Direct And Indirect Drivers of Biodiversity


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A power point to practice working out whether the drivers that change biodiversity are direct or indirect, as described in the Millennium Ecosystem Assessment

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Direct And Indirect Drivers of Biodiversity

  1. 1. Drivers of change <ul><li>You need to understand the things that can lead to biodiversity loss or gain. A driver is any natural or human factor that directly or indirectly causes change. </li></ul><ul><li>You need to be able to tell the difference between direct and indirect drivers of change. Direct drivers directly affect ecosystems whereas indirect drivers alter the way the direct drivers work. </li></ul>
  2. 2. Is this a Direct driver (directly influencing the ecosystem), or Indirect driver (affects the way direct drivers work)? 1. Dams trap sediment in rivers and affect wetlands downstream
  3. 3. <ul><li>2. Invasive species out-compete endemic species on islands </li></ul><ul><li>3. Population of people rises and </li></ul><ul><li>there is greater demand for food </li></ul>
  4. 4. <ul><li>4. Belief in traditional Chinese medicine creates a huge demand for many animal products </li></ul><ul><li>5. Sea level rising floods coastal ecosystems, threatening salt marsh, mudflats and mangroves </li></ul>
  5. 5. <ul><li>6. Sewage outfalls and runoff from farming pollutes rivers causing eutrophication </li></ul><ul><li>7. Demand for biofuel causes removal of natural ecosystems to grow palm oil, sugar cane, etc. </li></ul>
  6. 6. <ul><li>8. Cultural and religious beliefs of people influence their consumption of natural resources </li></ul><ul><li>9. Population of people rises and </li></ul><ul><li>there is greater demand for food </li></ul>
  7. 7. <ul><li>10. Temperature increases caused by climate change have already affected species distribution, breeding and migrations </li></ul><ul><li>11. Deforestation causes removal of entire ecosystems </li></ul>
  8. 8. <ul><li>12. Education of local people and their involvement in planning will increase their commitment to conservation </li></ul><ul><li>13. Urban sprawl reduces space available for natural ecosystems </li></ul>
  9. 9. <ul><li>14. Global trade and fashion changes can create demand for products </li></ul><ul><li>15. Irrigation projects change the local environment causing a change to local ecosystems </li></ul>
  10. 10. <ul><li>16. Growing affluence increases demand for meat, fish, fruit and vegetables and reduces demand for staple food stuffs (eg rice, flour) </li></ul><ul><li>17. Volcanic eruptions wipe out habitats in the area and create new land for colonisation </li></ul>
  11. 11. <ul><li>18. Environmental concerns can reduce demand for natural resources </li></ul><ul><li>19. Laws and regulations can reduce demand for natural products, eg CITES which regulates the trade in products from endangered species. </li></ul>
  12. 12. <ul><li>20. Advances in fishing technology has had a major impact on the depletion of fish stocks </li></ul><ul><li>21. Introduced species can have a devastating effect on freshwater ecosystems </li></ul>
  13. 13. <ul><li>22. Diseases can be a major cause of extinctions </li></ul>