Factors Affecting Biodiversity
- Created by: Laaauren
- Created on: 06-11-16 20:34
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- Factors Affecting Biodiversity
- Size and Age of an Area
- BD increases in wider, undisturbed area and encourage migration
- TRF has been in Brazil for millions of years. 30x the size of the UK
- Isolation
- Reduces BD and encourages endemism
- Galapagos Island 600 miles off Equador. High ED. 80% Birds 97% reptiles 30% plant
- Interaction between Species
- Leads to competition, could cause extinction if new species is introduced
- Dodo became extinct due to domestic animals eating eggs in Mauritious
- Regional Factors (Altitude)
- Valley floor to high mountains means higher BD as a variety of climates
- Himalayas high BD 10,000 plant species 300 mammals 977 birds
- Colonisation and Successes
- High speed colonisation increases BD
- Krakatoa 1883, life wiped out, 3yrs later 26 species came back (plants and birds)
- Natural Events
- Environment-al disasters (fire, floods, storms) reduce BD
- Mt St Helens eruption 1980 wiped out trees within 6 mile radius. 150sq miles destroyed instantly
- Habitat and Agriculture
- Complex ecosystems increase BD
- TRF contains layers, lower layers contain deterivores. Top layers contain birds and monkeys
- Climate
- Long sun hours, rain and high temp are optimum as things grow quicker
- TRF have optimum conditions so contain 50% of world's plants, 3% of world's surface. Arctic 60 days, less BD (40%)
- Human Intervention
- Habitat destruction and degradation lowers BD
- Since 2000, 20 football ptches of Amazon destryoed every min. 132,000 protected areas, 13% of land 2% of ocean
- Size and Age of an Area
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