Study Notes
Human activities significantly impact ecosystems, leading to biodiversity loss and ecosystem degradation. Tropical rainforests and Antarctica are particularly affected by deforestation, resource exploitation, and climate change.
- Deforestation — the permanent removal of forest cover for agriculture or urban development.
Example: Clearing forests for cattle ranching. - Fragmentation — breaking up of habitats into smaller, isolated patches.
Example: Roads cutting through forests. - Subsistence Farming — small-scale agriculture for family use, often leading to soil depletion.
Example: Shifting cultivation in tropical regions. - Commercial Plantations — large-scale monocultures replacing diverse ecosystems.
Example: Oil palm plantations in Southeast Asia. - Mineral Extraction — removal of minerals causing habitat destruction and pollution.
Example: Gold mining in the Amazon. - Sustainable Harvesting — extracting resources at a rate that allows natural regeneration.
Example: Selective logging in managed forests. - Debt-For-Nature Swap — financial arrangement where debt is forgiven in exchange for conservation efforts.
Example: Funding national parks in exchange for debt relief. - Antarctic Treaty — agreement to protect Antarctica for peace and science.
Example: Prohibiting military activities and mineral extraction.
Exam Tips
Key Definitions to Remember
- Deforestation
- Fragmentation
- Sustainable Harvesting
- Antarctic Treaty
Common Confusions
- Confusing subsistence farming with commercial agriculture
- Misunderstanding the role of international agreements in conservation
Typical Exam Questions
- What is deforestation?
The permanent removal of forest cover for other land uses. - How does fragmentation affect biodiversity?
It isolates populations and reduces gene flow. - What is the purpose of the Antarctic Treaty?
To protect Antarctica for peaceful and scientific purposes.
What Examiners Usually Test
- Understanding of human impacts on ecosystems
- Knowledge of conservation strategies and their effectiveness
- Ability to explain the importance of international cooperation in environmental protection