Linda Pineda
Environmental Science 1301
Dr. Pollack
9 November 2016
Beetle Populations
The purpose of this experiment was to be able to analyze the rate of reproduction for a beetle population. This date will continue to either increase or decrease and will determine the different factors that have a role in population. The organism that was chosen was the flour beetle and the reason for choosing this beetle is because they are small, they have short life cycles, and they require little care due to the fact that they spend their entire life cycle in in dry flour. The beetles are also easy to count and are not fragile to the way in which they are handled. The reason this problem of interpreting change in size of real population is so important is because it is able to project the way in which the human population could be determined and how we can move forward in being able to better prepare such as expanding or decreasing certain resources in order to meet the needs of the population. The prediction is that the population of the beetles is expected to grow due to the environment that it has been exposed to.
For the procedure of this experiment first of all one level scoop of flour was placed into a vial. Afterwards ten adult flour beetles were selected at random and placed in the vial and tubed. They were set in a twenty eight degree celsius incubator after their group name and start date of experiment were written on the outside. Every two weeks the beetles were dumped out and counted in order to be counted and only the full grown adult beetles were taken into count and the deaths were also recorded in order.The beetles were counted for a total period of eight weeks and on the dates the result were recorded were on August 31, September 14 and 28, and October 12 and 26 for a total of five different days.
The results that were found next were as expected. The beetle population increased but one of the two groups increased at an alarming rate.The beetle population was either doubling or tripling every two weeks. The date can be seen on the table below.
Date
Number of Live Adults
Group1/Group 2
Number of Dead Adults
Group1/Group 2
Notes
8/31
10/10
0/0
Experiment begins
9/14
7/8
3/2
A couple of beetles did not survive
9/28
7/8
4/2
Population is growing slowly
10/12
95/76
8/2
Population has skyrocketed!
10/26
396/199
12/18
Population has almost tripled for group 1.

The results of the experiment were able to show that the population did increase but there was a difference with the growth rate in group 1 versus group 2
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Although the outcome was as predicted the way in which the same variables produced different results were confound. Looking at the results and how the reproduction rates were different there were many conclusions drawn as to why there were different results, one was that the maturity age of reproduction were different and therefore group 1 was increasing at a higher rate. Second it would have been possible that out of the ten beetles there were more females in the beginning or reproduced in order for the rate to increase significantly. One of the variables that was not completely accurate was the sex of the beetle population. If there were to have been exactly five females and five males there would have been a greater possibility that the finalized population would have been more similar. Although it cannot be proven with this procedure, if it were to be run and analyzed again further predictions could be made as to how fast the beetles reproduce and as to how accurately the first run of the procedure was.