Broodmother

Steatoda triangulosa, hovering watchfully over her egg sac.

We also set up 8 Parasteatoda tepidariorum with mates today. For the most part, all went well, with the males approaching tentatively and plucking at the female’s web, as they should. One female went berserk when we added a male, chasing him all over the cage while he frantically scurried away. We were concerned that we ought to split them up, but they’d reached a cautious détente after about 20 minutes, so maybe their relationship will work out.

We’ll know in a week or two if we see more egg sacs.

The Spider Times

I’m trying to keep my spider-squad informed about plans for the lab, so I’ll be periodically sending out notifications to them. I figured maybe other people might be interested in the goings-on, at least those of you who aren’t currently horrified at my arachnological obsession of late.

Hey, spider-people! I bring you news.

1. Two weeks ago, we set up new cages for the female Parasteatoda in the colony: spacious, clean, with cardboard frames to clamber on. The spiders seem very happy, and have been busy filling the frames with cobwebs.

2. Last week, I was away at an arachnology conference that extended longer than expected, because of terrible airline delays. When I got back on Sunday, I fed everyone. They were hungry. All the spiders dived for the flies with impressive speed and were munching away ferociously.

3. I’m planning on regular feeding times every Monday and Thursday at noon — but not today, since I fed them yesterday. Feel free to stop by to watch the spectacle!

4. Today is a special day for another reason. After giving the females a week to construct webs in their new housing, today at noon is the day we’re going to introduce males into their chambers. We’re hoping the roomier quarters means they won’t immediately eat their mates. Come on by for the nuptials!

5. I’m planning the next phase of the Stevens County spider survey. We’re going to start on 8 July, and we have over 30 houses to visit. We’ll have the goal of doing 6 houses per day, with each house taking half an hour or so to screen. Let me know if you want to participate.

6. The new Spider-Man movie also comes out the week of 4 July. Anyone want to join me some evening that week? My treat, we just have to work out a good day. (Alternatively, Spider-Man: Into the Spiderverse is on Netflix, starting in a few days…we could take over one of the classrooms and project it there.)

7. In other news, I’ve been posting photos of the spiders we meet to iNaturalist, in the Spiders of Minnesota project. We have the honor of the first recorded observation of Pholcus manueli in Stevens county! It was caught right here in the Science Atrium. It’s a good thing we caught it, too, because our diligent custodians eradicate any spider web they encounter.

8. You all saw the article in the Stevens County Times, right?

9. We have an egg sac that’s over a week old in the incubator, laid by Steatoda triangulosa, which isn’t the species I was planning to work on, but I’ll take anything now. The egg case is gauzy and semi-transparent, and you can see the embryos right through it. It could hatch out any day now, giving us a swarm of spiderlings.

So, things to look forward to:

  • Regular spider feedings at noon on Monday and Thursday
  • Mass wedding of a dozen spiders today at noon
  • Spider survey resumes on 8 July
  • Possible S. triangulosa spiderling hatch any day now

Someday, when I’m a real boy, I’ll be better at photography

Mary, again…she was out in the garage, and spotted a pair of P. tep. getting frisky. The male kept approaching the female and waving his forelegs for attention, and Mary told me I should capture some of the action (she’s an amateur pornographer, too? She can do everything). Of course I rushed out to set up a tripod and my biggest lens to see if I could get some real wildlife photography. Unfortunately, this was the best I could do.

That’s the lady spider, near the center right; her suitor is the darker, smaller spot to the left. That’s all the oomph my Canon t5i with the EFS 17-85mm lens has. It’s not enough. This is what I’m using to photograph spiders outside the lab.

The big thing hanging off the end is a nice bright LED ring light.

If I want to get any good at this, I know I’m going to have to practice, practice, practice, but I’m also going to need a better lens. Any photography experts out there want to give me some advice? I’ve been eyeing the Tokina at-X 100mm f/2.8 PRO D Macro Lens, or maybe these Macro Lens Extension Tubes which are much more in my price range, although I wouldn’t just stack lenses in my microscope to get a magnified image, so I’m a little leery. I’ve also read that the Canon EF 100mm f/2.8L IS USM Macro Lens is kind of optimal for my purposes, but that’s way out of my price range.

Actually, everything is out of my price range, because I’ve still got that vile SLAPP suit hanging over my head. If that would go away, maybe I’d have a little room in my budget.

