Photos of the Week – July 11, 2023

Quick Note: For those of you working on restoring (reconstructing) prairies, I’d encourage you to consider attending the 2023 Grassland Restoration Network workshop, which will be held in Windom, MN on August 22,23. This is an annual workshop that shifts locations each year but is always focused on learning from each other and improving the work we do in planting prairies – mostly on formerly-cropped land. Participants tend to be mostly from the Midwest and Great Plains, but we encourage participation from other regions! Interested? It would be fun to see you there. Learn more at this link.

Over the weekend, I spent a pleasant morning at our family prairie, exploring and checking in on the condition of the prairie. We’re still in a drought, but have had some recent rains that have turned most vegetation green again. I’ve been keeping a close eye on things, though, because we’re trying to decide whether or not to keep cattle in for the full growing season or not.

Katydid nymph on milkweed. Nikon 105mm macro lens. ISO 640, f/13, 1/250 sec.

I got distracted, though, from my rigorous assessment work by numerous katydid nymphs and dew drops. It was hard to walk past them without stopping to look more closely. Since I wasn’t on a strict schedule, I stopped. Many times.

Katydid nymph on foxtail barley. Nikon 105mm macro lens. ISO 640, f/14, 1/200 sec.

When I came across a patch of sparkling foxtail barley I paused for quite a while. There were numerous katydids and other invertebrates hiding among the long awns of the grass. It was fun playing around with various compositions that included both the insects and the backlit grass.

(Sparkling foxtail barley isn’t the official common name for the grass. Neither is it what you call foxtail barley that isn’t from France. It’s just regular foxtail barley (Hordeum jubatum) that happened to be covered with dew drops that glittered in the morning sunshine.)

Katydid nymph on foxtail barley. Nikon 105mm macro lens. ISO 640, f/14, 1/80 sec.
Katydid nymph on foxtail barley. Nikon 105mm macro lens. ISO 640, f/14, 1/80 sec.
Stink bug on foxtail barley. Nikon 105mm macro lens. ISO 640, f/14, 1/80 sec.
Foxtail barley (Hordeum jubatum). Nikon 105mm macro lens. ISO 640, f/16, 1/400 sec.

After leaving the foxtail barley, I kept strolling and found plenty more to photograph, including both plants and invertebrates.

Western wheatgrass (Pascopyrum smithii). Nikon 105mm macro lens. ISO 640, f/16, 1/200 sec.
Red milkweed beetle. Nikon 105mm macro lens. ISO 640, f/16, 1/250 sec.
Blister beetle on plains coreopsis (Coreopsis tinctoria). Nikon 105mm macro lens. ISO 640, f/16, 1/200 sec.
A green lacewing. Nikon 105mm macro lens. ISO 640, f/16, 1/200 sec.

Eventually, I came across a few patches of native thistle in the part of the prairie we grazed hardest last year. Both wavy-leaf and Flodman’s thistle were blooming, which pleased both me and numerous pollinators. However, both species were also demonstrating their ability to capture invertebrates on their sticky calyxes beneath the flowers. This is something I’ve seen and written about often, but it’s still always intriguing to see.

This year, some of the wavy-leaf thistle flowers had really done a number on some black ants. One flower had stopped blooming and, I think, had also started to lose some of its stickiness. As a result, I saw live ants crawling over the dead corpses of their relatives to reach and investigate the top of the flower. Morbid, but fascinating!

Ants stuck to wavy-leaf thistle (Cirsium undulatum). Nikon 105mm macro lens. ISO 640, f/11, 1/500 sec.

As always, ants weren’t the only insects to get stuck and die beneath thistles. Most prominent this year was a wasp I didn’t recognize who made an unfortunate choice in its overnight (probably) roost location. To be clear, it’s not that I didn’t know the individual wasp. I didn’t know what species of wasp it was, though I guess both are true.

A wasp stuck to Flodman’s thistle (Cirsium flodmanii). Nikon 105mm macro lens. ISO 640, f/16, 1/500 sec.
A halictid bee enjoying (I assume) feeding on wavy-leaf thistle. Nikon 105mm macro lens. ISO 640, f/16, 1/500 sec.

After several hours, I looked at the time and realized I should probably head home and get started on some other projects. Depending upon how you measure productivity, I either had a very unproductive morning or a perfectly productive one. I tend toward the latter perspective, I think.

It’s nice to have the time to be distracted without guilt. I hope you all can find time for similar intentional distractions in a prairie near you!

Tree cricket on hoary vervain (Verbena stricta). Nikon 105mm macro lens. ISO 640, f/16, 1/250 sec.
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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.

12 thoughts on “Photos of the Week – July 11, 2023

  1. Lovely photos and most interesting details. I am interested in learning more about native thistles and native sedges. Can you suggest a good book or website?

    • Hi Paula,
      I’m not sure I can recommend a single book. Field guides, of course, are helpful in learning the identification of the species, but the right one depends on where you’re from. If you give me a location I can see if I can help you find good ones. Otherwise, I’d suggest Googling some of the species to see what you can learn, though that’s not a very creative suggestion…

  2. Wow, I’m always fascinated by your vividly clearly closeup photos of insects. Always important to stop, look down, ‘get down close’, and see the little critters on the plants. Such variety of ‘everything’. Thanks Chris!!!!!

  3. The phyllaries on Cirsiums are one of my favorite places to check for stuck insects and not just ants. I find that no one kind of insects is caught more often.

    Are thistles (Cirsium) a carnivorous plant or just a protocarnivorous, or borderline carnivorous? I have often wondered about this for the thistles. In my observations in North Texas the resins produced only happen after the weather gets hot. Additionally not all the thistles produce the resins even in the hot weather. I read an article a few months ago about a tropical plant that catches insects with it resins then digests it. However it only did this when the plant was really stressed. https://www.sciencetimes.com/articles/44125/20230603/elusive-part-time-carnivorous-plant-becomes-meat-eaters-when-nutrient.htm

    So this makes me wonder if the thistles might do something similar?

    Others found that the some assassin bugs use the plant resins to protect its eggs. https://academic.oup.com/aesa/article/100/2/320/8421

    Still another paper on assassin bugs that put the resin directly on themselves to help capture prey. https://www.sciencealert.com/scientists-discover-a-rare-example-of-insects-using-tools-to-capture-prey

    So maybe the thistles’ resins are more than just for defense? Just a thought.

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