As winter suddenly tightens its grip on us here in Minnesota (it’s snowing outside as I write this, and cold), it’s the perfect time to sit back and do some reading and to reflect on this past summer’s encounters. This means more poetry, more desk work, and more blog posts.
On a recent visit to the college library to retrieve a book about the ecology of tropical bees, I found a slim pamphlet standing near it on the same shelf. Picking it up and opening it, I saw that it was a published lecture given April 22, 1970, at Utah State University by George Edward Bohart. Bohart was an internationally recognized expert on pollination biology and a professor at USU. (Interestingly, his brother, Richard M. Bohart, was another well known entomologist, founder and namesake of The Bohart Museum of Entomology at the University of Califonia, Davis.)
In his lecture, The Evolution of Parasitism among Bees, Bohart discusses the various bee families and the parasitic black sheep among them: from honey-robbing honey bees and resource-pillaging stingless bees to cuckoo bumble bees displacing rightful queens from established nests and myriad kleptoparasites stealing into nests of solitary bees and laying their eggs upon pollen stores not rightfully their own. The trickery involved in parasitism must be quite successful in the grand scheme of things given the abundance and variety of parasitic species. For example, Bohart points out that just among the bees “morphological evidence indicates that existing parasitic lines were derived at least 16 times from non-parasitic ancestors.” (emphasis mine) This lecture reminded me of the interesting parasitic bees I’d encountered, in particular the host prey pair discussed here.
In 2014, I encountered, for the first time, Holcopasites calliopsidis, a brightly colored but tiny parasitic bee that targets the mining bee Calliopsis andreniformis (a fact reflected in the species name of the parasite). At 5 mm in length, this bee is smaller than a grain of rice. A single photograph, mid August, taken as the bee nectared on fleabane (see photo above). I revisited these flowers many times that autumn and the following year and did not encounter this bee again.
This summer I had much better luck. One day in June I noticed a number of tiny bees at several patches of hard-packed, bare ground along the walking trails in the St Olaf Natural Lands. These turned out to be Beautiful Mining Bees, Calliopsis andreniformis. Again, grain-of-rice-sized, though perhaps a millimeter or two greater in length than the aforementioned species. On subsequent visits to the same locations, I was able to get very good photos of these small bees, both the females and the surprisingly different males, with their lemon-yellow legs, face and antennae. According to the description in The Bees in Your Backyard, almost all the bees of the genus Calliopsis are specialist pollinators. Unfortunately, I was unable to observe which particular plants Calliopsis andreniformis had been visiting at this location. (A photo on Bugguide by Heather Holm shows this species on Blue Vervain at a nearby location in Minnesota, and that’s one possibility here as well.)
My good luck continued. Several times while watching the mining bees, Holcopasites calliopsidis showed up, snuffling the ground with their antennae, searching the nesting sites of their hosts. After I had several photographs of Holcopasites calliopsidis, I began to notice that this bee almost always kept its wings tucked under its abdomen. A curious and unique behavior. I haven’t been able to locate any explanation or even mention of this behavior. Considering the bee’s equally unusual colors and patterning, it seems at least plausible that the bee is mimicking the appearance of lady beetle larvae. I’ve included a photo by Katja Schulz of a Convergent Lady Beetle for comparison. If anyone has any alternative theories…I’d like to hear them.
Bohart, G. E. 1970. The Evolution of Parasitism among Bees. Utah State University.
I’m pleased to announce the publication of A Photographic Guide to Some Common Wasps and Bees of Minnesota. The last nine months I’ve been hard at work organizing, editing and writing this guidebook. It all began with the simple thought last October after the realization that I had photographed over one hundred species of wasps and bees…I know, I’ll put together a little book. Well, what at first seemed a straightforward and reasonable project, quickly consumed nine months. I hope it was time well spent, that the book will be useful and enjoyable.
