Skip to main content

Table 2 Summary of multivariate PERMANOVAs of the effect of substratum orientation and succession length or starting season on assemblage structure

From: Succession in subtidal macrofouling assemblages of a Patagonian harbour (Argentina, SW Atlantic)

Source df MS pseudo-F P
Succession analysed at quarterly intervals
Surface orientation 1 27857.2 29.29 0.001
Succession length 3 4919.7 5.17 0.001
Surface orientation × succession length 3 4291.3 4.51 0.001
Residual 24 951.2   
  t P
Pairwise a posteriori comparisons
Lower surfaces
 3 months versus 6 months 2.74 0.012
 3 months versus 9 months 2.56 0.010
 3 months versus 12 months 3.92 0.002
 6 months versus 9 months 1.73 0.048
 6 months versus 12 months 1.48 0.124
 9 months versus 12 months 1.98 0.025
Upper surfaces
 3 months versus 6 months 1.68 0.080
 3 months versus 9 months 3.51 0.003
 3 months versus 12 months 1.54 0.130
 6 months versus 9 months 1.97 0.063
 6 months versus 12 months 1.01 0.374
 9 months versus 12 months 1.26 0.239
Source df MS pseudo-F P
1-year-old assemblages starting at different seasons
Surface orientation 1 23564.2 29.80 0.001
Starting season 3 2572.3 3.25 0.008
Surface orientation × starting season 3 2265.4 2.86 0.009
Residual 24 790.8   
  t P
Pairwise a posteriori comparisons
Lower surfaces
 Summer versus autumn 1.94 0.048
 Summer versus winter 0.86 0.529
 Summer versus spring 0.74 0.649
 Autumn versus winter 2.15 0.026
 Autumn versus spring 2.17 0.017
 Winter versus spring 0.70 0.711
Upper surfaces
 Summer versus autumn 1.30 0.219
 Summer versus winter 1.42 0.144
 Summer versus spring 1.98 0.039
 Autumn versus winter 3.53 0.004
 Autumn versus spring 5.30 0.002
 Winter versus spring 1.24 0.211
  1. Significant results in bold
  2. df Degrees of freedom, MS mean square, F F ratio, P Monte Carlo probability values associated with F values, t multivariate version of the t-statistics (based on distances)