Signs of Spring Everywhere Update: April 26, 1999
Today's Report Includes:
Migration in Full Force!
The Air Is Full of Food!
Tiny organisms, from pollen to uni-cellular and multi-cellular animals, fill the skies like plankton fill the ocean. So these microscopic organisms are called "aeroplankton." They form the huge foundation for a food pyramid in the sky.
Some tiny insects eat the aeroplankton. Other insects in the sky eat other things--like mosquitoes. Some small
creatures in the air are simply migrating--they fly or float on air currents, sometimes moving hundreds or even
thousands of miles. Baby spiders ride threads of silk that carry them through the air like balloonists. Some
of these little creatures are eaten by dragonflies and other flying predators, and some of the predators are eaten
by birds. It's a jungle up there!
Challenge Question #19
"What is 'plankton'? How is it similar to aeroplankton? How is it different?
Birds That Dine on the Wing
Scientists may not have noticed them up there for a while, but birds have taken advantage of the ecosystem in the sky for thousands of years. Some of the birds that eat flying insects are:
Here's a sign of spring that few people notice: When you go home tonight, look at the windshield and front grille of your car. Can you find any insects? Another fun way to see insects in the night sky is to shine a flashlight straight up and look in the beam. Plan to look once a week and count how many different kinds of insects you can find. Wetlands and areas near lakes and rivers often produce the biggest variety of flying insects.
Challenge Question #20
"Why do we usually find more flying insects over wetlands, lakes and rivers than over fields and forests?"
Discussion of Challenge Question #13
"To ensure a species' survival, why is it necessary to protect the breeding grounds, the wintering grounds, AND important staging areas? Explain."
Birds need all three areas at critical points in their lives. As Ms. Kelly's 7th graders in Fairfax, VA, wrote, "The breeding ground is important because the swans can increase their population. The wintering ground is important because they will have enough food there and they will be safe from the threat of freezing. The staging ground is important because they will be able to rest, have food, and spot familiar landmarks."
Discussion of Challenge Question #14
"Name at least one situation when a transmitter can actually save a bird's life." If a bird is in great trouble, the transmitter may show it in the same spot day after day, and the researcher may be able to locate and rescue it. For example, one Snowy Owl researcher in Duluth, MN, put two radio transmitters on owls, and after a few days, lost one signal. He drove all over the city and surrounding area, and finally picked up a very faint signal. He had to find it from two other locations in order to pinpoint the exact location. The owl had dropped down a chimney into an abandoned hotel, and he traced the owner and rescued the very hungry but still healthy owl. He also found two mummified Snowy Owls and several dead pigeons in that room. Without his transmitter, the Snowy Owl would definitely have died.
Discussion of Challenge Questions #15 and #16
Calculate Roast and Sir Syd's weights in pounds. How many math books would balance one of them?" Roast weighed 7400 g or 16.3 pounds, and Sir Syd weighed 5150 g or 11.4 pounds. Why are males heavier? Third Graders Cameron, Ardenia, Jesse, and Eliza thought this through very carefully! They wrote, "We think that the male swans are larger than the females because the male needs to protect the family. They both can eat about the same. The female has to use up a lot of calories just to make the eggs. The male can use the calories to grow bigger."
How to Respond to Today's Challenge Question
Please respond to only one question in each e-mail message.
1. Address an e-mail message to: firstname.lastname@example.org
2. In the Subject Line of your message write: Challenge Question #19 OR #20
3. In the body of your message, answer the question.
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