A group of students investigated the biodiversity of insect species in two agricultural fields: an organic field and a conventional field. The counts of five different insect species found in the organic field are shown in the table below:
| Species | Number of individuals (nnn) |
|---|---|
| Ladybird | 24 |
| Lacewing | 6 |
| Ground beetle | 12 |
| Hoverfly | 18 |
| Aphid | 10 |
| Total (NNN) | 70 |
Use the formula:
D=1−∑(nN)2 D = 1 - \sum \left(\frac{n}{N}\right)^2 D=1−∑(Nn)2to calculate the Simpson's Index of Diversity (DDD) for the organic field. Give your response to three decimal places.
24 exam-style questions on OCR A A Level Biology Biodiversity. Each one has a worked solution and a mark scheme showing where the marks go.