In the end, I was able to include photos and descriptions for over 125 species (see sample page below). Also included are an introductory essay, a list of North American Hymenoptera families, and an index of scientific and common names. The book is available for purchase direct from me via PayPal at the book’s website or by sending a check for $28 (includes shipping) payable to Scott King to the 307 Oxford Street Northfield MN 55057. If you prefer a pdf for use on a tablet, that is available for $10. (176 pages, ISBN 978-1523208319)
ISLANDS have fascinated people for a very long time. Think of creation myths like Turtle Island or the numerous accounts of catastrophic floods. Think of Odysseus’s misadventures among the Aegean Islands. Think of the vikings who discovered and settled Iceland and wrote the sagas. Think of William Shakespeare and the magical island of The Tempest. Think of Herman Melville and the grim, volcanic islands recounted in The Encantadas or Robert Louis Stevenson and the buccaneers and buried gold stashed inside the covers of Treasure Island. Here’s a list that could go on and on, yet, even curtailed, it’s an island list redolent of mystery and adventure.
Many early scientists, explorers, and naturalists expressed a penchant for islands, some as ardently as the storytellers. Most preeminent being Alfred Russel Wallace and Charles Darwin. Wallace collected insects and birds among the islands of the Malay Archipelago, wondering what might explain their distributions and variations. Darwin puzzled through similar oddities encountered on the many islands he visited during the five-year voyage of the Beagle, resulting…eventually…in his theory of natural selection. During the century and a half since Wallace and Darwin, numerous scientists have focused their research upon the natural laboratories that are islands—Ernst Mayr, E. O. Wilson, and Peter and Rosemary Grant to name but a few. The big story of island biogeography, its rich history and relevance to modern times, has been masterfully told by David Quammen in his magisterial book, The Song of the Dodo.
Biogeographers study the distribution of plants and animals—which species live where, and why—bringing to prominence the role geography plays in the process of evolution. Island biogeographers study the same thing, only with a focus on the more restrictive and clarifying setting of islands, delineating the special role isolation plays in the formation of new species.
Two main factors influence the formation of new species on islands: location and size. If an island is small or close to the mainland nothing too extraordinary happens. On the other hand, if an island is large or distant enough from other land masses so that vagrant species arrive only with great irregularity over great spans of time speciation is more likely to occur among the plants and animals that happen to make it to the island and that survive to establish populations. Extinction plays a role as well. As evolution’s unavoidable shadow, extinction reduces and subtracts and trims island diversity, this permanent negation creates an absence that new species might fill.
In August, I had the privilege to visit Mallard Island, an island of some renown on Rainy Lake in Minnesota, a mile or so from the Canadian border. The island is a lance-shaped skelf of bedrock, one and a half acres in size (an area roughly equal to that of a football field), covered in pine and lichen and moss. The island’s notability can be credited to Ernest Oberholtzer (1884 – 1977), who occupied the island for some forty years beginning in the 1920s. During those four decades, Oberholtzer constructed a number eccentric dwellings and outbuildings upon the island, built various stone walls, bridges, and gardens, amassed a library of more than 10,000 books, and helped protect a vast amount of wilderness, work that led directly to the establishment of Voyageurs National Park and the Boundary Waters Canoe Area Wilderness. And, near the end of his life, he created the Oberholtzer Foundation in order to preserve the rugged and secluded charm of his beloved island—and bring forward his conservationist legacy.
As member of a small group of people invited to stay on the island for one of the Oberholtzer Foundation program weeks, I arrived Sunday afternoon ready for six days of intense reading, new conversations, and an abundance of time out-of-doors. The focus of this week’s program, as laid out by the organizers, was on art and science. The purpose, and our purpose in participating, was to expand our views, to strengthen our resolve, to collaborate across the distances and differences, all with an eye to the economic and environmental struggles that we all are facing and which will only intensify in the years to come as human populations increase and resources dwindle.
