Grain size Species P-value
3 x 3 m (9 m2) Native <0.001*
1 x 1 m (1 m2) Native <0.001*
3 x 3 m (9 m2) Alien <0.001*
1 x 1 m (1 m2) Alien <0.001*
Δ9-1 Native 0.007*
Δ9-1 Alien 0.138