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Transcript
22/05/2017 Ecological Relationships W Richards The Weald School Ecosystems 22/05/2017 “Ecosystem” is a term used to describe all of the organisms living together as a community in a particular habitat. Ecosystems are constantly changing: Changes in population due to predation, disease etc Physical changes (e.g. temperature change) Changes in ecosystems Pollution Human interference Changes in soil conditions Taking samples of an ecosystem 22/05/2017 Using 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 temp, pH etc Taking animal samples Taking samples using quadrats Food chains 22/05/2017 A food chain shows where the energy goes in a food chain (in other words, “what gets eaten by what”): Cabbage Rabbit Plants convert the sun’s energy into food Stoat Fox The arrows indicate where the energy is going Pyramids of number 22/05/2017 In this food chain we can see that the number of organisms in each stage is less than in the previous stage: Cabbage Rabbit Stoat Fox We can draw a “Pyramid of Numbers” to show this pattern: One fox A few stoats Some rabbits Lots of cabbages “Funny looking” pyramids 22/05/2017 Consider this food chain instead: Tree Greenfly Ladybird One bird Some ladybirds Many greenfly ONE tree Bird