biotic factors and communites

• Competition:

  • Interspecific (different)

  • Intraspecific (same)
• Competition:

  • Plants & algae — light, space, water and soil nutrients.

  • Animals — food, mates and territory
• 1. Number of predators increase because of more prey — eat & reproduce.
  2. Number of prey reduced because more predators — eaten.
  3. Number of predators decreased because less prey — less food & competition.
• Ecosystems with high biodiversity are more stable as they can adjust to changes easily. Also:

  • Help maintain important biological resources — medicine and food.

  • Recreation and tourism — provides income.