User:Ji Won Shin/Notebook/Biology 210 at AU

January 31,2014

Introduction: observation of green algae of volvocine line and observation of niche and its biotic/abiotic factors

Purpose: to understand natural selection by looking at three green algae (Chlamydomonas, Gonium, Volvox) of the volvocine line in order to observe the selective functions that organisms have developed and to determine the biotic and abiotic characteristic of a niche in American University, forming a hay infusion at the end in order to determine organisms that exist in niche.

Materials and Methods:

Observations and Data:

Chlamydomonas Gonium Volvox Number of Cells 1 5 3 Colony size 25 4 2.5

                                     single-celled, egg-shaped cells            Colonies of cells ranging from      Thousands of cells that make of colony,

Functional specialization of cells that are easily visible, cup-shaped 4,8,16, and 32 cells;each able gametes, anterior/posterior pole of cell

                                     chloroplasts with pyrenoid,               to form new colony

flagella for movement

Reproductive specialization Isogamy Oogamy Oogamy (isogamy vs. oogamy)

Niche #4: Description: located in area across from Katzen Art Center, across Massachusetts Ave NW. Area constructed as drainage in case of snow and rain. Because of the purpose that

            it was built for, niche laid out with rocks and pebbles. Types of vegetation that can live with excess amounts of water and that have great absorptivity such as       
            cat tails. Mud and sand rather than dry dirt because of reasons mentioned before. Some grass at edge of transect. Humans and squirrels near transect. 

Abiotic Factors:

- air, wind
- dirt, sand, mud
- sunlight
- rocks,pebbles
- sidewalk
- moisture,water

Biotic Factors:

- plants (grass, cat tails), dead leaves
- humans
- squirrels
- fungi (on rock)
- bugs, worms

Image of Niche #4:https://drive.google.com/a/student.american.edu/file/d/0BzQOqxfdJTX9SC1iVGhIRDlPcTA/edit?usp=sharing Conclusions:

January 22, 2014- successfully added text