Disruption to Ecosystems

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Presentation transcript:

Disruption to Ecosystems A2 Geography

Energy And Nutrients These two processes are fundamental to an ecosystem functioning properly

Energy Flows Primary producers at level 1 convert sunlight into energy via photosynthesis. Energy is lost through each respiration at each stage The amount of biomass at each level also decreases. Any change to this cycle can put the ecosystem under threat.

Nutrient Flows The circulation of chemical elements from the environment to organism and back to the environment again. Nutrients are stored as either soil, litter or Biomass This is easily affected as it is an OPEN SYSTEM and nutrients can be added physical or by human elements.

Precipitation Runoff Decay Pathway Fallout Pathway Weathering Litter Biomass Soil Precipitation Runoff Decay Pathway Fallout Pathway Weathering Uptake Pathway Leaching

Activity Draw a nutrient flow diagram like you have seen but this time give examples of each stage and explain how it works.

Movement of Species As we have traversed the world species have been moved both knowingly and unknowingly They can pose a threat to the native ecosystem Along with that many species become invasive along with other problems

Activity Think of 3 different animal or plant species within the UK that are alien species? Grey Squirrel Sycamore Japanese Knotweed

Alien Species share several features Enhanced Survival rates Lack native predator Not as susceptible to disease This means that they are often very difficult to control

VIDEO: Cane Toads: An Unnatural History Why Is This Important? The reason behind the introduction of cane toads to Australia was well intended but the results were unimagined. This is a good example of the fallibility of scientists and what can happen when an exotic species invades an ecosystem. Also, this is one of the most hilarious “educational videos” ever produced. Enjoy! Remember!

Answer the questions provided!