Manatee Migration Update: March 3, 1999 Today's Report Includes:
Still With Mom? Discussion of Challenge Question #3
Are Dmitra and Ivan still together now? As you look over the latest satellite data below, what do you notice? What's going on here? Today's Satellite Migration Data
(To respond
to this Challenge Question, please follow the instructions at the end of this report.)
So by multplying 60.34 miles by .021, we learned that they were approximately
1.267 miles apart. Ranger Wayne's Roll Call & Discussion of Challenge Question #5
"Two primary conditions affect the number of manatees present. The chief is water temperature. The colder the water in the St. Johns River, the more animals in the run. The other factor is timing. Their movements in response to temperature are not immediate. For example, if the manatees have been away during a long, warm period they may take several days to get back when the air turns cold. Therefore, counts on a cold day might be lower than expected. Similarly, the count on warm days after a very cold day may have more manatees. Also, they seem to sense the barometric change ahead of a large weather front, and come in ahead of it at times, no matter the water temperatures. Finally, we also see changes as the winter progresses. For example, during the first cold days in November the manatees respond more to cold than they do at this time of year." As you look at the latest data from Ranger Wayne, can you see these two conditions affecting the number of manatees in the run?
Can You Solve this Manatee Mystery? Over the past four weeks you've learned quite a bit about manatees; where they live, when and why they move, how far they usually travel. Just when you think you know it all, along comes "MO", another Sirenia Project manatee who took a
(To respond
to this Challenge Question, please follow the instructions at the end of this report.) By Land, Air and Sea!
Aerial Manatee Survey Results 1991 To 1999
(To respond to this Challenge Question, please follow the instructions at the end of this report.)
In Challenge Question #4 we asked why a Manatee cannot tolerate cold water as well as a whale? A Minnesota third grader (who knows about cold temperatures and probably wears a jacket when playing in the snow too) said "Because whales have more blubber." Anne from Terry Erickson's class, Creek Valley Elementary, Edina, MN, terickso@edina.k12.mn.us According to Cathy Beck, "whales have a thick layer of blubber under their skin that insulates them from the cold water. Although manatees have a layer of fat under their skin, it is never as thick as a whale's blubber. Also, like you and me, their fat can vary in thickness depending on how much the animal has been eating. If there have been several cold spells and the manatees have not eaten often, the fat layer becomes thinner; then the manatee is less able to tolerate the cold water. It would be like you going out to play in the snow without a jacket!" Try This--It's Really "Cool"! Manatee expert Bob Bonde and whale expert Ann Smrcina offer this experiment to help you test "first hand" why cold feels different to a manatee than it does to a whale. This may be a bit messy, but the experience is worth it! Materials Needed:
How long can you keep your unprotected hand in the water? 5. Thermometer Test
Reminder: Only 3 Days Left For Questions For Manatee "Ask The Expert" Hurry up, it's YOUR turn to ask the questions! This Friday, March 6th, is the deadline for submitting questions for Manatee Expert Nancy Sadusky.
How to Respond to Today's Challenge Questions: Please answer ONLY ONE question in each e-mail message!: 1. Address an E-mail message to: jn-challenge-manatee@learner.org 2. IMPORTANT: In the Subject Line of your message write: Challenge Question #6 (OR 7, OR 8 ) 3. In the body of the EACH message, give your answer to ONE of the questions above. The Next Manatee Migration Update will Be Posted on March 17, 1999.
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