Mark Brunson, Author at Wild About Utah

Author: Mark Brunson

Mark Brunson recently retired as a professor of Environment and Society at Utah State University, and he continues to study how people affect natural environments and are affected by them, especially in the deserts of the Great Basin and Four Corners regions. Mark is passionate about connecting science to people who can benefit from it. He has led outreach programs for land managers about wildfire and ecological restoration, and he serves as science director for The Nature Conservancy’s Canyonlands Research Center while also working with two Utah-based conservation nonprofits, Bear River Land Conservancy and Sageland Collaborative.

Cuckoo bees: Indiscriminate Cuckoo bee Courtesy & © Mark Brunson, Photographer — Indiscriminate Cuckoo Bee
Courtesy & © Mark Brunson, Photographer

Indiscriminate Cuckoo Bee
Courtesy & © Mark Brunson, Photographer

Indiscriminate Cuckoo bee Courtesy & © Mark Brunson, Photographer — Indiscriminate Cuckoo Bee
Courtesy & © Mark Brunson, Photographer

Indiscriminate Cuckoo Bee
Courtesy & © Mark Brunson, Photographer

I’d like to tell you a crime story. At least, it would be a crime story if told from a human perspective. But is it still a crime story if it’s about the natural world? I’ll tell it and then let you decide for yourself.

First let me set the stage: Not long ago I was hiking in Northern Utah’s Bear River Range. It was the height of wildflower season, and I was enjoying the colorful variety of blossoms along the trail. I stopped to admire a tall, showy plant with dozens of purplish-green blossoms: Frasera speciosa, commonly known as monument plant or green gentian. It’s often seen near the top of Logan Canyon, but what struck me about this particular monument plant was that it was full of bumble bees.

I knew that a Utah-based conservation science organization, Sageland Collaborative, is asking community volunteers to help them measure bumble bee diversity in the state, so I took out my phone and snapped a few photos. Later I uploaded the best photos into an app called iNaturalist so they’d end up in the Utah Pollinator Pursuit database maintained by the Utah Division of Wildlife Resources with Sageland’s help. Then I waited to learn what species of bumble bee I’d seen. The answer came back: indiscriminate cuckoo bumble bee. I thought: What an unusual name. I needed to know more.

It turns out “indiscriminate” simply means that, unlike many native bees that are particular about what they eat, this species doesn’t much care where it gets its nectar. As for “cuckoo”? Like the birds they’re named after, these bumble bees are thieves.

Or to say it more scientifically: these bumble bees are kleptoparasites. Parasites – animals that take resources they need from other species to the detriment of those species – and “klepto,” as in stealing. Like cuckoos or cowbirds, they lay their eggs in the nests of other bumble bee species, letting the workers from the host species do the work of raising them.

Here’s where our crime story gets even more sinister. When a cuckoo bumble bee queen finds a suitable nest to rob – one with a good-sized group of workers to raise the bee larvae, but not so many workers that they can easily protect their queen – she kills the host queen and becomes part of the colony, laying her alien eggs for the host workers to feed.

Cuckoo bumble bees don’t need their own workers, so they’re less often seen on wildflowers. In fact, there’s a good chance that some of the other bumble bees on my monument plant – the ones I didn’t get a picture of – were members of the host species. They also don’t need to take pollen back to a nest of their own, so they don’t have those “pollen baskets” we often see on the hind legs of female bumble bees.

But they do move pollen from flower to flower when it sticks to their bodies as they feed. In other words, they do play a role in sustaining the wildflowers we enjoy every summer. So is this really a crime story? Or is it just another example of the amazing diversity of behaviors found in nature? While you’re deciding about that for yourselves, I hope you get a chance to enjoy watching Utah’s various kinds of bumble bees as they do their all-important work.

I’m Mark Brunson, and I’m wild about Utah’s native bees.

Credits:

Images Courtesy & Copyright Mark Brunson, Photographer
Featured Audio: Courtesy & © Kevin Colver, https://wildstore.wildsanctuary.com/collections/special-collections and J. Chase and K.W. Baldwin. https://upr.org/
Text: Mark Brunson, https://www.usu.edu/experts/profile/mark-brunson/
Additional Reading: Lyle Bingham, https://bridgerlandaudubon.org/

Additional Reading

Wild About Utah pieces authored by Mark Brunson

Sheffield, Cory S., Cuckoo bees, Epeoloides pilosula, The Xerces Society, https://www.xerces.org/endangered-species/species-profiles/at-risk-bees/cuckoo-bees

Smale, Parker, Understanding cuckoo bumble bees: terrors or treasures?, Wildlife Preservation Canada, February 29, 2024, https://wildlifepreservation.ca/blog/understanding-cuckoo-bumble-bees-terrors-or-treasures/

Barth, Amanda, The Unique Lives of Cuckoo Bees, Sageland Collaborative, July 25, 2024, https://sagelandcollaborative.org/blog/2024/7/25/the-unique-lives-of-cuckoo-bees

Ute Ladies' Tresses at the Mendon Meadow Preserve, Bear River Land Conservancy, Courtesy & © Mark Brunson, Photographer — Ute Ladies’ Tresses, *Spiranthes diluvialis*, at the Mendon Meadow Preserve
Bear River Land Conservancy
Courtesy & © Mark Brunson, Photographer

The Mendon Meadow Preserve
Bear River Land Conservancy
Courtesy & © Mark Brunson, Photographer

