Surprising spider industry

I have an office spider, Diana, who lives in a display case with a wooden climbing frame and a floor made of left over calcareous sand and shells from my aquarist days. Today I found that she’d seized stuff from the ground, like this:

…lifted them up to her web up high, and build a hemispherical nest, which she was snuggled down inside of. Clever girl.

If you want to see the nest, I put a photo on Patreon (reminder: I have a patreon account I use to try to pay off our legal debt) and also on Instagram.

MORE! MORE SPIDERS! YOU ARE ALL DOOOOMED!

I went off to feed the spiders this morning, and as I was going out the door, Mary asked if I needed any more egg sacs. “I hope not,” I replied, because I’ve got so many baby spiders to tend that I’m not sure what I would do if I had another round of hatchlings. So she cursed me. I found 7 nice new Parasteatoda egg sacs, and 2 new Steatoda triangulosa sacs. I tell you, I’m getting so good at breeding spiders I am currently oscillating between two states.

The only thing that will save me is that I expect, from past experience, that about half the egg sacs will contain only infertile eggs. It’s not my fault, the females are picky, and some of them constantly friendzone* all their suitors. Three of them are definitely from non-virginal, proven breeders, though, so I’m anticipating dealing with about 300 more babies soon.

By the way, I like to regularly remind you all that I have a Patreon, and if you want to see a photo of a hungry baby at the table, sign up!

*“friendzone”, in the native Spider, is synonymous with “murder and eat”. I suspect MRAs/Incels of being native Spider speakers, which has led to all kinds of confusion and erroneous ideas about the human version of the word.

Oy, so much work

Just so you know, this is a terrible week (has there ever been a good one?). I’m doing this big deal faculty seminar at my university tomorrow, which has my anxiety jacked to 100, and I’m giving an exam on Friday, increasing student anxiety, and I have students who have been exposed to COVID and are quarantined, and I haven’t been able to go out spidering as much as I would enjoy. It also didn’t help to have FtB suddenly crash out. Things are happening, though. We’re making real progress on getting the apparatus for some behavioral studies running, and even have a backlog of data piling up from nightly time-lapse runs. Here’s another one.

We’re slowly clearing away bottlenecks. We’re still uploading data as we collect it on our Raspberry Pi to a Google Drive (that was about 2 gigabytes of frames for that video), and then downloading it to our personal computers. One catch is that Mac makes me unhappy again, choking on the download. Linux makes me happy because it has absolutely no problem smoothly downloading data from Google, but then it makes me unhappy because it doesn’t have the sweet easy video tools I want. But then Mac makes me happy because it does, so I just use a flash drive to move the data to my Mac, which can instantly convert everything. So the data is flowing from Raspberry Pi → Google Drive → Linux → Mac, and then to YouTube. It’s nice to see everyone getting along, but if we had a way to bypass one step of that pathway, I’d probably take it. Especially since at some point I might want to have a couple of Raspberry Pis chugging away at observations.

Night moves

Our spiders are very quiet during the day, but we noticed that every morning their cages were full of fresh cobwebs. We knew they were sneaking around at night, and we resolved to catch them at it. A student, Ade Atolani, and I put together a gadget so we could watch.

We got a Raspberry Pi with a NoIR camera, drilled a hole in a plastic cage, and mounted it above a spider. I had no idea if this would work adequately at all — would we have enough resolution to even see the spider? How effective was this camera at seeing in the dark anyway? — so we just slapped together a quick trial run. We turned everything on late one afternoon, told the Raspberry Pi to take a picture every 60 seconds, and let’s see what we get. Miraculously, it all worked, first try.

What you’ll see in the video is a rectangular wooden frame in a cage, and we’re looking down on it. There’s a nice velvety dark cloth on the bottom, to minimize glare and reflections. At the beginning, there’s diffuse light from the window, so the infrared camera isn’t kicking in yet, but when it gets dark enough, the IR lamps automatically switch on, and the purplish black cloth looks pink. The important thing is that we can see the spider all night long, as it goes through bursts of activity. Awesome.

It looks like we’re going to have to sample at a higher rate, because the behavior is very bursty. We’ll enclose the whole set up in a light-proof box to get rid of the extraneous light. I also want to try some side illumination with an IR lamp to see if we can resolve the webbing as it goes up. This was just a pilot experiment, but it’s very promising.

Good morning, babies!

It’s time to get an apartment of your own!

On the left in this vial you can see the egg sac; on the right the black shriveled thing is a mealworm that was consumed by Mom. Mom has been moved out already. All those little black dots everywhere? Baby spiders. I’m going to have to go remove that foam plug now, and quickly sort ’em all out.

Looking for Argiope in West Central Minnesota

Sorry, but I didn’t include the photos here, which are all closeups of great big hairy spiders with bold coloring. The complete illustrated story is on Patreon, and the photos are on two posts on Instagram.

