers while there was still decent light for photography. I knew the stiff breeze would be whipping them around a little, even as short as they are, so I needed a little extra light for fast shutter speeds. When I got to my favorite patch, most of the pasqueflowers had finished blooming for the season but a few were still going – though they appeared to be closing up for the night.

Pasqueflower (Pulsatilla patens) blooming on a steep north-facing slope.
Pasqueflower and evening shadows.

As seems to happen nearly every time I visit this flower patch, there were some oil beetles around. If you don’t know the story of oil beetles and their relationship (?) to bees, please stop right now and read this post.

Oil beetles (Meloe sp.) on pasqueflowers.

Anyway, this is the only place on earth I’ve ever run into oil beetles, and I’ve never seen them doing anything other than eating pasqueflowers. As far as I can tell (from some quick Google searching), oil beetles have a pretty broad diet, but I’ve never seen evidence of that. In my world, oil beetles appear when pasqueflower blooms and then disappear for a year. My world is pretty limited, apparently.

The strong breeze added a few degrees of difficulty to my flower and beetle photography. I tried to wait patiently for brief dips in wind velocity and then pushed the shutter button lots of times, hoping at least a few images would turn out sharply focused. I guess it worked.

The next morning, we met early to get everything ready for the burn. We planned to burn about a square mile (645 acres, to be precise) of Sandhills prairie in our east bison pasture. The bison pasture is 10,000 acres in size and we were hoping the green vegetation coming in after this burn would be where the 500 or so bison (including this year’s calves) would focus most of their grazing this year – in addition to some other recently-burned patches. If they do that, they’ll leave the rest of the pasture mostly ungrazed and create a good mix of habitat conditions for plants and animals across the whole site.

This was my primary view of the fire all day.

I had a pretty easy job for most of the burn. I very slowly drove a truck carrying a couple hundred gallons of water along the mowed firebreak while someone else walked next to the truck and sprayed water on the ground to create a ‘wet line’ to help hold the fire. Periodically, I got to crawl out of the truck and take some photos while we waited for the ignition crew to catch up.

This crew member was widening the ‘black line’ on the downwind side of the fire. That black line is what stopped the fire later when it was ignited on the upwind side and ran across the unit.
Heat waves make abstract images.
Pausing to gauge progress.

Because we were in the bison pasture and the bison are there year-round, we got to watch some of them react to the fire. There wasn’t much to see. For the most part, they seemed wholly unbothered by what we were doing. Most of them sidled out of the way as we came near – in that kind of “I’m too cool to care” way.

Igniting with uninterested bison in the background.
A close-up of fire and heat waves. My telephoto lens made the flames look a lot bigger than they were.
New seasonal stewardship technician Sophie Epps got a lot of good experience on her first Sandhills burn. She also got a lot of exercise.
Sophie again.
This photo shows the mowed firebreak on the right and the black line being created along it to keep the fire contained. If you look closely near the red truck, you can see the wet line that helped keep flames from creeping through the mowed break.
Here’s one of the little eastern red cedar trees we cleaned up with the fire. It was growing next to the skeleton of one killed in a previous fire.

This was not a very intense fire, especially compared to many other prairie burns. The grass fueling the fire was relatively sparse, both because it’s the Sandhills and because patchy bison grazing made it that way. We probably ended up burning about 80% of the whole patch, but that was only because of some extra work at the end to light off areas that didn’t burn the first time. There were lots of lesser earless lizards, tiger beetles, grasshoppers, and other little creatures that probably sheltered in those unburned refuges – as well as in the thousands of unburned acres outside the burn unit.

Interior (and careful) ignition at the end of the fire to help the fire work its way across the whole burn unit.

It’ll be fun to watch the bison graze the new burned area this season. Some of them were already back inside the burned area as we left, checking it out. As soon as the vegetation starts to green up, they’ll be eagerly nipping it off, just as they’ve been doing for thousands of years.

The short, sparse habitat created by that grazing will be fantastic for animals like lesser earless lizards, kangaroo rats, band-winged grasshoppers, and horned larks, among many others. A lot of plant species will take advantage of reduced competition from grasses and other perennial plants being grazed by the bison. Many of those opportunistic plants will be wildflowers that will bring a bounty of nectar, pollen, and/or seeds and draw even more wildlife in to feed on them.

Maybe some oil beetles will fly in to feed on some of that plant diversity, too. If so, I probably won’t see them.

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About Chris Helzer

Chris Helzer is the Director of Science for The Nature Conservancy in Nebraska. His main role is to evaluate and capture lessons from the Conservancy’s land management and restoration work and then share those lessons with other landowners – both private and public. In addition, Chris works to raise awareness about the importance of prairies and their conservation through his writing, photography, and presentations to various groups. Chris is also the author of "The Ecology and Management of Prairies in the Central United States", published by the University of Iowa Press. He lives in Aurora, Nebraska with his wife Kim and their children.

8 thoughts on “Prairie Dogs, Pasqueflowers and Prescribed Fire

  1. They are all exceptional photos! However, the prairie dog photos are by far my favorite. They are incredible! They are not just images but a story.

    Thanks,

    Paula Matile
    KS TNC (but a former ND badlands prairie dog wildlife biologist who once could speak prairie dog 😊 – haven’t since I moved to KS Limestone)

  2. The oil beetle story (related herein and in the BBC video) is fantastic. I’d never heard of hypermetamorphosis. I missed the earlier 2018 post about the beetles; thanks for sharing. Howard Ensign Evans wrote a book about insects in the late 60s entitled “Life on a Little-known Planet” in which he lamented humans’ search for life on other planets when we understand so little about life on this planet; the oil beetle story is a perfect example.

    I live in Fort Collins, Colorado, and there are many heavily-visited natural areas in and near the city. The prairie dogs in those natural areas are pretty used to people. It’s relatively easy to photograph the prairie dogs without their retreating instantly to their burrows–and not requiring photographers to get sand spurs and cactus spines.

  3. wow what an incredible post! Reading it I’ve learned so much and again been reminded of the interconnectedness of all life on earth. You are an incredible photographer and writer, and your bits of humor just add to your posts. Thank you for your work and sharing it with us.

  4. Minor point – Meloe (Oil Beetles) are flightless. and they violate the one cardinal rule that identifies (nearly) all beetles – instead of the elytra meeting in a straight line down the middle of the back, in Meloe, the elytra overlap. The adults can only crawl over the ground and so dispersal is very dependent upon the bees they parasitize.

    gemmill@musc.edu

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