But hey, advice and dreams are free, right? Aim me in the right direction.

Mary has been busy, too

In addition to rescuing her stranded man from airports, Mary has been scouting around for spiders in my absence, and caught a few around the house. This is Parasteatoda tepidariorum, the species I work with in the lab, and she has gone straight into the colony.

P.tep is my favorite: so common, but so interesting.

Welcome to the universe, Larry!

Perhaps you recall the majestic Larinioides I found at Pomme de Terre park almost two weeks ago? It laid a large pink egg sac in the container we had it in, as a present before we released it back into the wild.

Today, or perhaps last night, they started hatching. Here’s a baby Larinioides spiderling, freshly emerged, and looking a bit stunned.

They’re back in the incubator until I see that a few more hatch out, and then they’ll be released to the world.

Doctors discover plasticity! Shock horror!

Teenagers are acquiring bone abnormalities from cell phone use! It’s the perfect story, combining contempt for social media and technology and young people with an apparent appropriate comeuppance for those sins.

Mobile technology has transformed the way we live — how we read, work, communicate, shop and date.

But we already know this.

What we have not yet grasped is the way the tiny machines in front of us are remolding our skeletons, possibly altering not just the behaviors we exhibit but the bodies we inhabit.

New research in biomechanics suggests that young people are developing hornlike spikes at the back of their skulls — bone spurs caused by the forward tilt of the head, which shifts weight from the spine to the muscles at the back of the head, causing bone growth in the connecting tendons and ligaments. The weight transfer that causes the buildup can be compared to the way the skin thickens into a callus as a response to pressure or abrasion.

The phenomenon is called an EEOP, or enlarged external occipital protuberance, and in a study of 1200 people, they found that about a third have this feature…and that it is more common in men and younger people. They assume from the differences in frequency at different ages that this is an emerging, recent change, which may be reasonable, but I’d like to see a better analysis of the causes.

The authors also assume that this is an undesirable change, with loaded language and an attempt to imply this feature causes serious problems.

Alarmingly, a survey of university staff and students revealed that participants spend an average of 4.65 hours/day using a hand held mobile device, and that 68% of the participating students reported neck pain.

Why is mobile device use alarming? Also note: they do not show a correlation between the presence of EEOPs and neck pain. We’re simply supposed to assume there’s a causal relationship, I guess, between exostoses and this vaguely defined term, “neck pain”. They have not shown that these bony bumps are a problem, but they are ready to raise the alarm.

Clearly, our findings should raise concern as morbidity and disability due to musculoskeletal disorders impose increasing physical, social and financial burdens on individuals and societies. Accordingly, the mitigation of poor postural habit through prevention intervention may be prudent.

Again, they have not demonstrated morbidity or disability. They’ve found that lots of people have these “bumps” that are easily detectable in x-rays, and maybe it’s because people are peering at their cell phones or playing the video games, so there must be a problem. They’ve only shown that the phenomenon exists!

To which I would point out the example used in the Washington Post article: hard work causes a healthy plastic response by your tissues, building up calluses. Are we alarmed by the growth of calluses in working people? Or do we recognize that this is a normal protective response by our bodies to environmental stresses? If you adopt an unusual posture in your work, your bones, cartilages, and tendons also mold themselves to fit.

They also show that 40% of college-age people are exhibiting this “problem”. I’d say that if it’s that common, while these same people seem to be functioning well and are actively and voluntarily engaging in the activity that putatively causes it, it probably isn’t a problem. It may also become the new normal. When over half the population expresses it, will doctors change their diagnoses and note of the new minority, “Oh, you’re missing your occipital exostosis. I’m going to recommend some physical therapy to build it up”?

Finally, one peculiarity here is that they’re jumping all over this possibly entirely benign phenomenon. Rather than focusing on college students using cell phones, I wonder what musculo-skeletal distortions are affecting people who are doing stoop labor, or other repetitive tasks in their work. Perhaps someone can put together an alarmist paper showing the plastic responses in the bones of menial laborers, expressing concern for the unfortunate spinal problems of those people. After all, if you’re horrified that students spend 5 hours a day looking at their phones, you should be experiencing raging apoplexy about farm workers spending 8-10 hours a day bent over, picking crops.

Nah, those people don’t matter.