Mary and I went on a little spider hunting loop yesterday, looking for Argiope. We took a southeastern route, heading off to Swift county, then detouring a bit south to clip through Chippewa county, then due east to Kandiyohi, and finally north and back west through Pope county to home. Our strategy was simple: drive through farm country on state and county roads, keeping an eye on the ditches that parallel all roads around here. When we saw lots of grass and brush filling the ditch, and when there was a safe place to pull over in the car, we’d stop and stroll about, looking for webs.

We really needed an “I Brake for Spiders” bumper sticker, because we were probably annoyingly slow. Good thing the roads were nearly empty!

One catch to this approach is that good grassy roadsides were scarce. Apparently, good Republican farmers have little to do and lots of tractors, so they trim everything. Have you ever seen a drainage ditch that looks like a manicured lawn? We did, everywhere. The best places had 1-2 meters of grass, where we’d walk in and be in the weeds to chest height or over our head. Actually, the best places were nature preserves and restored prairie.

We persevered, though, and found Argiope in every county we visited. They’re common, but they really don’t seem to like the kind of place where big bipedal mammals frequently bumble around. Living near people is OK, but they better not ever come over to visit.
So here’s one from Swift county:

Classic Argiope aurantia. Big, black and yellow, and a meter wide orb web with stabilimentum zig-sagging down the center.
Chippewa county is the emptiest place we visited, lacking any large towns and consisting of nothing but farms. They do have Argiope aurantia, though.

Kandiyohi county is kind of the inverse. It does contain one big town, Willmar, which was right in the way of our route, and Argiope does not like cities much. We finally found one as we were driving away by our usual expedient of pulling into farm access roads where the residents weren’t overzealous lawn fanatics.

We’d actually planned to hit up a couple more counties, but the weather turned grim, all gray and rainy. Even as I write this I’m listening to thunder. We’d decided to skip a northern loop of our drive and go home through Pope county, where we found Argiope trifasciata in a nature preserve.

One cool thing about this one is that there were two other webs in the same little patch, only a few centimeters away, and they were occupied by males, hopeful consorts I would guess.

We’re going to do it again next weekend, aiming for a western and northern loop, passing through Big Stone, Traverse, and Grant counties. Also on our list is another trip to the Ecostation in Ottertail county.

My mission for the day

I have received a mission request from iNaturalist. I have chosen to accept it. It did not self-destruct after I read it.

Records of Argiope aurantia (Yellow Garden Spider) and Argiope trifasciata (Banded Garden Spider) for 2020 started getting posted a couple of weeks ago. These two species are some of the most photographed spiders in Minnesota thanks to the female spider’s habit of sitting in her web in sunny locations like prairies and gardens. These species are easy to distinguish from one another and no other orb weavers match either their size or bold patterns.

Last fall the members of this project joined forces to find 13 new county records for Argiope aurantia and 12 new county records for Argiope trifasciata. But we still haven’t recorded these species in every county in Minnesota so I’m throwing down the gauntlet once again! Can we make these two species the first two spiders known from every one of Minnesota’s 87 counties?

The following 35 34 counties have no records of Argiope aurantia:
Aitkin, Beltrami, Big Stone, Carlton, Cass, Clearwater, Cook, Crow Wing, Grant, Houston, Hubbard, Itasca, Kanabec, Kittson, Koochiching, Lake, Lake of the Woods, Mahnomen, Marshall, Meeker, Mower, Murray, Nobles, Otter Tail, Pennington, Pine, Polk, Pope, Red Lake, Redwood, Roseau, St. Louis, Swift, Traverse, Wadena

The following 34 counties have no records of Argiope trifasciata:
Aitkin, Benton, Big Stone, Cass, Clearwater, Cook, Dodge, Fillmore, Freeborn, Goodhue, Hubbard, Itasca, Kanabec, Kandiyohi, Koochiching, Lake of the Woods, Mahnomen, Marshall, Martin, McLeod, Mille Lacs, Morrison, Murray, Norman, Pennington, Pope, Red Lake, Roseau, Sibley, Steele, Swift, Todd, Wadena, Wilkin

I’ll update this post as new county records get established. Happy spidering! (yeah, that’s a thing!)

You know what this means — ROAD TRIP! I noticed that West Central Minnesota counties are largely represented on the list. In my region, only Stevens (where UMM is), Douglas (where the larger city of Alexandria is), and Stearns (St Cloud) have had records for these species. Mary and I figure we can hit up 3 or 4 neighboring counties and make a small dent in that list today, and get out and explore at the same time. We might also squeeze in our local grocery run and have a picnic. We can’t lose!

We made a trial run last night, just here in Stevens county. We found lots of Argiope just in the grassy ditches that run alongside the highways around here, so this ought to be easy. If any of my fellow Minnesotans in more distant counties want to join in, please do.

If you don’t know what these spectacular spiders look like, I posted some photos on Patreon and Instagram.