Type your answer on the lines below, or write it out on paper.
The number of individuals of each soil arthropod species was recorded in an organically managed field and an intensively managed field of the same size.
| Arthropod species | Organic field | Intensive field |
|---|---|---|
| A | 18 | 40 |
| B | 14 | 12 |
| C | 10 | 6 |
| D | 7 | 2 |
| E | 5 | 0 |
| F | 3 | 0 |
| G | 2 | 0 |
| H | 1 | 0 |
| Total (N) | 60 | 60 |
Complete the analysis by giving the species richness of each field.
Calculate the index of diversity of the intensive field. Show your working.
Use d = N(N − 1) / Σn(n − 1).
The index of diversity of the organic field was 5.46. Both fields contained 60 arthropods.
Deduce what the data show about the effect of intensive management on soil biodiversity.