Table 2 Comparison between observed data and expected data (χ 2 test), based on the proportions between macroalgae species
From: Tracking macroalgae introductions in North Atlantic oceanic islands
|  | χ 2 value | Df | P |
|---|---|---|---|
Global | |||
 Total spp. versus NIS | 4.86 | 2 | 0.0900 |
Global versus Azores | |||
 Global spp. versus Azores (total) spp. | 0.99 | 2 | 0.9800 |
 Global NIS versus Azores NIS | 25.49 | 2 | 0.0001 |
Within Azores | |||
 Native spp. versus NIS | 17.25 | 2 | 0.0002 |
 Native spp. versus cryptogenic spp. | 0.10 | 2 | 0.9500 |
 Cryptogenic spp. versus NIS | 29.56 | 2 | 0.0001 |