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:

- 1 observed cell with colony size of 25.
- single celled
- egg-shaped cells that are easily visible
- cup shaped chloroplast with pyrenoid
- flagella for motility
- Isogamy

Gonium:

- 5 observed cell with coloy size of 4
- colonies normally range from 4,8,16,32 cells, each able to form a new colony
- Oogamy

Volvox:

- 3 cells observed with 2.5 colony size
- thousands of cells that make up colony
- has gametes
- has anterior/posterior pole of cell
- 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