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Table 8 Student-Newman-Keuls' (SNK) Test and Waller-Duncan K-Ratio (WD) T Test Comparison of Chlorophyll a concentrations for Nitrogen plus Phosphorous (N+P) 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 0.98 0.53      E      E F
  NB-02 10 5.19 1.86 A B C     B C    
  NB-04 8 5.73 1.36 A B      B C    
  NC 10 2.67 0.82    C D E     D E  
  MB 10 5.87 1.93 A B      B C    
April 5 – 19, 1998 NC 10 1.21 0.60      E      E F
  MB 10 0.91 0.63      E      E F
May 11 – 26, 1998 NB-01 9 0.37 0.13      E       F
  NB-02 8 8.07 6.69 A      A      
  NB-04 7 4.41 1.77   B C D     C D   
  NB-05 8 6.13 2.54 A B      B C    
  HC 8 1.16 0.58      E      E F
  MB 8 6.35 2.94 A B     A B     
July 30 – August 13, 1998 NB-04 9 4.55 1.92   B C     B C    
  NB-05 8 2.15 0.50     D E      E F
October 10 – 24, 1998 NB-01 6 0.73 0.20      E       F
  NB-02 6 1.50 1.09      E      E F
  NB-03 7 1.56 1.55      E      E F