Table 1 Five groups were classified based on the frequency of co-occurrence relationships between pairwise OTUs

Always endemic links (only appeared in 1 plot)

4049

41.82%

314

Conditionally endemic links (1 < plots number ≤ 3)

2928

30.24%

209

Moderate links (3 < plots ≤ 10)

2206

22.78%

131

Conditionally common links (10 < plots ≤ 20)

342

3.53%

32

Always common links (plots > 20)

157

1.62%

9