Edexcel A (SNAB) A Level Biology:复习笔记5.1.2 Biotic & Abiotic Factors

Biotic Factors

  • The abundance and distribution of a species within a habitat are determined by a combination of biotic and abiotic factors
  • Biotic factors are living factors that influence populations within their community; biotic factors come about as a result of the activity of other organisms e.g.
    • Predation
    • Food availability
    • Intraspecific competition, arising when individuals of the same species compete for resources
    • Interspecific competition, arising when individuals of different species compete for resources
    • Cooperation between organisms
    • Parasitism
    • Disease

The Impact of Biotic Factors on a Community Table

Abiotic Factors

  • Abiotic factors are non-living factors that influence populations within their community e.g.
    • Light intensity and wavelength
    • Temperature
    • Turbidity, or cloudiness, of water
    • Humidity
    • Soil or water pH
    • Soil or water salinity
    • Soil composition
    • Oxygen or Carbon dioxide concentration

The Impact of Abiotic Factors on a Community Table