Now, according to some people, powerful spirits inhabit Mallard Island. Inanimate objects like books are said to leap into your hands as if in magical apprehension of your wants or shortcomings. And while I do my best to respect the angels and demons encountered by others, I have to say right off that I’m a skeptic in my own sphere, content enough with the wonder-filled world as it is, finding any superadded spirit world unnecessary. Nonetheless, I’ll admit it can seem uncanny, in such a sweeping assemblage, to immediately find a book that is extraordinarily apt and directive. For instance, as soon as I had the opportunity to look at books I happened upon a copy of Shan Walshe’s Plants of Quetico and the Ontario Shield. “There are occasions when luck goes farther than wisdom” I’d read recently, and this is true. Thus I allowed my luck to direct my activities for the week. For the next few days I would unburden myself of the role of writer, turn truant from the island’s other books (as best I could), try my hand at some botany, conduct a little island biogeography.
Realizing full well that most island biogeography happens on oceanic islands not islands on freshwater lakes, I didn’t expect to discover any endemic species or any vast differences among these small islands. Rather I expected them to be similar and express only subtle differences. Separated by less than a mile of water from the mainland, having strong “land communication” to use Wallace’s term, the flora and fauna should be nearly identical across the islands and representative of the fire-dependent, northern forest ecosystems that covers much of the Canadian Shield. However, some small variations could be expected, reflecting the happenstance of slight differences in physical shape, human habitation and use, and microclimates.
I took photographs. I made lists. I mapped the flowers as if I were a bee. My entomological surveys consisted of two nights of mothing and various incidental encounters with other insects. My botanical surveys consisted of daily excursions and rambles: a hike on Crow Island, from tail-feathers to beak; fishing the circumference of Gull Island, noting the trees and shoreline vegetation; an east-to-west ramble the length of Mallard Island, pen in hand; an afternoon exploring Hawk Island; a paddle into the long, marshy bay of Grassy Island; a boat ride to Blind Bay in Canadian waters (thanks to the generosity of fellow naturalist Mary Lysne); ending the week with a second trip to Crow Island.
Midway through the week, on Wednesday afternoon, I visited Hawk Island. To get there I waded the narrow channel separating it from Mallard Island, shoes in hand, camera slung over my shoulder. Barefooted, I could feel the ridges and recesses in the bedrock. The stone underlying the islands had formed many millions of years ago. Those original rock strata had been broken, turned on edge, and scoured by glaciers. Only the stars overhead at night were older.
Once across the channel, the only way onto the island was up a steep rock face, so I climbed and entered the woods. My transect of exploration sliced across the middle of the island. Reaching the abrupt cliffs that define the south edge of this island (a pattern interestingly repeated on the other islands), I veered and puzzled my way to the eastern tip, where the bare rock thins and dips beneath deep lake water the color of iced-tea. From there I worked back. A few flowers on the wave-beaten rocks, Hedge Nettle and Grass-leaved Goldenrod, before the Jack Pine and Reindeer Lichen and mosses thickened as I climbed inland. In a small, mossy clearing, I came upon a beaver skull missing the bottom jaw, turned to reveal the upper teeth. The clean, white bone of the skull brightened the forest floor. Here was a reminder that there existed a time element to this timelessness; islands come and go; species evolve and go extinct.
On hands and knees I inched as close as I could to a shiny, brassy-green soldier fly that had perched on a blueberry leaf. After it flew, I sat back. A few deep breaths. A few hearty exhalations, sighs of satisfaction and gratitude for this time, for this place. Then I moved on, continuing this fine-scale perusal of the surroundings. I smiled at pixie-cup lichens so small that a single drop of rain would overfill one. I shook my head in wonder at the clubmosses so perfectly replicating the form of trees on a miniature scale. I made my way across a seemingly stochastic quilt of vegetation, and yet I knew that it wasn’t purely random, but patterned in subtle ways. Eventually I reached the edge of the forest where the bedrock drops away. Time to return to the other island. Though before I left, taking a final glance back, the forest produced a parting surprise, a ghost plant, a small clump of Indian Pipe.
