Page 416 of 562

Bug of the Week: Orb Spider

We have some new spiders in our yard. Even if you don’t like spiders, you should bear with me on this one, because it is so cool.

First, the spider has a typical orb web, shaped rather like a plate.

See that yellowish blob on the upper right? That is also part of this spider’s web, about two or three inches behind the orb.

Here’s a shot from the side. See the bridge of webbing from the orb to the place where the spider sits?

That pile of debris has a fancy name. It is called a stabilimentum. Early investigators named it that because they thought is was part of the support structure of the web, a web “stabilizer.”

In this closer view, you can see the bridge and stabilimentum more clearly. The yellow cotton parts are acacia flowers from a nearby tree. (This web is in a desert willow).

While taking photos of the orb web, a mosquito flew into the web. The spider was there in no time flat.

It quickly pulled the mosquito out of the web. It must have subdued the mosquito somehow, but the action was too quick for me to see what happened.

The spider took the mosquito back to the stabilimentum immediately and hung it amongst the other debris.

How did the spider get back and forth so quickly? Take a close look at the web and see if you can guess.

Okay, now some of you sharp-eyed folks might have noticed something else about the stabilimentum from the photographs above.

From another angle, you can see the “main” spider is still at the bottom, but there’s a second, smaller spider sitting behind and to the rear.

Any ideas why it is there?

In any case, I don’t know what kind of spider this is, although my best guess is Cyclosa or a near relative. Can anyone help me out?

Seed of the Week: Carrot

Did you guess what the mystery seeds were last week? Here’s a hint:

Yes, those spiky-looking seeds will grow into carrots.

The carrot, Daucus carota, is a biennial. That means in the first year it stores up food in its extra large root. If you leave the root in the ground and conditions are right, at the end of the second season the plant will flower and produce seeds.

This is a bud.

Starting to open…

almost there…

flowering!

Along come the little bees to pollinate the flowers. Don’t the flower clusters look like miniature bouquets?

And then you have seeds. Why do you think the seeds have those spines on them?

If you would like to learn more about carrots, the World Carrot Museum has an entire page of excellent experiments and activities to do with carrots for kids, plus oodles of information about the history and uses of carrots.

One fun activity to do with carrots from the grocery store is to take the tops (that you cut off anyway when you eat them) and set them cut end down in a small dish of pebbles. (See the photograph above). Cover half way with water, allowing the green part to be exposed to the air. Keep the bottom covered with water and the cut tops should start to sprout.

Make this into an experiment by comparing the ability of the tops to sprout to the ability of sections further down the root. Will a “baby carrot” sprout?

This fun post is thanks to my son, who asked the simple question:  Can you grow a carrot plant by planting a carrot root you buy in the store? The answer is:  as long as there’s some green at the top of the carrot, it will grow into a plant that produces seeds (if grown during the correct season for your climate). The root is no longer edible, but you can try planting the seeds next year.

Have you ever had a carrot plant go to seed?

« Older posts Newer posts »