Post-Grazing Party: Part 3 – Helzer Family Prairie

As I said back in early May, I’m spending a lot of my photography time in three 80×80-foot plots this summer. Each plot in part of a prairie that was grazed intensively most or all of last year. I’m hoping to highlight why I enjoy exploring places where the growth of normally-dominant plants (especially grasses) is temporarily suppressed from last year’s grazing.

Space and opportunities are opened for other plant species to flourish for a year or so until those dominant species hit full strength again. Generally, I see all the perennial plants I’m used to seeing, but they’re joined (temporarily) by a flush of short-lived plants as well.

In addition, the habitat structure is unique and interesting – especially as the season progresses. It often resembles a kind of miniature savanna, with wildflowers instead of trees towering over short grasses. It’s a habitat type preferred by many invertebrate and vertebrate wildlife species.

Pussytoes (Antennaria neglecta) went to seed in mid May at our family prairie. This is a long-lived rhizomatous plant that definitely enjoys the short habitat structure created by grazing.

Today’s post features the 80×80 plot at my family prairie, where I’m experimenting with the open gate rotational grazing. This is basically a big photo dump from about the last month or so. To make up for the large number of photos, I’ve kept the text to a minimum, but have hopefully included enough to give you some context. There’s a lot happening, and every visit I’ve made has resulted in some terrific photos.

Pussytoes and sunset.

Early in the season, the vegetation was pretty uniformly short. Pussytoes, only 6 to 8 inches tall, towered over the surrounding landscape. By mid-June, though, things have changed, with opportunistic wildflowers like yarrow and daisy fleabane growing more than two feet tall and providing an interesting mix of tall and short vegetation structure. That means animals have lots of choices between open, sunny areas and cool, shady cover.

Yarrow (with fleabane in the background) growing tall, surrounded by short grasses.
Mid-June in the part of our family prairie that was grazed intensively all last season. The orange flags mark the corners of my 80×80 foot plot.

The 80×80 foot plot at our family prairie is located on a slope I believe to be remnant (never plowed) prairie. There have been a lot of wildflower species blooming, and a lot more are getting ready. Many are native, but a few aren’t – though none are invasive or problematic.

Shell-leaf penstemon (Penstemon grandiflorus) is a species I’ve seeded into the prairie in recent years (from seed harvested nearby).
False gromwell, aka marbleseed (Onosmodium molle).
The flowers of false gromwell are closed at the tip, restricting pollinators to those strong enough to force their way inside and/or those with long tongues.
A lot of daisy fleabane (Erigeron strigosus) germinated last year during the grazing and is blooming happily this year before dying at the end of this season.

I’ve paid attention to how much fruit has been produced by ground plum in places that were grazed and ungrazed last year. The grazed areas, including my plot, have way more fruits on the plants than I see in the ungrazed sites. I wonder if that’s because they bloomed more prolifically, were pollinated more, or something else (or, likely, a combination of factors). Either way, it’s a stark difference.

Ground plum, aka buffalo pea (Astragalus crassicarpus) fruits.
Silver-leaf scurfpea (Pediomelum argophyllum) is a long-lived perennial that seems unaffected by grazing.
Peppergrass (Lepidium densiflorum) is a neat little annual that is doing well with the abundant light and low grass competition.
Goatsbeard, aka salsify (Tragopogon dubius) is a non-native wildflower I enjoy. It’s short-lived and profits from less competitive grasses.
The non-native legume black medic (Medicago lupulina) is one of the big winners in all three of my 80×80 foot plots this year. Next year, it will be drastically less abundant as grasses recover their vigor.
The invasive smooth brome (Bromus inermis) is found in pretty much every Nebraska prairie these days, but while it bloomed in my 80×80 plot, its minimal vegetative production showed how little competition it was able to provide in the community this spring.

The abundance of invertebrates is one of my favorite aspects of these post-grazing areas. They seem to be drawn to the combination of sun and shade in close proximity, which allows them to easily thermoregulate. A bonanza of wildflowers also draws a lot of pollinators, and that’ll become even more apparent over the next month or two as prairie clover (a particular favorite of bees) starts blooming.

Katydid nymph.
Grasshopper.
A blister beetle (Epicauta sp.)

I’ve photographed three ladybird beetles (ladybugs) in the plot so far this year, including the non-native seven-spotted ladybird and two native species.

Seven-spotted ladybird beetle (non-native)
Convergent ladybird beetle (native) on daisy fleabane, with an aphid, its favorite prey, shown at the top of the photo.
Parenthesis ladybird beetle (native).
Tiny beetle on stiff goldenrod (Oligoneuron rigida).
Reakirt’s blue butterfly.
There have been lots of wolf spiders running around on the bare soil.

There’s lots of patchy bare ground in the post-grazing portion of our prairie this year. That makes for great habitat for many invertebrates. It should also be great for ground-nesting bees. The other day, I saw what I thought was probably the entrance to a small bee’s nest and hung around to see if I could get a photo of the bee coming or going. I did manage to spot and photograph the resident, but it turned out not to be a bee. Instead, it was the larva of a tiger beetle – a group of species whose larva and adult stages both enjoy hunting in areas of bare ground.

Tiger beetle larva entrance.
Tiger beetle larva ready to hunt. If you click on the photo to get a bigger/clearer version you can get a much better view of its face.

I mentioned daisy fleabane earlier. It’s definitely one of the plant species that has benefitted greatly from last year’s grazing. While many people consider it “weedy” because it’s a biennial, it’s attractive and I’ve enjoyed watching all the diversity and activity taking place on it this spring.

Daisy fleabane (Erigeron strigosus)
A bug (showing its long mouthpart) hiding behind a flower.
A tiny bug (Lygus lineolaris?) feeding on daisy fleabane.
A fly infected by the Entomopthora muscae fungus. Read more here: https://prairieecologist.com/2024/06/25/early-summer-natural-history-stories/
Fly feeding on yarrow.

I’ll finish with a barrage of crab spider photos from this site. It’s been a great year for crab spiders at many of the prairies I’ve visited, but they seem particularly abundant here. They’re hanging around on lots of different flowers, hunting the many invertebrates coming to visit those blossoms.

Crab spiderling on pussytoes.
Crab spider on yarrow.
Crab spider on daisy fleabane.
Crab spider on silver-leaf scurfpea.
Crab spider on daisy fleabane.
Crab spider on daisy fleabane with captured fly.
Crab spider (male) on daisy fleabane with a setting sun behind it.
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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.

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