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8 d ecological relationships
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8 d ecological relationships

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  • 1. 27/03/13Ecological Relationships Please note – some of the animation effects used here only work in PP XP
  • 2. Ecosystems 27/03/13“Ecosystem” is a term used to describe all of the organismsliving together as a community in a particular habitat.Ecosystems are constantly changing: Changes in Physical changes population due (e.g. temperature to predation, change) disease etc Changes in ecosystems Pollution Human interference Changes in soil conditions
  • 3. Classification of Plants 27/03/13We all know that there are many different types of plants, sohow do we classify them?
  • 4. Taking samples of an ecosystem 27/03/13Using different “sampling techniques” we can measure changes in an ecosystem. The two main measurements are:1) The physical conditions of a habitat (temperature etc)2) The populations of different species in that habitat Some common ways of measuring… Help! Measuring Taking animal Taking samplestemp, pH etc samples using quadrats
  • 5. Food chains 27/03/13A food chain shows where the energy goes in a food chain (inother words, “what gets eaten by what”): Cabbage Rabbit Stoat Fox Plants convert the The arrows indicate where sun’s energy into food the energy is going
  • 6. Pyramids of number 27/03/13In this food chain we can see that the number of organisms ineach stage is less than in the previous stage: Cabbage Rabbit Stoat FoxWe can draw a “Pyramid of Numbers” to show this pattern: One fox A few stoats Some rabbits Lots of cabbages
  • 7. “Funny looking” pyramids 27/03/13Consider this food chain instead: Tree Greenfly Ladybird Bird One bird Some ladybirds Many greenfly ONE tree