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ECOSYSTEM a natural environment and includes the flora (plants) and…

- - - - Availability of food and competition for food resources
      - Predation
      - Parasitism
      - Disease
      - Presence of pollinating insects
      - Availability of nest sites
      - Factors
  - - - Climate
        
        Light intensity, temperature, water availability
      - Hours of daylight
      - Soil conditions
        
        clay content, nitrate level, particle size, water content and PH
      - Habitat
        
        salt content in an estuary
        
        Flow rate in a river
        
        oxygen concentration in a lake
      - Factors
- - - - The food web of the salmon. The young salmon have a slightly different diet to mature salmon