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11 months in my microaquarium (my wiki)

Akayi's poster. Presented at Bay Area Honors Research Symposium | Published in ThinkYou!
Nicole's poster. Presented at Skyline Research Symposium

Counting numbers of organisms. A semi-log graph gives a better idea of what's happening: Now you can see organisms B and C grew during the first 40 days and organism A's population wasn't doing much.

Qualitative analysis: recording presence of organisms on a scale of 0 (none seen), 1+ (one or two seen), 2+, 3+, 4+ (maximum)

Construct a food chain or food pyramid of your observed community.

Calculating generation time. Select one time near the beginning of log-phase growth and one near the end; or look for doubling of cell number.

 

 

 

Log no of organism X

 

Day

Heterotrophs

 

6

0.70

 

8

1.30

 

13

1.30

 

15

1.30

 

20

1.40

NE

29

2.30

 

34

2.85

 

50

2.52

 

52

2.59

 

55

2.30

 

60

2.52

 

64

2.64

N0

66

3.03

 

 

 

 

# generations

4.14

=(NE-N0)/0.301

generations/day

0.12

=no gen/no days

generations/day

8.46

=1/(gen/da)

hours/generation

0.35

 
minutes/generation

21.1