```r
# sites 35 to 40 and corresponding occurrences of the first five species in the
# community matrix
comm[35:40, 1:5]
#>    Alon_meri Alst_line Alte_hali Alte_porr Anth_eccr
#> 35         0         0         0       0.0     1.000
#> 36         0         0         1       0.0     0.500
#> 37         0         0         0       0.0     0.125
#> 38         0         0         0       0.0     3.000
#> 39         0         0         0       0.0     2.000
#> 40         0         0         0       0.2     0.125
```