Ecosystems and energy transfer
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?- Created by: vezting
- Created on: 23-04-16 16:39
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- ecosystems and energy transfer
- key words
- productivity: the rate at which energy passes through each trophic level in a food chain.
- gorss primary productivity: rate at which plants convert light energy to chemical energy
- ecosystem: is any group of living and non-living things occuring together and the interrelationships between them
- habitat: place where and organsim lives
- population: all the organisms of one species that live in the same place at the same time and can breed together
- community: is all the populations of different species that live in the same place and can interract with each other
- niche: the role each species has in an ecosystem
- food chains and webs
- ecosystems are dynamic as they are affected by biotic and abiotic factors
- a food chain shows the nergy transfer from one living organism to another
- arrows in food chains show the transfer of energy
- food webs are the interraction of food chains
- energy transfer
- in each tropic level energy is lost. energy is released in respiration, and energy remains stored in dead animals
- a pyramid of number represents the idea that there is less energy up the food chain which means less can be kept alive
- Eg 100 blades of grass, 50 rabbits, 25 foxes
- a pyramid of biomass can be represented by dry mass.
- organisms are baked at 80degrees and dry mass are weighed
- but some organisms release different energy per limit mass
- organisms are baked at 80degrees and dry mass are weighed
- pyramid of energy: burning organisma nd usin calirometre
- work out heat released per gram
- key words
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