8 d ecological relationships (whs)

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Information about 8 d ecological relationships (whs)
Education

Published on March 31, 2014

Author: PreetiGhosh2

Source: slideshare.net

30/03/2014 Ecological Relationships Please note – some of the animation effects used here only work in PP XP

30/03/2014 Ecosystems “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 ecosystems Changes in population due to predation, disease etc Human interference Physical changes (e.g. temperature change) Pollution Changes in soil conditions

30/03/2014 Classification of Plants We all know that there are many different types of plants, so how do we classify them?

30/03/2014 Taking samples of an ecosystem 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… Measuring temp, pH etc Taking animal samples Help! Taking samples using quadrats

30/03/2014 Food chains A food chain shows where the energy goes in a food chain (in other words, “what gets eaten by what”): Cabbage Rabbit Stoat Fox The arrows indicate where the energy is going Plants convert the sun’s energy into food

30/03/2014 Pyramids of number 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: Lots of cabbages Some rabbits A few stoats One fox

30/03/2014 “Funny looking” pyramids Consider this food chain instead: Tree Greenfly Ladybird Bird ONE tree Many greenfly Some ladybirds One bird

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