Wednesday, June 6, 2012

Honeymooning Hellbenders at the St. Louis Zoo

Last October, when the US Fish and Wildlife Service added the Ozark hellbender to the nation’s list of endangered species, my first question was:


As a resident of the Ozarks, it was a little embarrassing not to know. 

But this creature (one of the world’s largest salamanders) is not the sort of species that attracts a lot of attention. The hellbender is slimy, hulking, drab, and downright strange-looking. Plus, it spends daylight hours hiding under rocks in the depths of swiftly flowing streams. I’ve spent years working and playing in Ozark waters, and I’d never heard of it, much less laid eyes on one.

Photo by Jill Utrup/USFWS
Unfortunately, the harmless Ozark hellbender is now as imperiled as it is elusive, and people are finally paying attention.

Fewer than 600 hellbenders are estimated to exist in a handful of river systems throughout southern Missouri and northern Arkansas. Projects are already underway to protect and restore hellbender habitat in the wild, and scientists are working in earnest to identify and combat other possible causes of population decline.

At the same time, the Saint Louis Zoo has been bent on boosting numbers by hosting an elaborate hellbender honeymoon. The Ron Goellner Center for Hellbender Conservation has created a 32-foot-long replica of a natural Ozark stream.  Inside this “honeymoon suite,” the zoo has successfully established a breeding group of adult hellbenders. So far, 165 baby hellbender have hatched—the first hellbenders to ever be born in captivity—and with them, a new hope for this species’ survival has hatched as well.

Tuesday, June 5, 2012

If You Touch a Toad

You already know that I'm a sucker for jumping spiders, so it probably won't surprise you that toads tickle my fancy too. Again, it's often a matter of misunderstanding when such a charming creature gives people the creeps.

Photo by Jarek Tuszynski / Wikimedia

Let's face it, in this modern age of ecological enlightenment, it's time to ditch the superstition about warts. Not true, never was. But, that's not a green light to grab the nearest toad and give him smooches (admit it, I read your mind).

 "The Frog Prince" image by Marianne Stokes (1855–1927) / Wikimedia

First of all, the salts, oils, and cosmetics on human hands can irritate a toad's tender skin and compromise its health. Not nice. And second, common U.S. toad species have glands behind their eyes that secrete "bufotoxin," a substance designed to make toads taste bad to predators. It's not particularly hazardous to humans, but it can bother your mucous membranes (eyes, nose, mouth). So if you or your little Steve Irwin-in-training touches a toad, wash your hands. 

Photo courtesy of the USFWS

The bottom line: take a minute to get to know a toad. Observe his gently bumbling ways. Who knows, you may just fall in love with the portly little prince. No kissing required.

Curious Classroom Activity:
Create a cool interactive food web for the endangered Houston toad.

 

 


Wednesday, May 30, 2012

Eye Contact

Have you ever taken the opportunity to look a spider in the eyes? 

If the idea creeps you out, bear with me. I'm not suggesting a close encounter with a SCARY spider. Even I find it nearly impossible to appreciate a black widow or brown recluse. Call it poison prejudice. It is what it is.

However, there are certain spider species that are easier to approach, and upon closer inspection, you may even find them endearing. Honestly, I do. 

The arachnids of my affection are the jumping spiders. Often furry, ever active, and undeniably communicative, these little acrobats have a surprising inclination to bridge the language/size/leg number barrier. 

Approach a jumper, and it will likely pause, turn to face you, and, yes, make eye contact.

It's hard not to respect someone who will look you straight in the eye.

Go on, try it. You'll see ...

Photo by coniferconifer / Wikimedia



Saturday, May 19, 2012

Oil Spill Cleanup: Adventures in 4th Grade Science

The 4th grade class at my kids' school was challenged to design a science project that would be practical and locally applicable. My water girl's project earned her a second place ribbon in the Environmental Science category at the regional science fair.



Problem:

What everyday household materials can be used to clean up a small oil spill in a local creek or pond?

Hypothesis:

I think that cotton balls will soak up the oil from the spill the best (they will soak up the most oil).

Materials:
  • 3 clear drinking glasses
  • Water 
  • Vegetable oil  
  • 3 teaspoons cocoa powder
  • Ruler
  • Sharpie marker
  • Spoon for mixing
  • 1/4 cup cotton balls (4 cotton balls cut in half to make 8 pieces)
  • 1/4 cup sponge (cut into 8 pieces)
  • 1/4 cup shredded wheat (8 small squares of cereal)
  • tongs
Procedure:

1.     Fill glasses with cold tap water to 9 cm deep. Mark level on glass with a marker.
2.     Pour vegetable oil into glasses until the level reaches 11 cm deep. Mark level on glass with a marker.
3.     Add 1 teaspoon of cocoa powder to each glass and mix well to imitate crude oil.
4.     Let solution settle for 3 minutes.
5.     Carefully drop 1/4 cup of sorbent (sponge, cotton, shredded wheat) into each glass. Do not submerge.
6.     Let glasses sit for 12 hours.
7.     After 12 hours, use tongs to remove sorbent materials from the glasses.
8.     Measure water level and oil level to see how much oil and/or water was absorbed by each sorbent.

Conclusions:

My hypothesis was not fully supported by the data. Both the cotton and sponge sorbents soaked up the same amount of oil, but the cotton soaked up more water than the sponge. So, in real life, sponges would work better than cotton to clean up an oil spill because cotton would be much heavier to remove from the water. The wheat fell apart and sank to the bottom of the glass (could not be removed), so it would not work at all as a sorbent in real life. 


 

Tuesday, May 15, 2012

How much water is on Earth?

Illustration by Jack Cook, Woods Hole Oceanographic Institution (©) Howard Perlman, USGS


This image from the USGS shows the size of a sphere that would contain all of Earth's water in comparison to the size of the Earth. 

Wow, right?

Double wow when you consider that the sphere includes "all the water in the oceans, seas, ice caps, lakes and rivers as well as groundwater, atmospheric water, and even the water in you, your dog, and your tomato plant."

I shared this with my 4th grade water-loving-mermaid daughter, and she was distraught. "It looks like it might just disappear," she sighed.

I told her that the point of the picture is to illustrate how precious our water is. Treasure it, worship it, conserve it, but don't take it for granted. 

Who knows, I may just have the next Alexandra Cousteau in my midst ...