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Table 2 Pairwise sequence divergence (PSD) between IGS sequences from ten individuals representing four species in the Daphnia pulex complex.

From: Evolution of the nuclear ribosomal DNA intergenic spacer in four species of the Daphnia pulex complex

Region Species D. pulex NA D. pulicaria D. tenebrosa D. pulex E
complete IGS1 D. pulexNA 0.009 [0.001]2    
  D. pulicaria 0.019 [0.002] 0.018 [0.002]   
  D. tenebrosa 0.017 [0.002] 0.019 [0.002] n/c 3  
  D. pulexE 0.033 [0.002] 0.029 [0.001] 0.029 [0.002] 0.038 [0.002]
  Intraspecific mean PSD 0.022 [0.009]   
  Interspecific mean PSD 0.024 [0.003]   
N14 D. pulexNA 0.006 [0.002]    
  D. pulicaria 0.043 [0.007] 0.023 [0.004]   
  D. tenebrosa 0.028 [0.006] 0.029 [0.005] n/c  
  D. pulexE 0.043 [0.005] 0.034 [0.003] 0.030 [0.004] 0.043 [0.004]
  Intraspecific mean PSD 0.024 [0.011]   
  Interspecific mean PSD 0.035 [0.003]   
N25 D. pulexNA 0.008 [0.001]    
  D. pulicaria 0.011 [0.001] 0.015 [0.002]   
  D. tenebrosa 0.015 [0.002] 0.017 [0.002] n/c  
  D. pulexE 0.026 [0.002] 0.028 [0.002] 0.029 [0.002] 0.035 [0.002]
  Intraspecific mean PSD 0.019 [0.008]   
  Interspecific mean PSD 0.021 [0.003]   
A-repeat D. pulexNA 0.068 [0.011]    
  D. pulicaria 0.081 [0.010] 0.101 [0.013]   
  D. tenebrosa 0.063 [0.009] 0.081 [0.010] 0.070 [0.012]  
  D. pulexE 0.082 [0.010] 0.096 [0.011] 0.079 [0.010] 0.093 [0.011]
  Intraspecific mean PSD 0.083 [0.008]   
  Interspecific mean PSD 0.080 [0.004]   
B-repeat D. pulexNA 0.158 [0.023]    
  D. pulicaria 0.158 [0.021] 0.176 [0.025]   
  D. tenebrosa 0.143 [0.020] 0.154 [0.021] 0.184 [0.028]  
  D. pulexE 0.160 [0.021] 0.161 [0.021] 0.156 [0.021] 0.162 [0.022]
  Intraspecific mean PSD 0.170 [0.006]   
  Interspecific mean PSD 0.155 [0.003]   
C-repeat D. pulexNA 0.036 [0.010]    
  D. pulicaria 0.032 [0.008] 0.036 [0.009]   
  D. tenebrosa 0.033 [0.009] 0.033 [0.008] 0.039 [0.010]  
  D. pulexE 0.033 [0.008] 0.033 [0.008] 0.030 [0.008] 0.052 [0.016]
  Intraspecific mean PSD 0.041 [0.004]   
  Interspecific mean PSD 0.032 [0.000]   
  1. 1. Repeat arrays have been replaced with one copy of the consensus for each repeat type in the complete IGS sequences.
  2. 2. Values in square brackets are standard errors.
  3. 3. Value not calculated as only one sequence was determined for D. tenebrosa.
  4. 4. N1 is the nonrepetitive region downstream of the 28S rRNA gene
  5. 5. N2 is the nonrepetitive region upstream of the 18S rRNA gene.