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6.1 Relationships in the Ecosystem

6.1 Relationships in the Ecosystem. Predators and Prey. Predator= A consumer that actively hunts other living organisms. Prey= The organism that a predator eats . Lynx and Snowshoe Hare. Predator and prey population sizes are closely linked.

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6.1 Relationships in the Ecosystem

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  1. 6.1 Relationships in the Ecosystem

  2. Predators and Prey • Predator= A consumer that actively hunts other living organisms. • Prey= The organism that a predator eats.

  3. Lynx and Snowshoe Hare • Predator and prey population sizes are closely linked. • A large prey population can support more predators than a small prey population.

  4. Graph of Lynx and Hare • The changing population size of the prey species controls the population size of the predator species.

  5. Parasitism • Parasitism= Is a relationship in which one organism feeds on the tissues or body fluids of another. • Host= The organism on which a parasite feeds. • Parasites are a density-dependent limiting factor because parasites are more successful in dense host populations.

  6. Human Parasites

  7. Symbiosis • Symbiosis= Any relationship in which two species live closely together. • 2 types: Commensalism and Mutualism

  8. Commensalism • Is a symbiotic relationship that benefits one species and neither helps nor harms the other.

  9. Mutualism • A symbiotic relationship in which both species benefit.

  10. Review • What is a parasite? Provide an example of two human parasites. • Why are herbivores not considered to be parasites? • Explain symbiosis and the two different symbiotic relationships.

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