image of bumblebee and soldier beetle on swamp milkweed

The Value of Pollinators? Priceless

Image of margined leatherwing/margined soldier beetle
Wheee!!! It’s National Pollinator Week. This margined soldier beetle, his legs already awash in pollen, heads to another flower to continue the party.

We hear a lot about what other species can do for us, often through attempts to quantify their value in economic terms. Statisticians put pollinators’ contributions to U.S. food crops in the $15 to $30 billion range, and researchers have even calculated price points for individual species. Did you know, for example, that a single Southeastern blueberry bee has been found to visit nearly 50,000 blueberry flowers in a year, pollinating up to $75 worth of berries?*

Though the thought of all that effort heightens my admiration for both the animals and the scientists who have taken the painstaking time to study them, the ubiquitousness of this kind of “What’s in it for me?” framework gives me pause. Even the very word “pollinator” itself, at least as it’s often used now, is reductionist, singling out only one functional aspect among many that characterize this vastly diverse set of creatures.

The approach is understandable in a society plagued with short attention spans and even shorter-term thinking, but I fear that emphasizing the financial benefits we derive from animals may have the opposite of its intended effect. As Richard Conniff described so eloquently in a New York Times opinion piece, economic value is often successfully invoked to the detriment of our fellow species. “[U]sefulness is precisely the argument other people put forward to justify destroying or displacing wildlife,” he writes, “and they generally bring a larger and more persuasive kind of green to the argument.”

Around the time I read Conniff’s essay last fall, someone suggested I write a blog on the economic value of pollinators. I’ve tried, but the numbers are contradictory, and the story never seems to hold up. There’s a reason for that: Our pollinators—and indeed all the animals on this planet—have a priceless role to play, even if we humans haven’t figured it all out yet. Beyond what they do for us in the immediate present, the hard work of insects results in seeds and fruit that are critical to the diets of a quarter of our birds and many mammals. They’re also in and of themselves a meal for wildlife ranging from baby birds to foxes to bears. As the most diverse and numerous group of animals on the planet, insects are the very cornerstone of life itself. How can we possibly quantify that?

In honor of National Pollinator Week, I’d rather not talk about their financial value—which, as Conniff writes, should be obvious by now. I’d like to let these wondrous creatures—beautiful and strange and deserving of our respect and appreciation in their own right—help tell their stories through close-up views of their daily existence. Taken in only a couple of days this week on just a few plants, these photos gleaned tiny surprises I didn’t even see until I zoomed in. If only we could always train a macro lens on nature with our naked eyes, how much more would we understand of the bigger picture unfolding before us?

To be a bee or not to be a bee?

Image of trichiotinus piger (hairy flower chafer or bee-like flower scarab beetle)Image of Trichiotinus piger (hairy flower chafer, bee -like flower scarab) Watching the buzz around my possumhaw viburnums, my father and I wondered if these were baby bumblebees. They’re certainly fuzzy enough. But those little hairs captured so much pollen that it was hard to say for sure what lay beneath, and there was something about the bulkiness and movements of these insects that suggested a different species. Sure enough, they’re one of many that evolved to mimic bees, possibly to keep predators at bay. Commonly called the hairy flower chafer or bee-like flower scarab beetle, Trichiotinus piger also has some gorgeous headgear: a set of antennae that look like antlers or tiny twigs.

Peek-a-boo!

image of notch-tipped longhorn beetle on viburnumimage of notch-tipped longhorn beetle on viburnumAlso covered in pollen—to the point of looking like an albino insect (top)—were these notch-tipped flower longhorn beetles (Typocerus sinuatus). Only after finding one with a mere dusting of pollen (above) on another patch of possumhaw viburnum was I able to discern the markings. Beetles are thought to be the original pollinators, along with flies, appearing millions of years before bees.

Precision pollinator?

Image of Metacmaeops vittata on viburnum nudumIt was practically a beetle festival, with our new plantings of viburnum attracting a diverse crowd. This second type of flower longhorn beetle, Metacmaeops vittata, looked more smooth-bodied and less prone to masquerading in full-on pollen makeup while enjoying the open, flat blooms. Her larvae are wood borers, preferring tulip poplar—another abundant species on our property—as a host. When these plants produce nutritious pink and blue berries in the fall, the birds will have this and all our other industrious beetles to thank.

Don’t look at me—I’m plant debris!

