User talk:Lila Glansberg
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Lab 1: A Study of Evolution and Ecosystems at AU--January 25, 2015
The purpose of this lab is to begin to understand the different types of life that exist on Earth. It is necessary to understand the basics of evolution before one studies diversity, as all life forms evolved from a common ancestor. By examining a transect of an ecosystem close to home, students can understand the high diversity of life that exists even in small areas.
Materials and Methods
Materials needed for this lab are: -samples of Chlamydomonas, Gonium, and Volvox -light microscope -soil/vegetation sample from transect -water -dried milk
Procedure 1: Prepare wet slides of and observe the three types of algae under a microscope. Note the number of cells contained by each specimen, the colony size, any cell specialization, and motility mechanisms. Note if the organism is isogamous or oogamous. Draw a picture of the organism under the microscope, and note the magnifying power.
Procedure 2: Examine the assigned transect and make a map of the area. Make a list of five biotic and five abiotic specimens within the transect. Take a soil/vegetation sample in a tube to bring back to the lab. This should be what you believe is the most accurate representation of your transect. Back at the lab, prepare a Hay Infusion Culture: Put 10-12 grams of the transect sample in a plastic jar with 500 mL of purified water. Add 0.1 gm of dried milk, place the lid on the jar and mix gently for 10 seconds. Remove the lid and store the jar in a safe place in the lab. Label the jar with your name and transect number.
Data and Observations
The transect assigned to me was farmland in the form of the AU community garden.
Five biotic elements: Cucumber Lettuce Brussel Sprouts Spinach Bushes
Five abiotic elements: Scarecrow Planting box Irrigation system (rubber hosing) Soil Snow
My transect has many plants growing there, and so I would predict the soil to be full of specimen that make it fertile. I would also expect to see organisms that feed off of plant material. The protists and bacteria I would expect to see would be ones that could survive in the varying temperatures and weather of DC, as well as survive off of the plant material (or fecal matter) that is present in the transect.