Monarch Migration Update: April 13, 1999
Today's Report Includes:
Migration Surged Northward Last Week
As today's 48 new sightings show, last week was a good week to migrate!
Among the most surprising news:
How Far Did the Maryland Monarch Fly?
Wind, Weather and Migration
Why have migration conditions been so good over the past weeks?
Wintessing the Final Days of a Generation
Krahn Elementary School in Klein, Texas, created habitat for monarchs at their school: "We planted it for them--and they are really coming!" said third grade teacher Patty Perkins. "We know the monarchs from Mexico have arrived because of the vast numbers of eggs on our milkweed."
Last week, it seems Perkins watched as one monarch silently reached the end of the long trail:
"Today a tattered female monarch laid eggs on several milkweeds. She stayed for several hours and laid many eggs. This evening I found what appears to be the same butterfly dead. Do you believe she completed her mission from Mexico--and left us with the next generation to journey northward?" (email@example.com)
When Will the Children, Grand-children and Great-grandchildren Arrive?
The next generation of monarchs is now developing. If you live in the north, YOUR first monarch of the season may be the offspring of these Mexican migrants.
Depending on temperature, the time for development varies. But the typical number of days the monarch spends at each stage of development is:
Let's consider April 6th as the peak date of egg laying for the generation that over-wintered in Mexico. (In reality of course, monarchs are now at different stages of development all across their range. This question is only intended to help estimate the timing of monarch generations.)
Challenge Question #28
"Using the numbers above, what is the PEAK date the adults of each generation will emerge? How many generations could live this year, if you assume the eggs of the final generation are laid before September 1? Finally, what is the name of the generation that would migrate to Mexico?"
(To respond this question, please follow the instructions below.)
Speaking of Eggs
Discussion of Challenge Question #21
In our March 30 update we asked, "How many eggs do you suppose one monarch can lay?"
"We found out that a monarch could lay up to 400 eggs. We found the information from Monarch Watch. We think that is a lot for such a little creature. There must be a lot of eggs that are eaten before they are hatched or caterpillars that don't make it to the butterfly stage because we don't see that many butterflies around."
Ferrisburgh Central School, Grade Three
How to Respond to Today's Monarch Challenge Questions
1. Address an e-mail message to: firstname.lastname@example.org
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