OCR AS Level Biology Biodiversity

HideShow resource information
  • Created by: Sorcha
  • Created on: 08-04-13 14:14
View mindmap
  • Biodiversity -the number or variety of genes in different species
    • Conservation - a process which maintains biodiversity
      • WHY?!
        • Practical
          • Global interdependence of ecosystems
        • Economic
          • Potential for drug and pharmaceuticals
          • Genetic diversity and disease resistance
          • Eco-tourism e.g. Safari's
        • Ethical/ Aesthetic
          • Moral case for conservation
      • IN-SITU - conserving in an are where the organism is naturally present
          • Creates Conflict... boundaries may not be respected
          • Reserves need to be large if not can reduce gene pools and reduce diversity
        • AVANTAGES
          • Promotes Research
          • permanently protects biodiversity
          • Control or balances conflicting use: farming, traditional use/hunting
      • EX-SITU conserving outside of the area when the organism naturally lives
        • ADVANTAGES
          • Protected: safe environment,food supplied, healthcare
          • Possible increase genetic base: IVF
          • Allows time for recovery of habitat, setting up reserve
          • Some plants breed only sporadically
          • Animals may fail to breed.
          • Reintroduction to the wild may fail, Zoos are a safe environment, animals haven't learnt survival skills
    • Threats to biodiversity
      • OVER-EXPLOITATION  e.g. whaling, fishing
      • HABITAT DESTRUCTION e.g. deforestation
      • COMPETITION from introduced species e.g. grey vs red squirrels
    • The Importance of Genetic Diversity
      • Affected by a decrease in species number
      • A low genetic diversity means ... a narrow gene pool and limited range of different Alleles
      • Less genetic variation reduces the ability for a species to EVOLVE
      • this means existing species cannot adapt successfully  to environmental change


No comments have yet been made

Similar Biology resources:

See all Biology resources »