Across
- 4. A widely used group of insecticides. They have been linked with the deaths of bees, especially when they act synergistically with some fungicides.
- 5. species One of the first species to colonise an area at the start of ecological succession. They are usually well adapted to extreme abiotic factors.
- 7. A chemical released by an organism that changes the behaviour of other members of the same species, especially to attract a mate.
- 9. An agricultural system that incorporates the principles of natural ecosystems.
- 11. The maintenance of a state of equilibrium.
- 14. A method of reducing soil erosion by creating a grid of raised ridges that cause rainfall to collect, increasing infiltration and reducing
- 16. The cultivation by turning the soil eg by ploughing.
Down
- 1. A form of polyculture where two or more different crops are grown in an area at the same.
- 2. An international organisation which aims to ensure the sustainable exploitation of whales.
- 3. A qualitative scale that judges the abundance of organisms. Dominant, Abundant, Frequent, Occasional, Rare.
- 6. A community of species that does not develop to a natural climatic climax community, but is maintained by external influences which prevent this, including human activities such as burning, grazing or ploughing.
- 8. An organism that thrives in conditions with a high salt concentration.
- 10. The process of creating habitats that are similar to the conditions present before the natural habitat was changed by human actions.
- 12. The release of animals from captivity where they are provided with post-release support such as
- 13. Hedgerows and rows of trees that reduce wind velocity to reduce soil erosion.
- 15. DNA detected in environmental samples such as water or soil that is used to confirm the presence of the species that produced