Even as I began to learn the names and recognize certain patterns of occurrence, I was humbled by the sheer abundance and complexity of these small islands. Goethe once wrote of Rome that “the immensity of the place has a quieting effect. In other places one has to search for the important points of interest; here they crowd in on one in profusion… One would need a thousand styluses to write with. What can one do here with a single pen?” Wild, unbounded nature, not urban complexity, confronts one here and leaves one the task of organizing its subtle immensity into the simplicity of a few paragraphs. How does one write a long, slender island into an essay? A splinter of schist, a sliver of seed must be forced into a simple sentence that proceeds: noun, verb, stop. Or elaborated, the serendipitous occurrences of flower and insect and observer intersecting at a moment in time on an island gets written into a sinuous sentence, full of detours and wrong turnings, break downs and bad luck, or simple exuberance, the description going all out, on and on, forming a widening interior, fattening the page, where eventually the reader walks out of the forest and finds the shore at land’s end.
On Thursday, after some morning reading—sonnets by Conrad Aiken, a natural history of worm-lions by Morton Wheeler—I took oars from the rack on the side of the library and headed off on a return visit to Crow Island. I rowed past Japanese House on the westernmost tip of Mallard Island, then past Fawn Island, rounding the westernmost tip of Crow, doubling back into a small bay, beaching the boat at the landing, snug in a thicket of sweet gale. Once on land, I worked my way up to the sunlit outcroppings, hoping to find and photograph a Dragonhunter, a large dragonfly I’d seen flying and landing on the waterside ledges just the day before. When no dragonfly materialized, I fell into surveying the plants.
All week I’d stepped carefully around bumble bees nectaring on oregano that grew in thick patches in and out of the rock gardens on Mallard Island. Several times I stopped for a closer look at the handsome workers. Tri-colored Bumble Bees (Bombus ternarius), attractive yellow, orange and black bumble bees, are small, not much different in size than a honey bee, though fuzzier. Their abundance indicated a thriving population, with perhaps a number of hives located nearby. Now, as I prepared to leave, a very large bumble bee, much larger than the workers observed on the other island though patterned the same, buzzed by me and landed on the ground. It, also, had arrived on the island looking for something. I watched the bee as it searched about the pine needles and duff. It started to dig, disappearing into the dirt. How curious. My first thought was that it had entered a hive…but when no other bumble bees came or went, I realized that wasn’t correct. Then I remembered the abundance of bumble bees from the other island—the hidden hives—the workers working the oregano flowers, had succeeded in producing queens, the goal of their summer labors. Though it seemed early in the year, with next year’s summer certainly a long way off, this queen was likely searching out a hibernaculum, a safe place to wait out the winter and dream bumble bee dreams.
Here was a being adept at finding its way about the world. Another kind of island biogeographer in fact, locating suitable sites for hives, mapping the flowers. The shooting stars, which the other residents and I had witnessed in the night sky this week, were not more wondrous than this, nor more rare. To see this, to think about this had something to do with presence and absence…of leaving and longing to come back.
In the end, I realized that I would be returning home to my own small island of house & family. The small city lot on which our house sits surrounded by so many groomed and lawn-care-tended plots is certainly a kind of island refuge for insects and weeds. And the city parks and college natural lands that I often visit, while not islands surrounded by water, are engulfed by vast acreages of agricultural and urban/industrial development (for many plants and animals a far more treacherous crossing than water) making them islands as well. In fact, our increasingly fragmented landscapes make islands everywhere. Which is the very reason the science of island biogeography plays an increasingly important role in wildlife conservation and preservation.
A quick note about the following list: The first and most obvious caveat is that the list is not complete; I missed and overlooked many species, nor did I survey each island equally, nor did I include animals and insects. Secondly, links are provided for photo observations that have been submitted to iNaturalist.org, a crowd-sourced species identification system and database. If you notice something that’s been misidentified please let me know.
