Maintaining Biodiversity (AQA GCSE Biology Combined Science): Revision Notes
📚 Revision Notes
7.3.6 Maintaining Biodiversity
infoNote
Human activities have both positive and negative impacts on ecosystems. Understanding these interactions is crucial for maintaining biodiversity.
| Positive Human Interactions | Negative Human Interactions |
|---|---|
| Maintaining rainforests: Protecting these critical habitats to prevent their destruction. | Greenhouse gas emissions: Contributing to global warming, which leads to habitat loss. |
| Reducing water pollution: Monitoring and minimising pollutants to protect aquatic ecosystems. | Acid rain: Caused by sulphur dioxide emissions from factories, damaging habitats. |
| Preserving areas of scientific interest: Restricting human access to protect sensitive ecosystems. | Chemical pollution from farming: Pesticides and fertilisers leach into the environment, harming wildlife. |
| Replanting hedgerows and woodlands: Restoring habitats that were previously destroyed. | Land clearance for development: Reducing the number of available habitats by building on natural land. |
Programs to Maintain Biodiversity
To mitigate our negative impact and preserve biodiversity, various conservation programmes have been implemented:
- Breeding Programs:
- Designed to prevent endangered species from becoming extinct by increasing their populations in controlled environments.
- Protection of Rare Habitats:
- Safeguarding habitats with unique species to prevent extinction. In some cases, damaged habitats are restored to support existing or reintroduced populations.
- Reintroduction of Hedgerows and Field Margins:
- Replanting hedgerows around agricultural land to create habitats for a variety of organisms. Field margins are left uncultivated to allow wildflowers and grasses to grow, supporting biodiversity in areas where monoculture (growing only one type of crop) would otherwise limit it.
- Reduction of Deforestation and Carbon Dioxide Production:
- Efforts to reduce deforestation and lower CO₂ emissions help slow down global warming, which in turn reduces the rate at which habitats are destroyed.
- Recycling:
- Encouraging recycling over landfill disposal decreases the amount of land required for waste, conserves natural resources, and reduces environmental pollution.