Bumblebee on Ute Ladies’ Tresses at the Mendon Meadow Preserve
Bear River Land Conservancy
Courtesy & © Mark Brunson, Photographer

The Mendon Meadow Preserve, Bear River Land Conservancy Courtesy & © Mark Brunson, Photographer — Ute Ladies’ Tresses, *Spiranthes diluvialis*, at the Mendon Meadow Preserve
Bear River Land Conservancy
Courtesy & © Mark Brunson, Photographer

The Mendon Meadow Preserve
Bear River Land Conservancy
Courtesy & © Mark Brunson, Photographer

Bumblebee on Ute Ladies’ Tresses at the Mendon Meadow Preserve
Bear River Land Conservancy
Courtesy & © Mark Brunson, Photographer

It’s a warm summer evening on the west side of Cache Valley, where a small group of volunteers has gathered beside a green pasture. We hear the rattling bugle calls of sandhill cranes in the distance. A Swainson’s hawk scolds us as it circles overhead. As we walk into the field, our steps disturb dragonflies and leopard frogs. But we’re not here for the wildlife. We’re after something rarer: orchids!

Wait, what? Orchids? You mean those delicate tropical plants with colorful blossoms that city folks grow in humid greenhouses? Well, yes actually. It turns out that orchids grow on almost every type of land surface across the globe, including some in Utah.

The orchid we’re seeking has drawn the attention of the federal government. You see, while the orchid family has nearly 28,000 species worldwide, many of those are rare. The one we’re looking for, called Ute Ladies’-tresses, is on the federal Threatened Species list, which gives it legal protection from human impacts until it’s no longer at risk of disappearing.

In Cache County, Ute Ladies’-tresses are guarded by the Bear River Land Conservancy, a nonprofit whose mission is to protect open space and working farms and ranches in northern Utah. After orchids were found in a pasture near the small town of Mendon, the Conservancy received funding to purchase and manage the land in ways that could help the orchids to thrive, and to provide data to the U.S. Fish and Wildlife Service about how the population is doing.

That’s why we volunteers are gathered in a pasture on a Friday evening. Our job is to carefully walk the property, looking for blossoms. When one of us sees an orchid in bloom, we mark the spot with a bamboo plant stake. Then someone trails along behind them – usually that’s me – and records the location using a global positioning system. By taking these GPS measurements, we not only count how many plants have flowered that year, but we also map their locations to learn where we might be losing or gaining orchids over time.

Ute Ladies’-tresses has narrow leaves, hard to distinguish from the surrounding grasses and sedges and rushes. But then it sends up 1-5 flower stalks, up to a foot high. Each stalk has numerous small white flowers arranged in a graceful spiral. The plant likes to grow on solid ground that floods at some point in the year – a streambed that’s dry except during spring runoff, or a flood-irrigated pasture like the one in Mendon. At our site, the first flowers emerge around Pioneer Day, and new ones continue to appear till about Labor Day.

Monitoring this population since 2013, we’ve learned a lot about Ute Ladies’-tresses. One key finding is that flower numbers fluctuate widely from year to year. Our highest count was nearly 2,000 flowering specimens in 2017. But in the very dry summer of 2021, we counted fewer than 30. That year was scary if you’re trying to protect a rare plant, But these orchids live for several years, flowering only when conditions are right, and last year we found more than 1,400.

You see, even if a plant is rare, that doesn’t have to mean it’s fragile. Some rare plants are, to be sure, but Ute Ladies’-tresses is resilient. In fact, last fall the Fish and Wildlife Service proposed removing the species from the Threatened list. One reason they feel they can do so is the continued protection it gets from groups like Bear River Land Conservancy. And so I look forward to many more August evenings in a Mendon meadow, sharing time with this lovely orchid.

I’m Mark Brunson, and I’m wild about Utah’s rare plants.

Credits:

Images Courtesy & Copyright Mark Brunson, Photographer
Featured Audio: Courtesy & © Kevin Colver, https://wildstore.wildsanctuary.com/collections/special-collections and J. Chase and K.W. Baldwin. https://upr.org/
Text: Mark Brunson,
Additional Reading: Lyle Bingham, https://bridgerlandaudubon.org/

Additional Reading

Wild About Utah pieces authored by Mark Brunson

Ute Ladies’ Tresses in Wet Pasture, Bear River Land Conservancy, https://www.bearriverlandconservancy.org/mendon-meadows

Ute Ladies’ Tresses, Utah Species, Fieldguide, Utah Division of Wildlife Resources, State of Utah, https://fieldguide.wildlife.utah.gov/?species=spiranthes%20diluvialis

Species Profile for Ute ladies’-tresses (Spiranthes diluvialis), US Fish & Wildlife Service, https://ecos.fws.gov/ecp/species/2159

Delmatier, Charmaine, Ute Lady’s Tresses (Spiranthes diluvialis), Plant of the Week, USDA Forest Service, 2016, US Department of Agriculture(USDA), https://www.fs.usda.gov/wildflowers/plant-of-the-week/spiranthes_diluvialis.shtml

St. John, Loren, Ogle, Dan, USDA NRCS, Ute Lady’s Tresses Spiranthes diluvialis Sheviak, Natural Resources Conservation Service, US Department of Agriculture(USDA), https://plants.usda.gov/DocumentLibrary/plantguide/pdf/pg_spdi6.pdf