Skip to main content

Table 7 Student-Newman-Keuls' (SNK) Test and Waller-Duncan K-Ratio (WD) T Test Comparison of Chlorophyll a concentrations for Control treatments using Passive Diffusion Periphytometers in the Bosque River Watershed for all sites sampled during the indicated periods. SNK and WD Groups represent values from discrete populations, when compared across all dates.

From: Measuring variability in trophic status in the Lake Waco/Bosque River Watershed

Date

Site

Number of Replicates

Mean Chl. a (ug cm-2)

Std Dev. (ug cm-2)

SNK Group (α = 0.05)

  

WD Group (α = 0.05)

July 17 – 30, 1997

NB-01

10

0.88

0.60

  

C

    

E

F

 

NB-02

10

4.58

0.86

 

B

  

B

    
 

NB-04

10

1.73

0.37

  

C

  

C

D

E

F

 

NC

10

0.48

0.14

  

C

  

C

  

F

 

MB

10

0.47

0.20

  

C

  

C

D

 

F

April 5 – 19, 1998

NC

10

0.71

0.26

  

C

    

E

F

 

MB

10

0.56

0.27

  

C

    

E

F

May 11 – 26, 1998

NB-01

8

0.40

0.16

  

C

    

E

F

 

NB-02

9

9.02

6.95

A

  

A

     
 

NB-04

9

2.50

0.70

  

C

   

D

E

 
 

NB-05

9

2.69

0.80

  

C

    

E

 
 

HC

7

1.46

0.48

  

C

  

C

D

E

F

 

MB

8

0.83

0.13

  

C

    

E

F

July 30 – August 13, 1998

NB-04

8

0.49

0.24

  

C

    

E

F

 

NB-05

9

0.99

0.26

  

C

    

E

F

October 10 – 24, 1998

NB-01

7

0.80

0.34

  

C

    

E

F

 

NB-02

6

1.94

1.19

  

C

  

C

D

E

 
 

NB-03

7

0.61

0.18

  

C

    

E

F