8 d ecological relationships


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8 d ecological relationships

  1. 1. 27/03/13Ecological Relationships Please note – some of the animation effects used here only work in PP XP
  2. 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. 3. Classification of Plants 27/03/13We all know that there are many different types of plants, sohow do we classify them?
  4. 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. 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. 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. 7. “Funny looking” pyramids 27/03/13Consider this food chain instead: Tree Greenfly Ladybird Bird One bird Some ladybirds Many greenfly ONE tree