Table 2 ANOVA results on the differences in diversity of microbial communities between patches invaded and uninvaded by O. stricta under the canopies of V. nilotica and S. africana and in open patches with no tree cover.

From: The invasive cactus Opuntia stricta creates fertility islands in African savannas and benefits from those created by native trees

Diversity

Factor

Df

Mean sq

F

p

Richness

Invasion

1

8,778,050

16.7

0.002**

Tree cover

2

3,442,078

6.6

0.012*

Invasion × tree cover

2

3,855,228

7.3

0.008**

Exponent of Shannon

Invasion

1

246,208

9.5

0.009**

Tree cover

2

103,953

4.0

0.046*

Invasion × tree cover

2

6743

0.3

0.775

Inverse Simpson

Invasion

1

19,264.1

9.9

0.008**

Tree cover

2

4868.2

2.5

0.123

Invasion × tree cover

2

21.8

0.0

0.989

Pielou’s evenness

Invasion

1

0.0375

12.4

0.004**

Tree cover

2

0.0320

10.6

0.002**

Invasion × tree cover

2

0.0079

2.6

0.114

  1. Significance indicated in bold as follows: *p < 0.05; **p < 0.01.
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