abiotic and biotic factors

• • abiotic factors are non living factors which can affect a community
  • abiotic factors are:
  • light intensity
  • temperature
  • moisture level
  • soil pH and mineral content
  • wind intensity and direction
  • carbon dioxide level for plants
  • oxygen level for aquatic animals
• • biotic factors are living factors which can affect a community
  • biotic factors are:
  • new predators arriving
  • availability of food
  • new pathogens
  • competition - one species may outcompete another so the numbers are too low to breed
• • a change in environment can introduce a new biotic factor like a new predator or paathogen
  • the changes can also affect the size of populations in a community, which can have knock on effects because of interdependence