Table 2 Thirteen simulated scenarios worked with giant (38), large (20–21), medium (10), or small (2) communities of ‘A’ (DBI = 8–9), ‘B’ (DBI = 4–5), ‘C’ (DBI = 2–3) or ‘D’ species (DBI = 0–1).

From: Sum or mean in calculation of qualitative scoring methods using the Dragonfly Biotic Index, and an alternative approach facilitating conservation prioritization

Simulated scenarios

DBIsum

DBImean

Permutational DBI potential

DBIsum rank

DBImean rank

Permutational DBI rank

giant com. (20 ‘A’ sp. + 18 ‘D’ sp.)

163

4.29

1.000

2

5

1

giant com. of ‘D’ sp.

54

1.42

0.000

5

9

7

large com. of ‘A’ sp. + 1 ‘B’ sp.

167

7.95

1.000

1

3

1

large com. of ‘A’ sp.

162

8.10

1.000

3

2

1

large com. of ‘C’ sp.

34

1.70

1.000

7

8

1

large com. of ‘D’ sp.

8

0.40

0.188

11

10

6

medium com. of ‘A’ sp.

85

8.50

1.000

4

1

1

medium com. of ‘B’ sp.

45

4.50

1.000

6

4

1

medium com. of ‘C’ sp.

18

1.80

0.997

9

7

3

medium com. of ‘D’ sp.

4

0.40

0.439

12

10

5

small com. of ‘A’ sp.

17

8.50

1.000

9

1

1

small com. of ‘B’ sp.

9

4.50

0.998

10

4

2

small com. of ‘C’ sp.

4

2.00

0.946

12

6

4

  1. DBIsum—the DBIsum, DBImean—the DBImean, Permutational DBI potential—percentile for the community DBI compared to a set of randomly assembled communities with the same species richness; DBIsum rank, DBImean rank, and Permutational DBI Rank—Rank based on DBImean, DBIsum, and permutational DBI potential, respectively—from the most to the least valuable community.
Back to article page