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22.3: Lab Report

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    1. What types of events could “reset” a succession process? Name at least one biotic and one abiotic disturbance.
    2. Explain how this retreat will result in different communities along the glacier’s retreat, though in similar environments. Hint: what is the difference between exposed soil at point A and point B.

    Progression of the ecosystem, beginning at exposed rocks and progressing towards a climax forest.

    1. What are some advantages to using bacteria as opposed to plants in this experiment?
    2. What factors might speed or delay a successional process? Apply your example to succession in milk.
    3. What hypotheses are you testing? List both here.
    4. What information led you to ask these hypotheses?
    5. Make predictions about your hypotheses. i.e. How will you know if the data supports or refutes your hypotheses?
    6. Be sure to identify the variables you will test, and those you will control for each experiment.
    7. Prepare a table for data collection. You will be recording the pH, smell, consistency, and bacteria shapes and colors present in your milk samples.
    8. Describe the changing sequence of organisms and corresponding environmental changes during succession in the milk samples. Which bacteria are in each of your milk samples?
    9. Describe the changing sequence of organisms and corresponding environmental changes during succession in chocolate milk. Do the results of your investigation match your hypothesis?
    10. Compare succession in one or more types milk. Propose reasons for differences.
    11. Propose another experiment to test the environmental factors and/or organisms changing in your proposed scenario for milk succession.
    12. How could you improve your test of the hypotheses? Be specific!
    13. Identify what happened to the pH of the milk as time passed.
    14. Infer what the change in pH means about the populations of microorganisms in the milk.

    LICENSES AND ATTRIBUTIONS

    CC LICENSED CONTENT, ORIGINAL

    • Community Ecology Lab. Authored by: Dr. William Edwards. Provided by: Niagara University. Located at: [www.niagara.edu]. License: CC BY: Attribution

    CC LICENSED CONTENT, SHARED PREVIOUSLY

    • Biology 102 Labs. Authored by: Lynette Hauser & Dr. James Holden. Provided by: Tidewater Community Colleg. Located at: [www.tcc.edu]. License: Public Domain: No Known Copyright

    This page titled 22.3: Lab Report is shared under a CC BY 4.0 license and was authored, remixed, and/or curated by Darcy Ernst, May Chen, Katie Foltz, and Bridget Greuel (Open Educational Resource Initiative at Evergreen Valley College) .