The Prairie Ecologist Article: Thank Goodness for Boxelder Bugs

By Chris Helzer The Prairie Ecologist

I finally broke down and bought a close-up flash system for my camera.  Until now, I’ve just relied on natural light to illuminate the flowers, insects, and prairies I photograph.  However, during the last couple years, I’ve been weakening, and looking at recent images from people like Clay Bolt and Piotr Naskrecki finally pushed me over the edge.  After considerable wandering about in the world of internet photography websites and equipment reviews, I am now the owner of a Nikon R1 Wireless Close-up Speedlight Kit. (Say THAT five times fast!)

Here’s my next problem:  Now that I’ve got a flash system to help me get better close-up insect photos, where am I supposed to find an insect to photograph during the middle of February in Nebraska??

Enter the friendly neighborhood boxelder bug…

A boxelder bug captured on my front porch and photographed in my kitchen.

I’m sure I’m not the only one who has been seeing boxelder bugs around their house this winter.  It seems there are always a couple of them nearby - soaking up some sun by the window or reading over my shoulder at by the desk.  Sure enough, as soon as I got the new flash assembly hooked up and ready to test, I was able to find one boxelder bug in the kitchen and another out on the front porch.  (You can tell which is which in the photos because the bug from outside is covered in dust.)

The other boxelder bug – less dusty – that I found in my kitchen.

Boxelder bugs are considered by many people to be pests, but that’s not a completely fair characterization.  Sure, they suck the juices out of leaves and the developing seeds of boxelder and maple trees, but they don’t siphon enough out to actually hurt the trees.  Yes, they can congregate in large numbers on the sunny sides of houses, but they’re not doing any actual damage there.  Also, while they are happy to spend the winter in cozy crevices around your house, they don’t eat anything during that time, and can make themselves available on short notice should you have the urge to try some wintertime insect photography in your kitchen.

As the photo shoot went on, the boxelder bugs and I got more creative in our portrait compositions.  (Also, this one didn’t want to hold still.)

The species of boxelder bug in my neighborhood is the Eastern Boxelder Bug (Boisea trivittata), which is found throughout most of the United States east of the Rocky Mountains, as well as in some western states, parts of southern Canada, and even Central America.  Boxelder bugs are “true bugs”, meaning they are members of the taxonomic order Hemiptera, along with other bugs such as stink bugs, plant bugs, cicadas, and many other insects that have piercing/sucking mouth parts.  Like many other true bugs, boxelder bugs also have a characteristic triangle between the tops of their wings (as opposed to beetles, in the order Coloeptera, which have hardened forewings that form a hard shell on their back when they’re not flying.)

They’re even cuter from the front, aren’t they?

One of the endearing qualities of boxelder bugs is that they can release bad-smelling/tasting chemicals to discourage predators.  Like many other insects with similar capabilities (monarch butterflies and long-horned milkweed beetles, for example), they have bright orange or red markings to warn predators off.  That defense mechanism may be why boxelder bugs feel comfortable hanging around – often in large crowds - in plain sight, while most other insects work hard to stay hidden.  

Last shot.  Note the small eyes behind each of the main eyes.  Those smaller eyes are ocelli, or simple eyes, that (we think) can discriminate only between light and dark.  Their function is still a topic of debate among entomologists.

I understand that many of you won’t ever become fans of boxelder bugs.  I guess I can live with that, and – with the exception of those you squish – so can the boxelder bugs.  Personally, I like them.  As with every other insect species I know of, they have an fascinating life story, and they’re just trying to make their way through life like the rest of us.

Plus, they make very accomodating photo subjects in the dead of winter.

Photography notes for those of you who care…  These photos were all taken with the “standard” set-up of the R1 system, with two speedlight flashes, mounted at “9 and 3″ at the front of my Nikon 105mm macro lens.  I had an 8mm extension tube on for all but the second photo shown here.  The bugs were photographed walking around on the white plastic (acrylic?) diffuser that came with the flash system.  All these shots were hand-held at 1/250 sec exposures.  I’m looking forward to using this flash system outside, so I can capture images of insects, flowers, and other small things when the available natural light isn’t quite as good as I might want.  We’ll see how that goes.

