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Table 1 Best-fitting models of dN/dS (ω) across 2091 loci analyzed. For each model, the absolute number (and proportion) of loci for which that model best explained the data (according to AIC) is provideda

From: Transcriptome sequencing reveals genome-wide variation in molecular evolutionary rate among ferns

Model

# Loci

Positive selection

ω > 1

Neutral

ω = 1

Purifying selection

ω < 1

ωT = ωV = ωB

888 (42.4 %)

1 (0.11 %)

0

887 (99.9 %)

ωT = ωB ≠ ωV

467 (22.3 %)

   

ωT = ωB

 

0

0

467 (100 %)

ωV

 

3 (0.64 %)

49 (10.5 %)

415 (88.9 %)

ωT ≠ ωV = ωB

318 (15.2 %)

   

ωT

 

0

0

318 (100 %)

ωV = ωB

 

0

2 (0.62 %)

316 (99.4 %)

ωT = ωV ≠ ωB

294 (14.0 %)

   

ωT = ωV

 

0

0

294 (100 %)

ωB

 

1 (0.34 %)

2 (0.68 %)

291 (98.9 %)

ωT ≠ ωV ≠ ωB

124 (5.9 %)

   

ωT

 

0

0

124 (100 %)

ωV

 

0

8 (6.45 %)

116 (93.5 %)

ωB

 

1 (0.81 %)

1 (0.81 %)

122 (98.4 %)

  1. aωT = estimated average dN/dS across all sampled taxa with the exclusion of vittarioid ferns and their subtending branch; ωV = estimated average dN/dS for vittarioid ferns; ωB = estimated dN/dS for branch subtending vittarioid ferns (see Fig. 3)