Abiotic/biotic factors

• Ecosystem


  The interaction between a community of living organisms (Biotic) and their environment (Abiotic)
• Community

  Two or more populations of organisms
• Population


  A group of organisms of the same or closely related species
• Abiotic factors

  • Light intensity
  • Temperature
  • Moisture levels
  • Soil pH
  • Soil minerals
  • Wind intensity
  • CO2 levels
  • Oxygen levels
• Increased light intensity


  Increased rate of photosynthesis, more growth
• Moisture levels


  Some plants thrive in high levels, others die
• Soil pH

  Some plants like acidic soils, others alkaline soils
• Soil minerals


  Plants require high levels to grow
• Sheltered conditions


  Preferred by many organisms
• More CO2


  More growth due to it being a reactant in photosynthesis
• Oxygen levels


  Aquatic animals need it to survive
• Interdependence


  Organisms in an ecosystem depend upon each other
• Factors affecting stable community


  • Availability of food
  • Predators
  • New pathogens
  • Competitive exclusion
• Competition in plants


  • For light, water, minerals, space
• Competition in animals


  • For food, mates, territory