* Fire-dependent indicator species
‡ Inland Lake with Boulder Shore indicator species
MacArthur, R. H. and E. O. Wilson. The Theory of Island Biogeography. Princeton Landmarks in Biology Edition. 2001
Minnesota Department of Natural Resources. Field Guide to the Native Plant Communities of Minnesota: the Laurentian Mixed Forest Province. Ecological Land Classification Program, Minnesota County Biological Survey, and Natural Heritage and Nongame Research Program. MNDNR Saint Paul, MN. 2003.
Quammen, David. The Song of the Dodo: Island Biogeography in an Age of Extinctions. Scribner. 1996.
Walshe, Shan. Plants of Quetico and the Ontario Shield. University of Toronto Press. 1980.
“Men that look upon my outside, perusing onely my condition, and fortunes, do erre in my altitude; for I am above Atlas his shoulders.”
Written by Sir Thomas Browne some centuries ago in his work Religio Medici, this sentence caught my attention when I first encountered it some years ago and it continues to fascinate me. The image of Atlas is curious. I always picture this god holding the earth on his shoulder, then inevitably wonder, not how heavy it must be, but where could he be standing. What is below Atlas his feet? And I admire the surprising use of the word “altitude.” But ultimately I suspect the main reason this sentence resides and rides along in memory is its sound, the syntax and cadence, especially that final phrase zeroing in on the shoulders.
Because my thoughts tend to dash off on wild tangents when reading, I sometimes (more often than I should care to admit) miss the point, and missing the point of this sentence by Browne would be especially embarrassing given that the sentence is about misreading, about errors in judgment. So let me change directions and get to the point of this blog entry, the point being that I did err in my estimation of the month of April.
Just as it’s possible to err in the estimation of a person’s “altitude,” it’s also possible to mistake the weather. By and large the general consensus of the weather throughout the month of April was that it was the pits, that it wasn’t fit for man nor beast. Perusing the conditions at my window or on the computer screen I too easily agreed. I was convinced spring wasn’t coming. The days linked together to form a malicious, unwelcome limbo. Each afternoon seemed to lose its way between melting ice and freezing water. However much I griped and kept from venturing out, the world beyond our snow-spattered windows found enough sunlight and warmth to get on about the business of changing seasons.
Judged by the list of first-of-the-year sightings—the first Chorus Frogs, the first Sandhill Cranes, the first mining bees, the first dragonflies, the first flowers, Scilla and Sanguinaria on the ground, Salix and Acer overhead —spring undoubtedly arrived in April. The ice went out. The grass turned green. Underneath the shroud of inclement weather, snow falling even to the final days of the month, the soil unthawed, the buds burst, and the insects awoke.
A Sting in the Tale: My Adventures with Bumblebees by Dave Goulson is due out in the United States from Picador at the end of April. By ordering a used copy of the English edition that was printed last year, I was able to jump ahead and read it in advance. Anyone with even a fleeting interest in native pollinators, in habitat loss, in agriculture, or in conservation will want to order this well-written, often-entertaining book. Combining memoir and natural history into a near perfect blend, Goulson gives us tales of tagging and tracking bumblebees, of grad students paired up with bumblebee sniffer dogs, of reintroducing locally extinct populations, all the while giving clear explanations of the science involved and the current research being done. If you’re already a bumble bee aficionado, who perhaps, like my daughter, enjoys watching and petting these big fuzzies while they visit summer flowers, I know you’ll enjoy this book immensely.
In one of the final chapters, Goulson admits to what must be a common frustration for scientists and researchers: “one might find out everything there is to know about bumblebees, and publish it for others to read in scientific journals, but only a handful of other scientists would read it and it would not result in there being one more bumblebee in the world.” Because of his knowledge and the need to get something done, Goulson founded the Bumblebee Conservation Trust, a non-profit charity “for the bumblebees” with the goal of raising awareness of endangered bumblebees and bumblebee conservation among farmers and land managers and gardeners, people in a position to improve habitat and increase the number of bumblebees in the world.
