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Humans: A Damaging Influence

Humans: A Damaging Influence. Wetlands. Act as sponges – absorb excess water, filter water Crucial for birds – migration. Wetlands. Being destroyed by industry, agriculture, housing Burns Bog – dumping ground for Vancouver. Mangroves. Unique trees – live in salt water!

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Humans: A Damaging Influence

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  1. Humans: A Damaging Influence

  2. Wetlands • Act as sponges – absorb excess water, filter water • Crucial for birds – migration

  3. Wetlands • Being destroyed by industry, agriculture, housing • Burns Bog – dumping ground for Vancouver

  4. Mangroves • Unique trees – live in salt water! • Good for juvenile fish • Shoreline protection

  5. Mangroves • Cut down for urban development and aquaculture • Puts many species at risk for extinction (crocodiles, turtles, snakes, etc)

  6. Coral Reef • Help break the force of wind and waves

  7. Coral Reef • Humans love dynamite and blowing things up – coral reef blown up for shipping lanes or fishing

  8. Coral Reef

  9. Coral Reef • Coastal development, coral mining, oil spills, silty runoff from deforested hillside

  10. Coral Reef • “Global Warming” causing bleaching: • Coral sensitive to temperature change, when stressed releases an algae which helps keep it coloured

  11. Acceleration of Extinction • Extinction is natural – survival of the fittest • Humans speeding up the process

  12. Acceleration of Extinction • Destruction of tropical rainforest – biggest accelerant • Some developments – ex. wildlife corridors

  13. Chemicals & Farming • Farmers need to produce large quantities of food • Population up, food production up

  14. Chemicals & Farming • Overproduction of crops leading to infertile soil • Chemicals to enhance

  15. Chemicals & Farming • Smart: crop rotation • Not so smart: adding more chemicals

  16. Chemicals & Farming • Pesticides/herbicides kill both the good and bad • Then more chemicals to bring back the good!

  17. Chemicals & Farming • Dead zones

  18. South Okanagan Valley • Many rare plants and animals (tiger salamander, spadefoot toad) • “pocket desert”

  19. South Okanagan Valley • Wine festival getting bigger, need more vineland • Extirpation – becoming locally extinct

  20. Burrowing Owl • 1% of suitable habitat left • Agriculture, urban development, etc taking land

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