Energy transfer
- Created by: emma
- Created on: 20-11-14 23:24
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- Energy Transfer
- Food chain
- Transfer of energy along trophic levels
- Producer- start food chain
- autotrophic, build organic compounds from simple molecules, photosynthetic
- Consumer- primary, secondary, tertiary
- Heterotrophic, rely on external source of organic comounds
- Usually only 4 trophic levels as energy is lost at each level so it wouldn't be efficent
- Decomposers- Break down organic compounds in dead organisms
- Food Web
- Shows energy transfer in ecosystem
- Still arranged in trophic levels
- More complex and diverse web, more stable ecosystem
- Change in one part of web won't greatly effect other parts
- Energy loss
- Sun to producer- only 1-3% sun energy trapped in photosynthesis
- Some light reflected, some misses chlorophyll, some wrong wavelength, some absorbed by atmosphere
- Producer to 1 consumer
- Not all plant digestible, Not all plant eaten, some energy lost to respiration, some energy lost to excretion
- 1 consumer to 2 consumer
- Not all animal is eaten, not all animal digestible, some energy lost to respiration or excretion
- NP= GP - R
- NP- net productivity, energy stored as new biomass, available to next trophic level
- GP- Gross productivity, energy which is converted to organic molecules
- Respiratory losses
- Sun to producer- only 1-3% sun energy trapped in photosynthesis
- Pyramids
- Energy
- Energy utilized at each trophic level in area at specific time
- Kjm-2 year-1
- Energy utilized at each trophic level in area at specific time
- Number
- No of each organism at each level
- Can be inverted if one tree or lots of parasites, difficult to draw to scale
- No of each organism at each level
- Biomas
- Actual biomass of organisms at each level
- Must be dry mass to be reliable (dead), seasons bring sudden increase in reproduction
- Actual biomass of organisms at each level
- Energy
- Food chain
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