8 d ecological relationships
Post on 11-May-2015
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12/04/23
Ecological Ecological RelationshipsRelationships
Please note – some of the animation effects used here only work in PP XP
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EcosystemsEcosystems“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
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Classification of PlantsClassification of PlantsWe all know that there are many different types of plants, so how do we classify them?
12/04/23Taking samples of an Taking samples of an ecosystemecosystem
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 habitatSome common ways of measuring…
Measuring temp, pH
etc
Taking animal samples
Help!
Taking samples using
quadrats
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Food chainsFood 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
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Pyramids of numberPyramids of numberIn 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
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““Funny looking” pyramidsFunny looking” pyramidsConsider this food chain instead:
Tree Greenfly Ladybird
Bird
ONE tree
Many greenfly
Some ladybirds
One bird
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