Factors That Affect Population Growth

1616 WordsApr 24, 20177 Pages
Introduction- Tribolium confusum, more commonly known as the confused flour beetle, is frequently used in scientific observations typically regarding population growth with experiments using these beetles dating back decades ago (Medici and Taylor, 1966). The beetles are relatively easy to handle, cheap to feed, and provide a short reproductive cycle allowing for multiple experiments in a short time span (Park, 2013). Tribolium confusum’s dietary habits consist of mainly grain based products such as wheat and flour. Therefore, these fast reproducing beetles embody the type of organism this research project requires. The nature of the experiment is intended to study, analyze, and calculate the differences in population growth between…show more content…
Finally, vial four became known as treatment three and acquired both ten grams of the growth medium and two grams of the potting soil. Following this, the vials were capped with a soft cork and were stored in a dark closet. Data was collected on a weekly basis where each group member was responsible for counting one vials worth of beetles and larvae. The vials were dumped out and sifted through a screener so that only the organisms remained. They were then dumped into a petri dish to allow for easier examination. The beetles were counted individually while the larvae dish was divided into quarters, counted in sections, and then multiplied by four to come to an estimated total larvae population. Once the final week’s information was collected, all data was averaged between six groups showing how each treatment illustrated differences in population growth. Results- Table 1 – Group Beetle Population Growth Table 2 – Average Class Beetle Population Growth Table 3 – Group Larvae Total Table 4 – Average Class Larvae Population Table 1 shows the groups beetle population as the experiment progressed. In week one, the control group, (C), started with 22 beetles, Treatment 1, (T1), started with 25 beetles, Treatment 2, (T2), started with 24 beetles, and Treatment 3, (T3), started with 23 beetles. In week four, all vials showed population growth. Group C showed the least amount of growth with a population of 159, while T1 had 141, T2 had 120, and T3 had 78. In week six,
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