SALVE 1%

 

 
 
 
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Wildlife Ecology and Management> Energy Flow and Nutrient Cycles > lecture notes
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Page written by: peter kabai 
 
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Energy flows one-way
 
 

Trophic levels:
(Trophos = "feeder", food chain )

(1) Producers (autotrophs)
(2) Primary consumers
(3) Secondary consumers
(4) Tertiary consumers
Detritivores

Primary productivity
1-5% of solar energy is bond
NPP: produced by heterotrophs

Productivity in bioms (click on thumbnail)
 
 

Why only four levels?

70-90 % of energy is lost at each level
0.1% energy reaches last level
Such a system cannot support extra levels
 
 
 
 

slide show, pdf file

    
  News    
 
  • Citizen science 'can safeguard birds' future' BBC
  • BBC: S Africa to allow elephant cull
    The South African government has said it will allow elephants to be culled for the first time in 13 years.
    The elephant population is thought to have grown from 8,000 to 18,000 since the government banned culls in 1995.
    http://news.bbc.co.uk/1/hi/world/africa/7262951.stm
   
       
  Video    
 

John Kasaona: How poachers became caretakers TED talk

    
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