While most of the science and natural history in this book relates to the UK, much of it applies equally well to our North American bumble bees and their conservation needs. (One difference being the spelling of “bumble bee”–the convention seems to be two words here, but a single word in the UK. If we look back more than a century, we find “Humble-bee” in use by Ralph Waldo Emerson and Charles Darwin, because of the hum the bees make when flying). In North America, with one of our native species believed to be extinct, Franklin’s Bumble Bee (Bombus franklini), and numerous other species numbers in alarming decline, it’s obviously time to do something for our bumble bees as well.
Fortunately, many people here in the states have been hard at work protecting bumble bees for some time. The Xerces Society, which has been involved with protecting and raising awareness of native pollinators for many years, has recently helped to launch Bumble Bee Watch, a citizen scientist survey and monitoring project and website. As soon as I learned of this site, I searched through my old photos for some that I could submit. I didn’t find many. Bumble bees are difficult to photograph—they rarely stay still and if they do, their head is buried out of sight in the petals of the flower they are visiting. Out of three years of photos, I was more than a little disappointed to find only four bees to submit. Even still, it was satisfying to make even this small contribution to this wonderful new project.
Last spring, aided by a copy of Befriending Bumble Bees: A Practical Guide to Raising Local Bumble Bees by Elaine Hodges, Ian Burns, and Marla Spivak, I attempted to rear bumble bees. I built the small boxes for the queens, in some ways like match-box size rabbit hutches. Rolled pollen balls. Prepared nectar. Captured and detained four separate queens: one Common Eastern Bumble Bee (Bombus impatiens) and three Two-spotted Bumble Bees (Bombus bimaculatus). None of them nested. I think my mistake was that I didn’t keep the queens in the starter nests warm enough (last spring was not an average spring, resembling rather a two-month extension of winter). When the queens didn’t show signs of nesting, I set them free. Hopefully this year I’ll have better luck coaxing a couple queens into starting a nest. Beyond the satisfaction and entertainment of rearing a colony, it seems useful to pursue the possibility of providing some local farmers with local pollinators.
Earlier this week, yet another bumble bee book landed in my mailbox: the new identification guide Bumble Bees of North America by Paul Williams, Robbin Thorp, Leif Richardson, and Sheila Colla. And while I’ve only just begun to read through the front matter, and flip through the individual species accounts, this surely will be another great asset to anyone working with bumble bees in North America.
So, if you’re still wondering what you can do for bumble bees, I’d recommend digging into any of the books mentioned here during the few weeks left of winter. Then do some gardening, add some native plants that will provide native bees with needed nectar and pollen to your property. If you want to do more, throw some support to The Xerces Society or other organizations conserving needed habitat and start telling others about ways to support native pollinators.
“Chancing to take a memorable walk by moonlight some years ago, I resolved to take more such walks, and make acquaintance with another side of Nature.” – Henry David Thoreau
The mothing began without intention, the frontdoor light left on by chance. Going out well after dark with the dog, I noticed several moths on the side of the house near the light and had the wherewithal to capture several of them. Thereafter, following this serendipitous beginning, the light was left on deliberately, becoming something of a nightly ritual throughout the autumn months.
Not long after the mothing commenced, I purchased a copy of Discovering Moths: Nighttime Jewels in Your Own Backyard by John Himmelman. I enjoyed this book immensely, reading it cover-to-cover in a matter of days. Himmelmann does a really great job of passing along his enthusiasm for moths. The line drawings, the mini-biographies of Lepidopterists and other mothing folk, the seasonal presentation of the mothing year, and the color plates provided the thorough introduction to this group of insects that I needed. And it was in this book, in its discussion of mothing equipment, that I came upon the suggestion of using a bug-zapper as a mothing light.
