University of Minnesota
http://www.umn.edu/
612-625-5000

Ecology Fair University of Minnesota Monarch Lab

Abstracts from McGuire Junior High School 2000

McGuire Junior High School
21220 Holyoke Ave W
Lakeville, MN 55044

Year: 2000
Teacher(s): Georgie Molitor

Are Pupation Rates Affected by Movement of Light?

Mallory L

Monarch caterpillars were put under six different lights: black light, strobe light, timed light, no light, constant light and normal light.  The purpose was to find out what light would cause the caterpillars to pupate quickest.  Three small caterpillars and three large caterpillars were put under each light. Each day the caterpillars were measured and data was recorded. On the seventh day there were three pupas in black light and no pupas in the other lights. All of the caterpillars had pupated by the sixteenth day. From the test it was concluded that the black light sped up the caterpillars growth rate and caused them to pupate quickest. Some of the caterpillars may have developed parasites under the black light as three of the five emerged Monarchs died.


How is Growth Affected by Strobe Light?

Kelsey F

Monarch caterpillars were put under strobe light and normal conditions. The purpose is to see if the caterpillars under strobe light will be larger or smaller in size than normal. The caterpillars were at third and fourth instars when we exposed them. Each day they were taken out and measured. After about twenty days passed data charts were made of all the information recorded. With the measurements of weight, length and width it was concluded that the caterpillars were wider and heavier under strobe light compared to normal. They are much shorter in length than the normal caterpillars by about a centimeter. From all the testing it can be concluded that the caterpillars under the strobe light were reasonably larger then the normal. If there could be new testing it would show more accurate results if the caterpillars were put under strobe light as eggs and not fourth and third instar. It would also be more accurate if there were more than 6 caterpillars tested.


In What Temperature will Caterpillars Pupate Fastest?

Maren V

Thirty caterpillars were divided into hot, cold, and normal temperatures.  The width of the caterpillars was measured until they pupated.  The date of pupation was recorded.  The caterpillars in the hot, cold, and normal had various results for pupation rate.  The hot caterpillars took an average of 11.5 day to pupate.  The cold caterpillars took an average of 14.5 days, and the normal pupated in 11.25 days.  There was one death in hot, three in cold, and one in normal.  Temperature does affect the pupation rate of Monarch caterpillars.  The cold temperature slowed down the growth and pupation rate while hot temperature sped up the growth rate of caterpillars.


Monarch Rate of Growth in Different Movements of Light

Rick T

What would happen if caterpillars were raised under constant light, black light, timed light, strobe light, no light, and normal light? I was caretaker of constant light. I noticed the caterpillars grew huge and had dark colored skin. I noticed that the pupa was a light color. When the butterflies emerged they looked lighter in color and had little wings. The butterflies in the different cages had pretty distinct differences that were noticed.  Therefore, movement of light does affect the growth rate and color of monarchs.


Will a Caterpillar Eat More in a Dry Environment than a Caterpillar in a Moist Environment?

Jenna L

The purpose of this experiment was to find out if the caterpillars in a dry environment would eat more than the caterpillars in a moist environment.  This experiment was also conducted to find out how the environment affects growth rate from a larva to an adult and the life span of a caterpillar. The results in this experiment showed that environment is extremely important in the growth rate from a larva to an adult and the life span of a caterpillar.  The original hypothesis assumed that the caterpillars in a dry environment would eat more to restore the fluids in their bodies.  However, the experiment found that the caterpillars could not overcome the difficulties of a poor environment. The caterpillars in the moist environment ate more than the caterpillars in the dry environment. The caterpillars in a moist environment ate more than the caterpillars in a dry environment. The results in this experiment also showed that environment is extremely important in the growth rate from a larva to an adult and the life span of a caterpillar.  It is a fact that milkweed leaves have a lot of liquid in them meaning the caterpillars in the dry environment would eat more to restore their liquids.  Caterpillars in the dry environment would need more liquids, which is contained in the foods.


Will Pupae Die in Cold Temperatures?

Mariah W

Ten caterpillars were in hot, cold, and normal conditions. The death rate of the pupas was recorded. Before the caterpillars became pupas I took care of them I fed them and cleaned out their cage when necessary, then when they were pupas I recorded how many days it took them to pupate and if any of the pupas died. The percentages of the pupas mortality for both large and small cold was 20% which is a very small amount. The mortality rate for hot/small is 0%; all of them lived. However in hot large 60% was the mortality rate. Normal was also 30%. The pupas in cold only had one butterfly.  Temperature does affect the pupation rate and mortality of pupa.


  • © 2015 Regents of the University of Minnesota. All rights reserved.
  • The University of Minnesota is an equal opportunity educator and employer. Privacy