Update: April 10, 2008
Your Sightings! >>
Questions and Highlights
to the North, Expanding to the East >>
Room on Your Map: More Are Monarchs Coming Soon! >>
and Migration >>
Go East? >>
Lincoln Brower, Sweet Briar College
Mystery Photo >>
The Migration: Maps, Questions and Highlights
Stalled to the North, Expanding to the East
is a fascinating time of the migration. Notice how far east
the monarchs have gone and how little they have moved to the north.
If we measure from a central point in Texas (San Antonio), the monarchs
have flown 1,000 miles to the east and only 500 miles to the north.
They'd be in South Dakota by now had they gone straight north. Yet,
for nearly two weeks, the northernmost monarch on our map has not
surpassed the Oklahoma sighting at latitude 37 N. Meanwhile, the
monarchs have jumped eastward — across Arkansas, Mississippi,
Alabama, Georgia and Tennessee where on Monday....
first grade class at Union Elementary in Gallatin, TN, was pulling
weeds in the vegetable garden when a monarch butterfly flew over
our heads. The monarch was faded but beautiful. We were excited
to see one return from the long journey from Mexico. We have a
butterfly garden by the fence but the milkweed and butterfly weed
have not emerged yet. The monarch did not stop."
were also reported this week from North and South Carolina. Did
those monarchs came up from Mexico? Biologist Billy McCord tagged
monarchs on the South Carolina coast this winter. His results suggest
that some monarchs survived all winter along the coast.
about tagging monarchs
on the South Carolina coast >>
the animation. Do you think it suggests that the Carolina
monarchs are from Mexico? >>
where the monarchs will go next! Add 4 new states to
your list of states where the migration has arrived. Make your
predictions and record the results on this Prediction
Room on Your Map: More
Are Monarchs Coming Soon!
butterflies of the next generation are about to be born! The monarchs
that entered Texas and began laying eggs the week of March 15th
had spread across the state within a week. (See map below.) Eggs
collected on March 21st by Carol Cullar in Eagle Pass hatched on
the 24th and began going into the chrysalis stage on April 6th.
According to her prediction, these new monarchs should appear by
April 15th. Temperatures have been mild and the full cycle should
take only 26 or 27 days. "We've had mild weather with temps
mostly in the 80s," she explains.
and Migration >>
Go Northeast? >>
effect do temperatures have on the pace of migration? Here
are migration and temperature maps over four years for you
to compare. Take a look!
orange arc on this map shows where monarchs would be now if
they had spread equally in all directions.
Why do they advance most quickly to the northeast?
Do You Know a Monarch When You See One? >>
and fall we rely on hundreds of observers to track the monarch's migration.
These observers expand the eyes and ears of scientists in ways not possible
before the Internet. But their observations must be accurate in order
for the data to be valid and useful. Remember: Our migration maps are
only as accurate as the people who report observations.
Can you identify
a monarch from its look-alikes? Please practice! >>
Question #9: Did
These Observers See Monarchs? >>
read some of the real, questionable observations that have been reported
to Journey North.
- Do you
think these observers saw monarchs? Decide whether these sightings
should be included on the migration map. Give reasons for your decisions.
to last week's Challenge Question #8 >>
Monarch Butterfly Resources to Explore
Next Monarch Migration Update Will Be Posted on April 17, 2008.