Section 2:  How Species Interact with Each Other

Chapter 8 Section 2 Presentation
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Key Terms:

• niche
• competition
• predation
• parasitism
• mutualism
• commensalism
• symbiosis

Main Ideas:

• The niche of an organism is its pattern of use of its habitat and its interactions with other organisms.
• Interactions between species are categorized based on the relative benefit or harm that one species causes the other.  The categories are competition, predation, parasitism, mutualism, and commensalism.
• Competition between species occurs when their niches overlap.  The competition may be direct or indirect.
• Pairs of species that have close relationships often evolve adaptations that either increase the benefit or reduce the harm from the relationship.