Mammals Breath Causes Aphids to Keel Over

By Jennifer Viegas
As appeared in http://www.msnbc.msn.com/id/38630807/ns/technology_and_science-science/

A whiff of danger prompts insects to keel over
Response to mammals’ breath helps aphids avoid being eaten

People may feign falling over backwards after smelling bad breath, but new research shows some insects actually do keel over when they detect warm, humid mammal breath.

It turns out the dramatic instinct, which causes insects living on plants to fall to the ground, is a life-saving strategy that often prevents the bugs from being eaten by potent breath-releasing mammals as they feast on the plant.

The study, published in the latest issue of Current Biology, is the first to show that any kind of defensive behavior exists against incidental predation by herbivores.

"Tiny insects like aphids are not helpless when facing large animals that rapidly consume the plants they live on," said lead author Moshe Inbar of the University of Haifa. "They reliably detect the danger and escape on time."

For the first part of the study, Inbar and his team allowed a goat to feed on potted alfalfa plants infested with aphids. The researchers were amazed to see that 65 percent of the aphids dropped to the ground just seconds before they would have been eaten along with the plant.

"As soon as we started to work on this problem, we suspected that the aphids responded to our own breath," said Inbar, who added that he and his colleagues later wore snorkels to prevent their own breath from affecting the experiment results.

The mass dropping of bugs might have been caused by other factors, however, such as shaking of the plant by the goat while it ate or rubbed against the alfalfa, and shadows produced by the goat's presence. So the researchers invented a special leaf-picking device that shook the plant, without, of course, emitting breath. The aphids didn't keel over.

Shadows also had no effect on the aphids' dropping behavior. Even shadows created by ladybugs, an enemy of aphids, didn't inspire that kind of synchronous response.

The scientists next allowed a restrained lamb to approach aphid infested broad bean seedlings. The breath of the lamb did the trick: aphids dropped off the seedlings left and right.

"It was now obvious that herbivore breath is the key player in conveying to the aphids the message of imminent obliteration," according to the researchers.

To further investigate what qualities in mammal breath cause this bug reaction, the team constructed an artificial breath apparatus that they tested out on the aphids. Carbon dioxide and isolated volatile organic compounds in the produced breath led to no bug response.

When the airstream was warm and humid, however, aphid drop off rates shot up to 87 percent, suggesting that the aphid's sensory system on ambient humidity might be key in their breath detection abilities.

"We predict that this sort of escape behavior in response to mammalian breath may be found among other invertebrates that live on plants and face the same threat," the researchers concluded.

Other insects pay attention to our breath too.

Scientists at the University of California at Riverside, for example, recently did extensive work on how mosquitoes use carbon dioxide, emitted in human breath, to find blood meal targets.

Project leader Anandasankar Ray, an assistant professor in the university's Department of Entomology, and his team hope to foil the mosquitoes by developing repellents that he said will "block mosquitoes' ability to detect carbon dioxide in our breath, thereby dramatically reducing mosquito-human contact."

The aphid work may also pave the way for the development of non-toxic insect repellents.

Copyright © 2010 Discovery Communications, LLC. The leading global real world media and entertainment company.

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Dragonflies

Image via Wikipedia

If you're lucky, dragonflies will join the birds and butterflies in your Backyard Wildlife HabitatTM site this summer. You will enjoy their presence -- especially during cookouts and other outdoor activities -- because they eat those pesky mosquitoes and flies. Dragonflies are attracted to water. Therefore, if you have a birdbath, water garden or pond, you may also have dragonflies.

Dragonflies have roamed the earth for over 300 million years. They have inspired both awe and fear in us with their fierce beauty and fascinating lifecycle. Born underwater to emerge from a life in mud and sand, a dragonfly nymph transforms into "a living flash of light," as Lord Tennyson once described them. The 2,500 different species of dragonflies come in many colors -- blue, green, purple and bronze. Their aerial acrobatics are made possible by powerful wings that generate small tornadoes of air that keep the dragonfly moving at speeds of up to 60 miles an hour.

Like many birds and some butterflies, dragonflies migrate. But unlike other migratory creatures, the phenomenon of dragonfly migration is very much shrouded in mystery. It is the combined flight patterns of millions of dragonflies that have become a mystery to modern researchers. You may have seen a group of dragonflies fly by and wondered with curiosity, "Where are they going?" As yet this remains unanswered, as do many questions. It is not even certain why dragonflies migrate. One day these mysteries may be solved. In the meantime, all we can do is watch them in awe, admire their beauty and thank them for being so helpful around the yard!

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