Year: 2010 (Page 30 of 70)

Seed of the Week: Ash Trees

When I found these keys/seeds, technically samaras, I had no idea what current events they represent.

ash-samaras

The samaras are from an ash tree.

ash-tree

Several different species of ash trees grow in Arizona, all in the genus Fraxinus.

ash-bark

Ash trees are prized for their wood. In fact, ash wood is used for baseball bats.

ash-tree-leaf-1

Ash tree leaves are pinnate compound, which means they are made up of leaflets.

ash-tree-leaves-1

The leaves themselves are opposite each other, forming a V-shape with the main branch.

If you aren’t sure whether you have an ash tree, try this Ash Identification page.

The reason ash trees are in the news is because in certain regions they are being attacked by an insect. The emerald ash borer arrived in Michigan in 2002 and has been spreading and killing trees ever since.

ash-tree-borer

(Photograph Pennsylvania Department of Conservation and Natural Resources – Forestry Archive, Bugwood.org found at Forestry Images)

Although the adult beetles are lovely, the larvae or grubs feeding on the trees under the bark is fatal to the tree. People are concerned that the ash trees will experience a similar devastation as occurred with the chestnut trees and elm trees in the past. In fact there is now a great effort being put into saving seeds of the remaining ash trees in the regions effected.

The emerald ash tree borer website has more information about the beetle and its spread. The main thing they are asking people to do is not to move ash tree firewood from place to place, as that moves the beetle larvae that live inside the wood.

We are going to plant some of the ash samaras we found. Sounds like ash trees could use all the help they can get.

What kind of ash trees grow where you live?

Weekend Science Fun: Virtual Walks in the Woods

Did you ever wish you could take your children on a walk in the woods, but for whatever reason it was not possible? Here in Arizona when the temperature exceeds 115°F, we start looking for alternatives to a hike outside. Here are a few places for fun and educational virtual hikes. If nothing else these sites can give you ideas for things to do during actual walks.

Designed with children in mind:

The Smithsonian National Zoo has “A Walk in the Forest” with six different animated walks. One allows you to take soil samples and measure soil pH. Another helps you learn how to identify trees using keys. Each is led by an animation of a real employee of the zoo. How cool is that!

University of Illinois Extension has a virtual walk in the woods and Secret life of trees. Both show photographs of actual forests. There’s a teacher’s guide with ideas, resources and many extras.

For children or adults:

Ever wanted to visit a redwood forest? Muir Woods has a virtual tour. There are 92 photographs, and you get to choose where you look next. The virtual tour always has good weather.

Florida Hikes has slide shows from various Florida parks.Check out the giant snails at Pine Land. Isn’t fun to see how different the landscape is at the different parks?

Finally, YouTube has a number of videos of walks. I like this one because the tour guide discusses, what else, science!

Hope you enjoy these virtual walks in the woods, and can talk your own walk soon.

Where’s your favorite place for a hike?

Bug of the Week: Feather-legged Orb Weaver

The fun thing about Bug of the Week is that sometimes you spot a critter that has been there all along, you just haven’t paid attention to it before. Today’s spider is an example of this. Here’s a little spider that has built a web in the corner and is hanging from it.

spider1

It is a tiny little spider, it’s body is less than 1/3 of an inch long. I have seen these spiders many times before with their long front legs stretched out in front, but they are so small, I never really looked at them carefully.

spider2

In a closer view you can see the front legs have a soft, feathery appearance, which led to the common name of feather-legged orb weaver. They are also called cribellate orb weavers.

spider3

It’s amazing when you look at a macro photograph how the color and details pop out.

I learned from Nature at Close Range that the cribellate orb weavers have no venom, but catch their prey in the hairy front legs.

Now that I have been formally introduced to my fuzzy little neighbor, I’ll be sure to pay more attention to it in the future.

If you or your children are interested in learning more about your spider neighbors, try:

I have more information about these books at baby spiders and some books.

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