Now, the bug zapper is truly a repugnant invention. The one and only insect pest it purports to annihilate, the mosquito, is not attracted to light. What smokes and settles in a heap beneath the powered-up machine is a wide variety of beneficial insects, non-biting midges and moths making up a large percentage of the kills. The fact that they are marketed nowadays with chemical lures to attract mosquitoes I take to be an admission of their ineffectualness. In my opinion, bug zappers should be banned and taken off the market. A consequence of their ineffectualness, however, is that used ones are available very cheap. And, using a few simple tools and some electrical tape, the high-voltage grid can be disarmed and the remaining UV light repurposed as a moth light.
This new set up, the now-benign bug zapper hung at the top of our white garage door, provided a marked increase in the attendance of moths. Once or twice a week, if the weather cooperated, I’d set up the light, turn it on, and wait. I’d go out at dusk and then a number of times after that, eventually turning the light off at some point well after midnight to let the moths go about their business…and not rouse too much curiosity about my behavior among our neighbors.
My daughter took to helping me (any excuse to stay up late…right!) and became very adept at catching the moths. Most of the moths were small and could be captured in vials. After capture, the moths went into the refrigerator for the night. In the morning, once the sun was up, they were photographed and released. Usually, the refrigerated moths would sit for some time while they warmed up, allowing me to take dozens of photos. The smaller the moth the less time you have—the ratio of surface area to body volume playing a part in how fast they warmed. The micro moths flew almost as soon as I popped the top on the plastic vial, so I don’t have many successful photos of these tiny moths. My daughter also enjoys all the curious names that moths have been given, as do I. Here’s a sampling: The Wedgeling, The Asteroid, The Deceptive Snout, The Ambiguous Moth, Blurry Chocolate Angle, Hitched Arches, The White Speck.
Our shiny Peterson Guide to moths, purchased in 2012 and barely used, was finally getting some use. At first, with little knowledge whatsoever about moths, the number and variety was simply bewildering. It had taken me several years to get familiar with the hundred or so local dragonflies, the local moths, on the other hand, numbered in the thousands! Himmelman’s book provided an in. And two online resources, bugguide.net and the moth photographers website, provided the added information and assistance needed to begin making identifications of some of the moths. A look at all the moths captured (nearly 250 photos) can be had by visiting my Flickr site and looking at the moth set. Many remain unidentified, and many have question marks appended to tentative identifications, so please feel free to leave corrections or identification suggestions.
A third excellent online resource is the Butterflies and Moths of North America website (BAMONA). The BAMONA website checklist for Rice County lists (at the time of this post) only eleven species. Over a period of three months, late in the year, missing the spring species and many of the summer species, I collected and photographed well over seventy different kinds of moths just in our driveway. Eventually, as time permits, I’ll submit my sightings to BAMONA. That there is a long way to go in documenting the moths of Rice County can be demonstrated by looking at the numbers of species for a better surveyed county. For instance, Wright County, northwest of Rice County, has 280 species on its list.
So, with more work to do and more discoveries to make, I’m looking forward to spring, and the commencement of a new mothing season. I’m also hoping to graduate to the more traditional white sheet this spring. And, if time permits, maybe try some other locations around the state. Who knows, I might even organize a mothing event for National Moth Week, July 19 – 27, 2014. Yes, there’s a national moth week…how cool is that!
Resources & Links
David Beadle & Seabrooke Leckie. Peterson Field Guide to Moths of Northeastern North America. Houghton Mifflin Harcourt. 2012.
John Himmelman. Discovering Moths: Nighttime Jewels in Your Own Backyard. Down East Books. 2002.
The object left deliberately undefined in the previous post is a trap nest, a small stick of wood with a pre-drilled hole designed for collecting wasps, especially potter wasps, hence the mudded up circle in the center. This particular nest was retrieved in November from the gaps in the cement blocks beneath our rain barrel. Last June, happening across several empty nests in the garage, I set the traps: two under cross braces on the garden fence, another beneath the rain barrel. Throughout the summer, whenever it occurred to look at them, they remained unused. That was ok…for I was preoccupied with other entomological endeavors, such as rearing bumblebees (not a success), journeying to Saskatchewan, or surveying local dragonfly populations. Mostly, while in the field on dragonfly business or busy in the backyard, I kept at my incidental collecting of adult wasps from flowerheads throughout the summer, a sideline occupation. Nevertheless, this non-methodical approach yielded a surprising variety of wasps.
