Expecting
Monarchs in Arkansas: News from the Nursery
Observations contributed by Dr.
Jim Edson
This female
monarch was captured in Arkansas on March 31, 2005. She had probably come
from Mexico. By late March, she had been alive for a long time! She had
survived last fall's migration to Mexico, the 5-month winter, and also
a 1,000-mile spring migration as far as Arkansas.
She is spending
the last days of her life in the safety of Dr. Jim Edson's lab laying
eggs for the next generation. Here's her egg count to date:
Egg
Count
Cumulative Total (by date) |
As
of this Date |
Total
# Eggs Laid |
Dr.
Edson's Comments |
#
Eggs Laid Today |
31
Mar |
?
(Nobody knows) |
Captured
in Monticello, Arkansas. Nobody knows how many eggs she had laid before
she reached Arkansas. |
|
1
Apr |
? |
No
new eggs yet... |
|
2
Apr |
? |
No
new eggs yet... |
|
3
Apr |
93 |
Well,
Ms. Monarch decided to start laying eggs Sunday, April 3rd. On that
day she laid 93. (The other female monarch I caught passed away
over the weekend.)
|
|
4
Apr |
147 |
Today,
April 4th, she has laid more for a two-day total of 147! Attached
is a picture of her in her nursery and a couple of shots of her
eggs. Some of her sisters have been coming through because my plants
outside now have close to 100 eggs on them. They are a little harder
to count, so I'm not sure of the exact total. Now all I need are
enough milkweed plants to feed them!!
|
|
5
Apr |
250 |
Well
Ms. Monarch is certainly loaded with eggs. Today she laid (to be correct,
I guess I should say oviposited) so many eggs she's reached 250. |
|
6
Apr |
322 |
Egg
count today makes the grand total 322. In just 4 days she has passed
the total for the spring 2002 monarch. If all of these eggs hatch,
I'm going to have trouble finding enough milkweed to keep them well
fed. |
|
7
Apr |
374 |
At
7:30 I put a fresh milkweed plant in with momma monarch. At 12:30
CDT she had laid 23 eggs in that 5 hours. At 4:12 pm CDT the final
egg count for the day brings her total to 374!! |
|
8
Apr |
436 |
In
addition to all of the eggs I already have, Ms. Monarch laid so many
more today that our total rose to 436. the eggs that were laid on
April 4th have started to hatch. Now I'm going to have a lot of hungry
mouths to feed. Dennis Thurman and his biology students at Drew Central
High School have been working in their greenhouse raising some milkweed
for me. I just hope there is going to be enough to go around. |
|
9
Apr |
497 |
New
eggs laid today bring the total to 497... |
|
10
Apr |
504 |
New
eggs laid today bring the total to 504... |
|
11
Apr |
504 |
No
new eggs laid today... |
|
12
Apr |
504 |
Or
today... |
|
13
Apr |
504 |
I
believe she is finished with her egg laying. I have caterpillars hatching
out all over the place. Due to the limited amount of milkweed available,
I have turned to using an artificial diet I was able to buy from Educational
Science Company. I tried it last fall with pretty good results.
I will probably move the larvae back over to milkweed as more becomes
available. I have been checking on the native milkweed in the area,
but it is just barely big enough to pick. If we have some warm weather
the rest of the week it should be ready to harvest. The tropical milkweed
in the greenhouse is almost ready as well, so by Monday (April 18th)
I should be in good shape.
|
|
14
Apr |
|
No
more news to report. Tomorrow one of my students will begin moving
some of the caterpillars into contains with the artificial diet. There
are probably close to two hundred at the 2nd instar stage |
|
Try
This!
- How
many eggs did Ms. Monarch oviposit each day? Fill in chart above.
- How
many eggs do you think she will lay in total?
- How
much longer do you think she will live?
- So
far, what is the average number of eggs she has laid per day?
- Graph
your results, and describe what you see. (Then see our
example.)
- Predict
how you think her egg-laying behavior will change over time.
National
Science Education Standards
- Use data
to conduct a reasonable explanation.
- Plants
and animals have life cycles that include being born, developing into
adults, reproducing, and eventually dying.
- Reproduction
is a characteristic of all living systems; because no individual organism
lives forever, reproduction is essential to the continuation of every
species.
National
Math Standards
- Compute
fluently and make reasonable estimates.
- Solve
problems that arise in mathematics and in other contexts.
- Develop
and evaluate inferences and predictions that are based on data.
|