Image of Himmelman's plume moth or grape plume moth on dogwood flowerIn trying to capture a photo of a small bee on this dogwood, I saw a reddish dangling bit hanging off the flower but didn’t think anything of it until I downloaded my photos onto the big screen. To my eyes, this creature looked like a piece of debris. And that’s how she likes it, apparently fooling a lot of species into thinking she’s a leftover plant part. So tiny that she’s sometimes grouped with an informal assemblage of moths called “microlepidoptera,” this is probably a grape plume moth or a Himmelman’s plume moth. Though many moths are considered important specialist pollinators, especially of night-blooming plants, the 10,000 species on this continent remain underappreciated. As the authors of the Xerces Society’s Attracting Native Pollinators note, “The muted colors of moths, their largely nocturnal lives, and the reputation of only a few species as crop or wardrobe pests results in their typically being overlooked at best or despised at worst.” I’m so grateful my camera was more attentive than I.

Accept no imitation?

image of bumblebee on lamb's earsThe real deal: Bumblebees have a lot of imitators in the animal world, but none quite so bumbly and fuzzy as the bees themselves. We have added lots of natives for them, but we also leave in place some long-ago planted lamb’s ear and catmint to help tide them over during the transition from late spring to summer blooms. This year we have had far fewer bees so far, an observation I’ve heard echoed by friends and colleagues around the country. Though we have not used chemicals of any kind in the landscape during the 15 years we’ve lived on this property, I can’t say the same for all my neighbors and have wondered if this is playing a role in the sudden decline.

This is my milkweed, too!Image of great spangled fritillary on common milkweed

Who says milkweed is just for monarchs? Many kinds of insects enjoy drinking from the flowers, eating the leaves, mating on the plants, and even eating each other in the milkweed patch (not necessarily all at once or in that order!). This great spangled fritillary has come to feed again and again on the nectar, keeping an eye out (or actually many eyes—butterflies have compound eyes with numerous lenses) for predators like me. I wish I could thank her and tell her I need nothing more from her; what she and her kind have already given us is far more than enough.

*This often-cited statistic is based on a 1997 study related to Southeastern blueberry bees in Alabama that was published in a journal of the International Society for Horticultural Science. Though the original research estimated the value at $20, recent citations have increased that number to $75, accounting for inflation in the price of blueberries. Subsequent research has shown varying levels of seed set in blueberries pollinated by this native bee, and scientists are looking at a number of different factors that influence pollination by these and other species. One thing’s for sure: Loss of habitat plays a key role in our native bees’ abilities to pollinate crops. As the Xerces Society pointed out in its book, Attracting Native Pollinators, transported honeybees are needed to supplement blueberry crops in Maine because wild bees lack consistent food sources from spring through fall.

12 thoughts on “The Value of Pollinators? Priceless”

  1. Want to let you know how much I enjoy reading your posts on the Humane Gardener. Your words make me want to do so much more to protect all wildlife. Thank you.

  2. Great photos and a great glimpse into the tiny world of bees and other pollinating creatures.

    Do you have an opinion on beekeeping as a way to help our buzzy friends? Would it be just as helpful to grow a bunch of plants to attract bees? More helpful? Less?

    My friends have kept bees for a few years, and done so very carefully, and their colony has collapsed twice. Poor bees.

    Oh, to have your eye … and your camera skills!

    1. Hi Catherine!

      Thank you so much! And that is a very good question. At this point I do think that growing plants to help native bees — and leaving patches of bare ground where you can so they can nest (as the majority nest in or near the ground) — is of critical importance. There’s a growing body of research showing how much we’ve underestimated native bee pollination abilities even of agricultural crops. And honeybees have been shown to displace native bees, at a time when native bees are in steep decline.

      Honeybees are obviously incredibly important to agriculture, but in our own home gardens and elsewhere, a focus on feeding the 4,000 native bees on the continent would go a long way.

      Here’s a really good blog by a bee researcher that addresses this: https://libereroblog.wordpress.com/2015/03/19/the-problem-with-saving-the-bees/

    1. Thank you, Diane! Yes, the animals always let me know by their response if I am planting the right thing! 🙂

  3. Great thoughts, Nancy! A friend reminded me that bees love clover, so I started promoting it in my lawn. I trim the weeds that sprout over it and the patches of white flowers look quite nice. Why have I been fighting clover in my lawn for years?! So silly, and maybe I even need to cultivate some milkweed on my front slope. But enough of this crazy talk! Thanks for generously sharing your knowledge!

    1. Thanks, Charlie! Yes, there are so many “weeds” in the lawn that are important to bees and other creatures. Violets are the host plant for fritillary caterpillars, but unfortunately they get mowed down and sprayed along with the rest of them. Recently I interviewed someone in Florida who said she studies weed-and-seed bags to find out what they kill — and then she figures out that a lot of those target plants are things the animals need. I can give you some milkweed seed if you want. I might grow some more from seed to plant in the fall, actually, so if I do I can give you seedlings. 🙂

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