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Table 1 Numbers of observed pair matings and estimates of sexual isolation across experimental designs.

From: Sexual and postmating reproductive isolation between allopatric Drosophila montana populations suggest speciation potential

   Number of matings   
Experimental Design Number of
replicate trials
OO OV VO VV I PSI ± 1SD P- value
Expt. 1: No-choice 122 23 23 13 22 0.132 ± 0.114 0.252
Expt. 2: Female-choice 90 23 20 9 28 0.310 ± 0.108 0.004*
Expt. 3: Multiple-choice 6 55 34 35 55 0.223 ± 0.074 0.005*
  1. *Indicates non-random mating, i.e. significant premating isolation