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Cane toads (Kakadu national park (Biotic (toxicity (Spreading into…

- - - - Toads depend on the humidity
      - Can't survive arid places
  - - - lay up to 30,000 eggs
    - - Spreading into waterways
      - Contaminating water
    - - Can't die from pathogens
    - - Make use of a varierty of different resources
    - - Energy to growth and reproduce
  - - - impacts
        
        Toxic at all stages
        
        potential for spread of disease
        
        Eats all the food
        
        No food left for native animals #
        
        Invasive species
        
        Spread faster and quicker
        
        Some had stronger legs
        
        Habitat degradation
        
        Reduced amount of water
        
        Reduced quality of water
        
        altering ecosystem function
        
        direct predation on native fauna
        
        predator kills and eats another animal
      - Native animals
        
        Northern Quoll
        
        cane toads consumed
        
        Leads to death
        
        had be monitored and trained for 8 months
        
        then let out to the wild
        
        got moved to islands away from Toads
        
        Quolls trained
        
        Given toad sausages
        
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        fresh-water crocodiles
        
        Eat cane toads
        
        The crocodile will die
        
        Population will change #
        
        Red bellied snake
        
        the snake eats the cane toad
        
        snake with larger heads die
        
        overtime traits developed: Smaller head snakes survived
        
        to eat smaller toad
        
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- - - - No reproduction
        
        phenotype dies out
        
        This phenotype slowly dies out
    - - Reproduction
        
        Advantage phenotype reproduces
        
        This phenotype lives on
        
        Population changes #
    - - Colour of eyes
      - Skin colour
      - Long neck
  - - - Temperature
        
        Global warming
        
        Cane toads being able to reach colder areas
      - Weather
      - Geographical access
    - - Predators
      - Pathogens
    - - Presence of food
      - Habitat
      - Mates
  - - - Predators die if injested
        
        Northern quoll
        
        Toad sausages were introduced
        
        Quoll got sick
        
        Knows not to eat it again
        
        red bellied snake
        
        Smaller heads survived
        
        Prevent from larger toads
        
        Larger have more toxin
        
        Smaller toads have less toxin
        
        Fresh-water crocodiles
        
        Eats large cane toads
        
        Toxin kills the crocodile
        
        Drop in population
    - - Stronger legs
        
        Faster spread
        
        10-60 km a year
      - Hopping style improved
        
        More effiecient
- - - - 102 cane toads
        
        Fast reproduction
        
        200+ millions
        
        Fast life cycle
- - - - 1935 north-eastern Australia
        
        102 were released
        
        to kill beetles
        
        failed
        
        spreading west of Australia
        
        Slowly becaming a invasive species
        
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