How humans threaten wildlife?

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  • How humans threaten Wildlife?
    • Unsustainable exploitation for human gain
      • Food - hunted & overexploited for food
        • dodo, passenger pigeon, cod, tuna
      • Fashion - collected/hunted
        • Crocodiles/ Alligators - Leather for bags/shoes Turtles - Shells for ornaments/ glasses frames Rhino - Horn for dagger handles Elephants - Ivory Wildcats - Fur coats
          • Snow leopard - threatened by habitat loss & loss of prey species. Main threat - hunting for their skins. A snow leopard coat would require 6-10 skins and worth £30,000 on the black market
      • Pets & entertainment
        • Tortoises, tropical fish, parrots, lizards, snakes
      • Traditional medicines
        • Tigers - claws as sedative, tail for skin diseases, dung for alcoholism. Snakes - arthritis & skin disease. Bear bile - fever & life disease.
    • Eradication of predators & competitors
      • Species that threaten humans - sharks, poisonous snakes
      • Predators that threaten livestock - wolves, lions, birds of prey
      • Agricultural pests - insects, fungi
      • Disease risks - malaria mosquito's, tsetse flies
      • pests in forestry plantations - deer, beavers
    • The Inability to survive habitat alteration
      • Unintentional deaths caused by human activities
        • Dolphins - by-catch of tuna fish. Animals in fields during crop harvesting, road kill
        • Introduced species
          • Predators - UK rivers: water voles killed  by American Mink that escaped from fur farms. Australia: many species threatened by cane toad that were introduced to control insects in cane sugar
          • Competitors - UK: grey squirrel introduced from North America, out competes the indigenous red squirrel as it's better at using food & carries squirrel pox that affects red squirrels
          • Disease - Europe & N America: Elm trees been killed by a fungus from Asia. UK: signal crayfish introduced from N America carried a disease that kills indigenous white-clawed crayfish
        • Changes in abiotic factors
          • Species of river plants - farming / mining may increase turbidity of a river = reduced light penetration so no photosynthesis
          • Crayfish & sensitive fish species: acid rain increases acidity of rivers & lakes. This can denature cell proteins & dissolve exoskeletons
      • Habitat Destruction
        • Deforestation - create farmland / exploit timber
        • Flooding caused by reservoir construction
        • Mining
        • Urbanisation
  • Furniture & Ornaments
    • Unsustainable exploitation for human gain
      • Food - hunted & overexploited for food
        • dodo, passenger pigeon, cod, tuna
      • Fashion - collected/hunted
        • Crocodiles/ Alligators - Leather for bags/shoes Turtles - Shells for ornaments/ glasses frames Rhino - Horn for dagger handles Elephants - Ivory Wildcats - Fur coats
          • Snow leopard - threatened by habitat loss & loss of prey species. Main threat - hunting for their skins. A snow leopard coat would require 6-10 skins and worth £30,000 on the black market
      • Pets & entertainment
        • Tortoises, tropical fish, parrots, lizards, snakes
      • Traditional medicines
        • Tigers - claws as sedative, tail for skin diseases, dung for alcoholism. Snakes - arthritis & skin disease. Bear bile - fever & life disease.
    • Mahogany & teak - furniture Ivory - White piano keys  Ebony wood - Black piano keys Coral & turtle / tortoise shells - jewellery

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