Saturday, March 19, 2016

When is an Oak Tree an Evergreen?

When it's a live oak!

One of my absolute favorite trees is the southern live oak (Quercus virginiana). They range from Virginia to Texas, mostly along the coast as they like moist sandy soil and flooding. I love them because they are huge, gnarly, excellent climbing trees that are green all through the winter.

Don't you just NEED to climb it? This is "The Big Tree" in Texas, about 500 years old and not even the oldest one!
Yes, they are an oak species (Quercus is the same genus as the bur and white oaks in the Midwest) that keeps its leaves all winter! It's wonderful! It makes all winter seem like early spring to someone who is used to snow and everything looking dead. The crazy part, though, is that they lose their leaves in the spring and grow new ones basically immediately, which means that springtime in Charleston (and anywhere else there are a lot of live oaks) looks like this:


But then also like this:


The live oaks do a neat trick of growing new leaves as the old ones fall so they never really look barren and dead even when dead leaves are strewn around their roots in huge piles. New leaves look like this:

You might recognize that as "not what oak leaves look like". They usually look like this:
http://justpict.com/image-white-oak-leaf.html
Live oak leaves are thick, leathery, waxy, unlobed, and much smaller than species like white and bur oaks. The thick waxiness helps them withstand salt spray in their coastal range. I couldn't find anything in my research as to why their leaves are shaped so differently (I looked). My best guess is that the adaptation helps them survive in the high winds of the coast. They are extremely sturdy and durable trees and in many areas are constantly windblown. I think large, thin, lobed leaves like other oaks would blow off, killing the tree even though it is strong enough to withstand it.


And they are extremely strong. They live for hundreds and hundreds of years in incredibly harsh conditions - windblown, salt-sprayed, surviving hurricanes and floods. They grow fast and they grow heavy and tough. Before they were largely ornamental shade trees, they were used for shipbuilding. In fact, the USS Constitution, nicknamed "Old Ironsides" was actually made of live oak. For context, it was launched in 1797, survived several battles at sea during the war of 1812, was active for nearly 100 years, and still sails - the oldest warship still afloat.

http://newenglandboating.com/
Whooops I digressed from Natural History Nerd to just plain History Nerd. Sorry about that! Anyway, the point is: live oak trees are the greatest. They are beautiful and wonderful and they live so long that they've collapsed spring and fall into the same season. There is basically nowhere better to be than up a live oak tree.

Saturday, November 7, 2015

YOLO (You Obviously Love Owls)

Welcome to my new nature blog!

I'm not sure if you're aware of this, but I love owls. I mean, I just had one permanently etched into my skin, so...yeah, I'm pretty committed at this point.

"But, Karis!" I hear you all cry in unison, "How do you possibly remember what all the different owls sound like?"

WELL, I'M GLAD YOU ASKED THAT, INTERNET.

I'm not going to cover all owl species in this one blog post, and - like most animals - owls make a variety of noises and I'm just going to cover the most common ones, but here are some of the most likely responses to "I HEARD A  BIRDLIKE THING AT NIGHT, WHAT WAS IT?!"

Let's start with the one everyone learns first:

Barred owl
Strix varia
Says: Who cooks for you? Who cooks for you aaalll? (Four staccato notes repeated followed by a longer trilled note. Sometimes heard without the long trilled note (the "aaalll" part) but it is still a barred owl!)

The one that is frequently confused with the barred owl:

Great horned owls (the kind of owl that lives on my side)
Bubo virginianus
Says: Who's awake? Me tooooo. (Three staccato notes followed by two long notes)

If you hear an extremely stereotypical owl it is probably:

Long-eared owl
Asio otus
Literally just says "Hoo." I didn't think any of them actually sounded like this, but they totally do.

If you hear a noise that sounds like a tiny tiny horse (and you are East of the Mississippi) it is probably:

Eastern screech-owl
Megascops asio
These guys make a lot of noises but the most common/cutest is called the "whinny". Seriously. A tiny tiny horse. They also trill a lot. They're adorable.

If you are West of the Mississippi and you hear something that sounds like a bouncy-ball dropping with increasing frequency it is probably:

Western screech-owl
Megascops kennicottii
They don't really sound anything like the eastern screech-owl. Bouncy-ball increasing in frequency is really the best way I can describe it.

If you hear something that sounds like A NIGHTMARE TERROR BEAST it is probably:

Barn owl
Tyto alba
Seriously. Like nightmares and/or murder victims.

And that's owl for now! I will probably do another installment with more owl noises in the future. Let me know what you think of my new blog and if there is anything you particularly want to learn about and I will see what I can do.

Also, title stolen from Jeph Jacques. You can totally buy a shirt that says it here.