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Table 3 Comparison of observed and expected spatial distributions based upon the capture-zone model

From: The mechanisms responsible for 2-dimensional pattern formation in bacterial macrofiber populations grown on solid surfaces: fiber joining and the creation of exclusion zones

Population examined

 

Ratio of measuring/ capture-zone square size1

Number of grid squares containing structures

Chi-square

 
   

0

1

2

33

 

p

97–86

obs2

3

15

40

38

10

0.97

0.81

3 df4

 

exp2

 

13.0

38.7

38.5

12.8

  

97–142

obs

2

19

57

26

2

1.10

0.58

2 df

 

exp

 

21.5

52.0

31.2

0

  

916–150

obs

2

32

56

16

2

0.66

0.72

2 df

 

exp

 

32.8

52.3

20.8

0

  

916–444

obs

2

45

49

11

1

0.076

0.96

2 df

 

exp

 

44.9

48.2

12.9

0

  

920–125

obs

2

27

54

23

2

0.113

0.95

2 df

 

exp

 

26.5

53.0

26.5

0

  

920–400

obs

3

36

47

22

1

1.39

0.71

3 df

 

exp

 

37.0

46.6

19.6

2.7

  
  1. 1. The minimum link length (Y intercept from Table 2) from each population was used as as a guide to the length of a side of the capture zone square. The measuring square side length from Figure 6 was 5.5 mm for all populations. Ratios of 2 and 3 were chosen for illustration purposes with no attempt to optimize the fit to observed values. 2. exp are values predicted by the capture zone model, obs are values from Table 1. 3. Squares containing 4 (1), 5 (2) and 6 (1) are included for population 97–86. 4. df are the degrees of freedom used to obtain the p values above them.