In August, I ordered several redwood Schmitt boxes from the Bohart Entomology Museum at the University of California, Davis. These vintage insect boxes would be perfect for housing my small collection until it can be transferred to a curated collection at one of the local colleges. Before placing this order I browsed the used and antiquarian books the museum was offering for sale as a fundraiser. One caught my eye: Trap Nesting Wasps and Bees: Life Histories, Nests, and Associates by Karl V. Krombein (Smithsonian Press,1967).
In this book, Krombein (1912 – 2005) documents the contents of over 3,400 trap nests. It is certainly a classic of the study of Hymenoptera and I was lucky to find a copy. The arrival of this book and the storage boxes in the mail instantly rekindled my interest in trap nests. I set about preparing a number of new nests but almost simultaneously the weather turned cold and the season was over. So I’d have to wait until next summer. Read and wait.
I revisited the pages in Wasp Farm where Howard Ensign Evans discusses trap nesting. When I read this account some years ago, I followed the simple instructions and prepared a handful nests for my own use. These went unused for several years. I remember a couple of them sitting upright on a bookshelf, functioning as rustic vases, holding sprigs of bittersweet and a dried thistle flower. Then, during the summer of 2012, I finally got around to setting them out in a variety of places in the back yard, successfully collecting wasps from two of the nests.
While I have the specimens from the two nests, I didn’t gather all the data I might have. One nest was presplit, but when I opened it the larvae tumbled out and the information regarding their order in the nest was lost. These larvae were placed in vials where they pupated and, some weeks later, emerged as adults. Nor did I take note of the structure of the nest. And while the second nest was left intact for later examination, the examination never happened because the wasps emerged while in storage. The wasps in both nests, after graduating from translucent white larvae to opaque winged adults, were identified as Ancistrocerus antilope, a common, black-and-yellow potter wasp. There was, however, a single, bright metallic-blue exception…a cuckoo wasp (Chrysididae). This resplendent intruder, a kleptoparasite of cavity nesting wasps, had grown from a stealthily deposited egg, usurping one of the potter wasp’s cells and its provisions. The presence of both of these species in our backyard was surprising, for I’d never noticed either of them before.
Now, a little over a year later, I found my third occupied trap nest. It had been weeks since I’d seen a dragonfly and wasps were nearly the last thing on my mind when I happened upon the forgotten trap nest left in the blocks beneath the rain barrel. Finding it there and finding it occupied was a real treat, perhaps the year’s final entomological bonne trouvaille. Facing the cold winter months, the nest seemed a promise of the summer to follow.
Determined to document the contents of this nest properly (or at least better than the previous two), I consulted the methods section of Krombien’s book. When he retrieved nests from the field, he opened them, recorded the contents and structure of the nests, then closed them up again for overwintering and rearing. The wasps need to be reared to adults in order to be identified to species. Simple enough, right?
Well, the block of wood used for this particular trap nest contained a knot and splitting it turned out to be rather nerve-wracking, involving the violent touch of hammer and chisel. But eventually the grain grave up its grip and split, right along the bore-hole as planned, leaving the contents visible and intact. I took a quick photograph alongside a ruler for the records. Looking at the cells…the first cell had no larva, and appeared to be still filled with provisions. Perhaps the egg didn’t hatch or the larva had died. A closer look at the contents revealed a rather interesting drama within the already interesting drama of the nest itself. Details forthcoming in the next post…
Evans, H. E. 1963. Wasp Farm. New York: Natural History Press, Doubleday.
Krombein, K.V. 1967. Trap-nesting wasps and bees: life histories, nests, and associates. Smithsonian Press, Washington D.C. vi + 570 pp.