awild | February 28, 2010A short clip from the BBC program "Ant Attack"
Driver ant males are astoundingly strange creatures. They are larger, more muscular, more exaggerated than most other male ants. The reason is likely linked to the behavior shown in the above video: males must first be accepted by a gauntlet of choosy workers.
A classic paper by Franks and Hoelldobler (1987) describes the theory. This preference of workers for bulkier males- and a corresponding slaughter of smaller or otherwise unsuitable ones- drives an evolutionary trajectory towards increasing monstrosity. It's an ant version of the peacock's…
awild | February 26, 2010Bob Goldstein at UNC has been making some truly divine posters to advertise the talks of scientists visiting the Biology department. They are awesome.
awild | February 25, 2010Speaking of bug horror movies:
If you can make it to Champaign-Urbana this weekend, the 2010 Insect Fear Film Festival will feature The Black Scorpion (1957) and Ice Crawlers (2003). The grad students are assembling art displays, face painting, and an impressively large arthropod petting zoo. The've even shipped in live horseshoe crabs, as well as bess beetles, tarantulas, ginormous grasshoppers & cockroaches, and others. It's tremendous fun.
awild | February 25, 2010The Great Ant Escape
Incidentally, what's up with the obvious photoshop job in the accompanying image? It looks like a chorus line.
*update* - it seems they've swapped the image out for a more sensible one. The original is here.
awild | February 24, 2010
Acyrthociphon pisum, the Pea Aphid
The genome sequence of the pea aphid Acyrthosiphon pisum was published today in PLoS. Concurrently, a set of supporting papers has come out in Insect Molecular Biology. This genome is significant for a number of reasons- it's the first Hemipteran genome to be sequenced, aphids have an unusual reproductive cycle, and this particular species is a serious agricultural pest.
I've not had time to fully digest the paper, but it seems the salient features of this genome are:
extensive gene duplications
a higher gene count than most other known genomes (including…
awild | February 23, 2010...at the scope.
Photo details: Tamron SP 11-18mm 4.5 on a Canon EOS 50D
ISO 800, f4.5, 1/50 sec
awild | February 23, 2010A video from Cambridge University highlights an infectiously enthusiastic Chris Clemente as he figures out how ants stick to smooth surfaces:
Wow.
Two things strike me about the video. First, they simplified the science for a lay audience without fundamentally changing it. That's something of a rarity, as any scientist who has seen their work covered in the media can attest. Second, they did this while retaining a sense of humor and the strong sense of humanity in the scientific process.
Most scientists I know have a similarly intense fascination with their subjects- that's a rich vein for…
awild | February 22, 2010
Zootermopsis soldier termite, jaws at the ready.
If you think of termites as pasty white squishy things, here's one that'll jar your preconceptions. Zootermopsis dampwood termites of western North America have large soldiers- over a centimeter long- that are muscular and well armored.
Soldiers are deployed not against predators but against other termites, as colonies within a single rotting log fight when they encounter each other. Those jaws are ideal for slicing through an enemy queen, for example, or for protecting their own.
Photo details: Canon mp-e 65mm 1-5x macro lens on a Canon EOS…
awild | February 21, 2010As winter doesn't have much insect activity, it's the season I use to work on my equipment. Yesterday I tried out a new arrangement to diffuse the heads on my mt-24ex twin flash when the heads are mounted on long, moveable arms. Here's a time-lapse video showing the construction, plus a short clip of the gear in use:
Note the effect of the diffusion:
A bare, undiffused flash produces harsh shadows and glare
A diffused flash provides softer, more even lighting
awild | February 19, 2010
Ostoma pippingskoeldi, Sierra Nevada, California
If you peel back the bark of an old stump in the forests of western North America, there's a good chance you'll find some of these attractive tank-like insects. This is Ostoma pippingskoeldi, a predatory beetle in the family Trogossitidae. They lurk about under bark searching for soft-bodied prey, including the larvae of other beetles.
All legs and antennae tucked safely away.
Photo details (top): Canon mp-e 65mm 1-5x macro lens on a Canon EOS D60
ISO 100, f13, 1/200 sec, diffused flash
(bottom): Nikon coolpix 995, ambient light
awild | February 18, 2010
The inaugural blog carnival celebrating the Beetles is now online- go see!
awild | February 17, 2010
Timema sp. stick insect, California
I've created a new gallery to hold my photographs of stick insects. Check it out here:
Stick Insect Photos
awild | February 16, 2010I am impressed. Several of you* figured out the mystery behavior: reflex bleeding, a defensive response employed by some arthropods with especially nasty hemolymph to deter predators. A couple of you even pegged the identity of the mystery arthropod, a blister beetle in the genus Epicauta. Here's the uncropped photo:
An Epicauta blister beetle reflex bleeds when grasped with forceps.
Five points each to Tim, Ainsley, Neil, and Dave. And, ten points each to Pete and TGIQ.
So. Um. Don't spend them all in one place...
Posing on a mesquite flower.
*what's up with all the guessers-of-mysteries…
awild | February 16, 2010The online early section of Molecular Phylogenetics and Evolution this week has the first comprehensive phylogeny of a rather important genus of ants: Myrmica.
Myrmica is ubiquitous in the colder climates of North America and Eurasia, with a few seemingly incongruous species inhabiting the mountains of tropical southeast Asia. The genus contains about 200 species, many that are common soil-nesting ants in lawns and gardens, and at least one damaging invasive species, M. rubra. The taxonomy ranks among the most difficult of any ant genus, as workers of different species tend to be numbingly…
awild | February 15, 2010What's going on here?
Five points for naming the organism, and five points for the behavior.
awild | February 15, 2010
We here at Myrmecos Blog don't care to voice our opinion of talk show host Glenn Beck. But we are rather enamored of dung beetles, those gorgeously ornamented insects who prevent the world from being buried in feces.
Thus, we were pleased to find the following Facebook project in our inbox this weekend:
Can This Dung Beetle Get More Fans Than Glenn Beck?
If you're on facebook, and you like dung beetles, now's your chance to become a fan.
h/t Jesse.
awild | February 12, 2010
Tapinoma sessile, the odorous house ant, with larvae
Last summer I replaced the old covering on our porch roof. When I peeled back the rotting shingles, I was greeted by a frenzy of frenetic brown ants- thousands of them- running about every which way. Dozens of fat queens scurried for cover. It was an impressive display of formicid infestation, reminiscent of the swarms of invasive Argentine ants in California.
But these weren't exotic pests. This was a native species, Tapinoma sessile, whose pleasant blue-cheese odor lends it the name "odorous house ant".
Tapinoma sessile is found…